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using System; using System.Text; using System.Collections; using System.Collections.Generic; using System.Diagnostics.Contracts; using System.Runtime.CompilerServices; namespace System { /// <summary> /// Helper so we can call some tuple methods recursively without knowing the underlying types. /// </summary> internal interface ITupleInternal : ITuple { string ToString(StringBuilder sb); int GetHashCode(IEqualityComparer comparer); } public static class Tuple { public static Tuple<T1> Create<T1>(T1 item1) { return new Tuple<T1>(item1); } public static Tuple<T1, T2> Create<T1, T2>(T1 item1, T2 item2) { return new Tuple<T1, T2>(item1, item2); } public static Tuple<T1, T2, T3> Create<T1, T2, T3>(T1 item1, T2 item2, T3 item3) { return new Tuple<T1, T2, T3>(item1, item2, item3); } public static Tuple<T1, T2, T3, T4> Create<T1, T2, T3, T4>(T1 item1, T2 item2, T3 item3, T4 item4) { return new Tuple<T1, T2, T3, T4>(item1, item2, item3, item4); } public static Tuple<T1, T2, T3, T4, T5> Create<T1, T2, T3, T4, T5>(T1 item1, T2 item2, T3 item3, T4 item4, T5 item5) { return new Tuple<T1, T2, T3, T4, T5>(item1, item2, item3, item4, item5); } public static Tuple<T1, T2, T3, T4, T5, T6> Create<T1, T2, T3, T4, T5, T6>(T1 item1, T2 item2, T3 item3, T4 item4, T5 item5, T6 item6) { return new Tuple<T1, T2, T3, T4, T5, T6>(item1, item2, item3, item4, item5, item6); } public static Tuple<T1, T2, T3, T4, T5, T6, T7> Create<T1, T2, T3, T4, T5, T6, T7>(T1 item1, T2 item2, T3 item3, T4 item4, T5 item5, T6 item6, T7 item7) { return new Tuple<T1, T2, T3, T4, T5, T6, T7>(item1, item2, item3, item4, item5, item6, item7); } public static Tuple<T1, T2, T3, T4, T5, T6, T7, Tuple<T8>> Create<T1, T2, T3, T4, T5, T6, T7, T8>(T1 item1, T2 item2, T3 item3, T4 item4, T5 item5, T6 item6, T7 item7, T8 item8) { return new Tuple<T1, T2, T3, T4, T5, T6, T7, Tuple<T8>>(item1, item2, item3, item4, item5, item6, item7, new Tuple<T8>(item8)); } // From System.Web.Util.HashCodeCombiner internal static int CombineHashCodes(int h1, int h2) { return (((h1 << 5) + h1) ^ h2); } internal static int CombineHashCodes(int h1, int h2, int h3) { return CombineHashCodes(CombineHashCodes(h1, h2), h3); } internal static int CombineHashCodes(int h1, int h2, int h3, int h4) { return CombineHashCodes(CombineHashCodes(h1, h2), CombineHashCodes(h3, h4)); } internal static int CombineHashCodes(int h1, int h2, int h3, int h4, int h5) { return CombineHashCodes(CombineHashCodes(h1, h2, h3, h4), h5); } internal static int CombineHashCodes(int h1, int h2, int h3, int h4, int h5, int h6) { return CombineHashCodes(CombineHashCodes(h1, h2, h3, h4), CombineHashCodes(h5, h6)); } internal static int CombineHashCodes(int h1, int h2, int h3, int h4, int h5, int h6, int h7) { return CombineHashCodes(CombineHashCodes(h1, h2, h3, h4), CombineHashCodes(h5, h6, h7)); } internal static int CombineHashCodes(int h1, int h2, int h3, int h4, int h5, int h6, int h7, int h8) { return CombineHashCodes(CombineHashCodes(h1, h2, h3, h4), CombineHashCodes(h5, h6, h7, h8)); } } [Serializable] public class Tuple<T1> : IStructuralEquatable, IStructuralComparable, IComparable, ITupleInternal, ITuple { private readonly T1 m_Item1; public T1 Item1 { get { return m_Item1; } } public Tuple(T1 item1) { m_Item1 = item1; } public override Boolean Equals(Object obj) { return ((IStructuralEquatable) this).Equals(obj, EqualityComparer<Object>.Default); } Boolean IStructuralEquatable.Equals(Object other, IEqualityComparer comparer) { if (other == null) return false; Tuple<T1> objTuple = other as Tuple<T1>; if (objTuple == null) { return false; } return comparer.Equals(m_Item1, objTuple.m_Item1); } Int32 IComparable.CompareTo(Object obj) { return ((IStructuralComparable) this).CompareTo(obj, Comparer<Object>.Default); } Int32 IStructuralComparable.CompareTo(Object other, IComparer comparer) { if (other == null) return 1; Tuple<T1> objTuple = other as Tuple<T1>; if (objTuple == null) { throw new ArgumentException(Environment.GetResourceString("ArgumentException_TupleIncorrectType", this.GetType().ToString()), "other"); } return comparer.Compare(m_Item1, objTuple.m_Item1); } public override int GetHashCode() { return ((IStructuralEquatable) this).GetHashCode(EqualityComparer<Object>.Default); } Int32 IStructuralEquatable.GetHashCode(IEqualityComparer comparer) { return comparer.GetHashCode(m_Item1); } Int32 ITupleInternal.GetHashCode(IEqualityComparer comparer) { return ((IStructuralEquatable) this).GetHashCode(comparer); } public override string ToString() { StringBuilder sb = new StringBuilder(); sb.Append("("); return ((ITupleInternal)this).ToString(sb); } string ITupleInternal.ToString(StringBuilder sb) { sb.Append(m_Item1); sb.Append(")"); return sb.ToString(); } /// <summary> /// The number of positions in this data structure. /// </summary> int ITuple.Length => 1; /// <summary> /// Get the element at position <param name="index"/>. /// </summary> object ITuple.this[int index] { get { if (index != 0) { throw new IndexOutOfRangeException(); } return Item1; } } } [Serializable] public class Tuple<T1, T2> : IStructuralEquatable, IStructuralComparable, IComparable, ITupleInternal, ITuple { private readonly T1 m_Item1; private readonly T2 m_Item2; public T1 Item1 { get { return m_Item1; } } public T2 Item2 { get { return m_Item2; } } public Tuple(T1 item1, T2 item2) { m_Item1 = item1; m_Item2 = item2; } public override Boolean Equals(Object obj) { return ((IStructuralEquatable) this).Equals(obj, EqualityComparer<Object>.Default);; } Boolean IStructuralEquatable.Equals(Object other, IEqualityComparer comparer) { if (other == null) return false; Tuple<T1, T2> objTuple = other as Tuple<T1, T2>; if (objTuple == null) { return false; } return comparer.Equals(m_Item1, objTuple.m_Item1) && comparer.Equals(m_Item2, objTuple.m_Item2); } Int32 IComparable.CompareTo(Object obj) { return ((IStructuralComparable) this).CompareTo(obj, Comparer<Object>.Default); } Int32 IStructuralComparable.CompareTo(Object other, IComparer comparer) { if (other == null) return 1; Tuple<T1, T2> objTuple = other as Tuple<T1, T2>; if (objTuple == null) { throw new ArgumentException(Environment.GetResourceString("ArgumentException_TupleIncorrectType", this.GetType().ToString()), "other"); } int c = 0; c = comparer.Compare(m_Item1, objTuple.m_Item1); if (c != 0) return c; return comparer.Compare(m_Item2, objTuple.m_Item2); } public override int GetHashCode() { return ((IStructuralEquatable) this).GetHashCode(EqualityComparer<Object>.Default); } Int32 IStructuralEquatable.GetHashCode(IEqualityComparer comparer) { return Tuple.CombineHashCodes(comparer.GetHashCode(m_Item1), comparer.GetHashCode(m_Item2)); } Int32 ITupleInternal.GetHashCode(IEqualityComparer comparer) { return ((IStructuralEquatable) this).GetHashCode(comparer); } public override string ToString() { StringBuilder sb = new StringBuilder(); sb.Append("("); return ((ITupleInternal)this).ToString(sb); } string ITupleInternal.ToString(StringBuilder sb) { sb.Append(m_Item1); sb.Append(", "); sb.Append(m_Item2); sb.Append(")"); return sb.ToString(); } /// <summary> /// The number of positions in this data structure. /// </summary> int ITuple.Length => 2; /// <summary> /// Get the element at position <param name="index"/>. /// </summary> object ITuple.this[int index] { get { switch (index) { case 0: return Item1; case 1: return Item2; default: throw new IndexOutOfRangeException(); } } } } [Serializable] public class Tuple<T1, T2, T3> : IStructuralEquatable, IStructuralComparable, IComparable, ITupleInternal, ITuple { private readonly T1 m_Item1; private readonly T2 m_Item2; private readonly T3 m_Item3; public T1 Item1 { get { return m_Item1; } } public T2 Item2 { get { return m_Item2; } } public T3 Item3 { get { return m_Item3; } } public Tuple(T1 item1, T2 item2, T3 item3) { m_Item1 = item1; m_Item2 = item2; m_Item3 = item3; } public override Boolean Equals(Object obj) { return ((IStructuralEquatable) this).Equals(obj, EqualityComparer<Object>.Default);; } Boolean IStructuralEquatable.Equals(Object other, IEqualityComparer comparer) { if (other == null) return false; Tuple<T1, T2, T3> objTuple = other as Tuple<T1, T2, T3>; if (objTuple == null) { return false; } return comparer.Equals(m_Item1, objTuple.m_Item1) && comparer.Equals(m_Item2, objTuple.m_Item2) && comparer.Equals(m_Item3, objTuple.m_Item3); } Int32 IComparable.CompareTo(Object obj) { return ((IStructuralComparable) this).CompareTo(obj, Comparer<Object>.Default); } Int32 IStructuralComparable.CompareTo(Object other, IComparer comparer) { if (other == null) return 1; Tuple<T1, T2, T3> objTuple = other as Tuple<T1, T2, T3>; if (objTuple == null) { throw new ArgumentException(Environment.GetResourceString("ArgumentException_TupleIncorrectType", this.GetType().ToString()), "other"); } int c = 0; c = comparer.Compare(m_Item1, objTuple.m_Item1); if (c != 0) return c; c = comparer.Compare(m_Item2, objTuple.m_Item2); if (c != 0) return c; return comparer.Compare(m_Item3, objTuple.m_Item3); } public override int GetHashCode() { return ((IStructuralEquatable) this).GetHashCode(EqualityComparer<Object>.Default); } Int32 IStructuralEquatable.GetHashCode(IEqualityComparer comparer) { return Tuple.CombineHashCodes(comparer.GetHashCode(m_Item1), comparer.GetHashCode(m_Item2), comparer.GetHashCode(m_Item3)); } Int32 ITupleInternal.GetHashCode(IEqualityComparer comparer) { return ((IStructuralEquatable) this).GetHashCode(comparer); } public override string ToString() { StringBuilder sb = new StringBuilder(); sb.Append("("); return ((ITupleInternal)this).ToString(sb); } string ITupleInternal.ToString(StringBuilder sb) { sb.Append(m_Item1); sb.Append(", "); sb.Append(m_Item2); sb.Append(", "); sb.Append(m_Item3); sb.Append(")"); return sb.ToString(); } /// <summary> /// The number of positions in this data structure. /// </summary> int ITuple.Length => 3; /// <summary> /// Get the element at position <param name="index"/>. /// </summary> object ITuple.this[int index] { get { switch (index) { case 0: return Item1; case 1: return Item2; case 2: return Item3; default: throw new IndexOutOfRangeException(); } } } } [Serializable] public class Tuple<T1, T2, T3, T4> : IStructuralEquatable, IStructuralComparable, IComparable, ITupleInternal, ITuple { private readonly T1 m_Item1; private readonly T2 m_Item2; private readonly T3 m_Item3; private readonly T4 m_Item4; public T1 Item1 { get { return m_Item1; } } public T2 Item2 { get { return m_Item2; } } public T3 Item3 { get { return m_Item3; } } public T4 Item4 { get { return m_Item4; } } public Tuple(T1 item1, T2 item2, T3 item3, T4 item4) { m_Item1 = item1; m_Item2 = item2; m_Item3 = item3; m_Item4 = item4; } public override Boolean Equals(Object obj) { return ((IStructuralEquatable) this).Equals(obj, EqualityComparer<Object>.Default);; } Boolean IStructuralEquatable.Equals(Object other, IEqualityComparer comparer) { if (other == null) return false; Tuple<T1, T2, T3, T4> objTuple = other as Tuple<T1, T2, T3, T4>; if (objTuple == null) { return false; } return comparer.Equals(m_Item1, objTuple.m_Item1) && comparer.Equals(m_Item2, objTuple.m_Item2) && comparer.Equals(m_Item3, objTuple.m_Item3) && comparer.Equals(m_Item4, objTuple.m_Item4); } Int32 IComparable.CompareTo(Object obj) { return ((IStructuralComparable) this).CompareTo(obj, Comparer<Object>.Default); } Int32 IStructuralComparable.CompareTo(Object other, IComparer comparer) { if (other == null) return 1; Tuple<T1, T2, T3, T4> objTuple = other as Tuple<T1, T2, T3, T4>; if (objTuple == null) { throw new ArgumentException(Environment.GetResourceString("ArgumentException_TupleIncorrectType", this.GetType().ToString()), "other"); } int c = 0; c = comparer.Compare(m_Item1, objTuple.m_Item1); if (c != 0) return c; c = comparer.Compare(m_Item2, objTuple.m_Item2); if (c != 0) return c; c = comparer.Compare(m_Item3, objTuple.m_Item3); if (c != 0) return c; return comparer.Compare(m_Item4, objTuple.m_Item4); } public override int GetHashCode() { return ((IStructuralEquatable) this).GetHashCode(EqualityComparer<Object>.Default); } Int32 IStructuralEquatable.GetHashCode(IEqualityComparer comparer) { return Tuple.CombineHashCodes(comparer.GetHashCode(m_Item1), comparer.GetHashCode(m_Item2), comparer.GetHashCode(m_Item3), comparer.GetHashCode(m_Item4)); } Int32 ITupleInternal.GetHashCode(IEqualityComparer comparer) { return ((IStructuralEquatable) this).GetHashCode(comparer); } public override string ToString() { StringBuilder sb = new StringBuilder(); sb.Append("("); return ((ITupleInternal)this).ToString(sb); } string ITupleInternal.ToString(StringBuilder sb) { sb.Append(m_Item1); sb.Append(", "); sb.Append(m_Item2); sb.Append(", "); sb.Append(m_Item3); sb.Append(", "); sb.Append(m_Item4); sb.Append(")"); return sb.ToString(); } /// <summary> /// The number of positions in this data structure. /// </summary> int ITuple.Length => 4; /// <summary> /// Get the element at position <param name="index"/>. /// </summary> object ITuple.this[int index] { get { switch (index) { case 0: return Item1; case 1: return Item2; case 2: return Item3; case 3: return Item4; default: throw new IndexOutOfRangeException(); } } } } [Serializable] public class Tuple<T1, T2, T3, T4, T5> : IStructuralEquatable, IStructuralComparable, IComparable, ITupleInternal, ITuple { private readonly T1 m_Item1; private readonly T2 m_Item2; private readonly T3 m_Item3; private readonly T4 m_Item4; private readonly T5 m_Item5; public T1 Item1 { get { return m_Item1; } } public T2 Item2 { get { return m_Item2; } } public T3 Item3 { get { return m_Item3; } } public T4 Item4 { get { return m_Item4; } } public T5 Item5 { get { return m_Item5; } } public Tuple(T1 item1, T2 item2, T3 item3, T4 item4, T5 item5) { m_Item1 = item1; m_Item2 = item2; m_Item3 = item3; m_Item4 = item4; m_Item5 = item5; } public override Boolean Equals(Object obj) { return ((IStructuralEquatable) this).Equals(obj, EqualityComparer<Object>.Default);; } Boolean IStructuralEquatable.Equals(Object other, IEqualityComparer comparer) { if (other == null) return false; Tuple<T1, T2, T3, T4, T5> objTuple = other as Tuple<T1, T2, T3, T4, T5>; if (objTuple == null) { return false; } return comparer.Equals(m_Item1, objTuple.m_Item1) && comparer.Equals(m_Item2, objTuple.m_Item2) && comparer.Equals(m_Item3, objTuple.m_Item3) && comparer.Equals(m_Item4, objTuple.m_Item4) && comparer.Equals(m_Item5, objTuple.m_Item5); } Int32 IComparable.CompareTo(Object obj) { return ((IStructuralComparable) this).CompareTo(obj, Comparer<Object>.Default); } Int32 IStructuralComparable.CompareTo(Object other, IComparer comparer) { if (other == null) return 1; Tuple<T1, T2, T3, T4, T5> objTuple = other as Tuple<T1, T2, T3, T4, T5>; if (objTuple == null) { throw new ArgumentException(Environment.GetResourceString("ArgumentException_TupleIncorrectType", this.GetType().ToString()), "other"); } int c = 0; c = comparer.Compare(m_Item1, objTuple.m_Item1); if (c != 0) return c; c = comparer.Compare(m_Item2, objTuple.m_Item2); if (c != 0) return c; c = comparer.Compare(m_Item3, objTuple.m_Item3); if (c != 0) return c; c = comparer.Compare(m_Item4, objTuple.m_Item4); if (c != 0) return c; return comparer.Compare(m_Item5, objTuple.m_Item5); } public override int GetHashCode() { return ((IStructuralEquatable) this).GetHashCode(EqualityComparer<Object>.Default); } Int32 IStructuralEquatable.GetHashCode(IEqualityComparer comparer) { return Tuple.CombineHashCodes(comparer.GetHashCode(m_Item1), comparer.GetHashCode(m_Item2), comparer.GetHashCode(m_Item3), comparer.GetHashCode(m_Item4), comparer.GetHashCode(m_Item5)); } Int32 ITupleInternal.GetHashCode(IEqualityComparer comparer) { return ((IStructuralEquatable) this).GetHashCode(comparer); } public override string ToString() { StringBuilder sb = new StringBuilder(); sb.Append("("); return ((ITupleInternal)this).ToString(sb); } string ITupleInternal.ToString(StringBuilder sb) { sb.Append(m_Item1); sb.Append(", "); sb.Append(m_Item2); sb.Append(", "); sb.Append(m_Item3); sb.Append(", "); sb.Append(m_Item4); sb.Append(", "); sb.Append(m_Item5); sb.Append(")"); return sb.ToString(); } /// <summary> /// The number of positions in this data structure. /// </summary> int ITuple.Length => 5; /// <summary> /// Get the element at position <param name="index"/>. /// </summary> object ITuple.this[int index] { get { switch (index) { case 0: return Item1; case 1: return Item2; case 2: return Item3; case 3: return Item4; case 4: return Item5; default: throw new IndexOutOfRangeException(); } } } } [Serializable] public class Tuple<T1, T2, T3, T4, T5, T6> : IStructuralEquatable, IStructuralComparable, IComparable, ITupleInternal, ITuple { private readonly T1 m_Item1; private readonly T2 m_Item2; private readonly T3 m_Item3; private readonly T4 m_Item4; private readonly T5 m_Item5; private readonly T6 m_Item6; public T1 Item1 { get { return m_Item1; } } public T2 Item2 { get { return m_Item2; } } public T3 Item3 { get { return m_Item3; } } public T4 Item4 { get { return m_Item4; } } public T5 Item5 { get { return m_Item5; } } public T6 Item6 { get { return m_Item6; } } public Tuple(T1 item1, T2 item2, T3 item3, T4 item4, T5 item5, T6 item6) { m_Item1 = item1; m_Item2 = item2; m_Item3 = item3; m_Item4 = item4; m_Item5 = item5; m_Item6 = item6; } public override Boolean Equals(Object obj) { return ((IStructuralEquatable) this).Equals(obj, EqualityComparer<Object>.Default);; } Boolean IStructuralEquatable.Equals(Object other, IEqualityComparer comparer) { if (other == null) return false; Tuple<T1, T2, T3, T4, T5, T6> objTuple = other as Tuple<T1, T2, T3, T4, T5, T6>; if (objTuple == null) { return false; } return comparer.Equals(m_Item1, objTuple.m_Item1) && comparer.Equals(m_Item2, objTuple.m_Item2) && comparer.Equals(m_Item3, objTuple.m_Item3) && comparer.Equals(m_Item4, objTuple.m_Item4) && comparer.Equals(m_Item5, objTuple.m_Item5) && comparer.Equals(m_Item6, objTuple.m_Item6); } Int32 IComparable.CompareTo(Object obj) { return ((IStructuralComparable) this).CompareTo(obj, Comparer<Object>.Default); } Int32 IStructuralComparable.CompareTo(Object other, IComparer comparer) { if (other == null) return 1; Tuple<T1, T2, T3, T4, T5, T6> objTuple = other as Tuple<T1, T2, T3, T4, T5, T6>; if (objTuple == null) { throw new ArgumentException(Environment.GetResourceString("ArgumentException_TupleIncorrectType", this.GetType().ToString()), "other"); } int c = 0; c = comparer.Compare(m_Item1, objTuple.m_Item1); if (c != 0) return c; c = comparer.Compare(m_Item2, objTuple.m_Item2); if (c != 0) return c; c = comparer.Compare(m_Item3, objTuple.m_Item3); if (c != 0) return c; c = comparer.Compare(m_Item4, objTuple.m_Item4); if (c != 0) return c; c = comparer.Compare(m_Item5, objTuple.m_Item5); if (c != 0) return c; return comparer.Compare(m_Item6, objTuple.m_Item6); } public override int GetHashCode() { return ((IStructuralEquatable) this).GetHashCode(EqualityComparer<Object>.Default); } Int32 IStructuralEquatable.GetHashCode(IEqualityComparer comparer) { return Tuple.CombineHashCodes(comparer.GetHashCode(m_Item1), comparer.GetHashCode(m_Item2), comparer.GetHashCode(m_Item3), comparer.GetHashCode(m_Item4), comparer.GetHashCode(m_Item5), comparer.GetHashCode(m_Item6)); } Int32 ITupleInternal.GetHashCode(IEqualityComparer comparer) { return ((IStructuralEquatable) this).GetHashCode(comparer); } public override string ToString() { StringBuilder sb = new StringBuilder(); sb.Append("("); return ((ITupleInternal)this).ToString(sb); } string ITupleInternal.ToString(StringBuilder sb) { sb.Append(m_Item1); sb.Append(", "); sb.Append(m_Item2); sb.Append(", "); sb.Append(m_Item3); sb.Append(", "); sb.Append(m_Item4); sb.Append(", "); sb.Append(m_Item5); sb.Append(", "); sb.Append(m_Item6); sb.Append(")"); return sb.ToString(); } /// <summary> /// The number of positions in this data structure. /// </summary> int ITuple.Length => 6; /// <summary> /// Get the element at position <param name="index"/>. /// </summary> object ITuple.this[int index] { get { switch (index) { case 0: return Item1; case 1: return Item2; case 2: return Item3; case 3: return Item4; case 4: return Item5; case 5: return Item6; default: throw new IndexOutOfRangeException(); } } } } [Serializable] public class Tuple<T1, T2, T3, T4, T5, T6, T7> : IStructuralEquatable, IStructuralComparable, IComparable, ITupleInternal, ITuple { private readonly T1 m_Item1; private readonly T2 m_Item2; private readonly T3 m_Item3; private readonly T4 m_Item4; private readonly T5 m_Item5; private readonly T6 m_Item6; private readonly T7 m_Item7; public T1 Item1 { get { return m_Item1; } } public T2 Item2 { get { return m_Item2; } } public T3 Item3 { get { return m_Item3; } } public T4 Item4 { get { return m_Item4; } } public T5 Item5 { get { return m_Item5; } } public T6 Item6 { get { return m_Item6; } } public T7 Item7 { get { return m_Item7; } } public Tuple(T1 item1, T2 item2, T3 item3, T4 item4, T5 item5, T6 item6, T7 item7) { m_Item1 = item1; m_Item2 = item2; m_Item3 = item3; m_Item4 = item4; m_Item5 = item5; m_Item6 = item6; m_Item7 = item7; } public override Boolean Equals(Object obj) { return ((IStructuralEquatable) this).Equals(obj, EqualityComparer<Object>.Default);; } Boolean IStructuralEquatable.Equals(Object other, IEqualityComparer comparer) { if (other == null) return false; Tuple<T1, T2, T3, T4, T5, T6, T7> objTuple = other as Tuple<T1, T2, T3, T4, T5, T6, T7>; if (objTuple == null) { return false; } return comparer.Equals(m_Item1, objTuple.m_Item1) && comparer.Equals(m_Item2, objTuple.m_Item2) && comparer.Equals(m_Item3, objTuple.m_Item3) && comparer.Equals(m_Item4, objTuple.m_Item4) && comparer.Equals(m_Item5, objTuple.m_Item5) && comparer.Equals(m_Item6, objTuple.m_Item6) && comparer.Equals(m_Item7, objTuple.m_Item7); } Int32 IComparable.CompareTo(Object obj) { return ((IStructuralComparable) this).CompareTo(obj, Comparer<Object>.Default); } Int32 IStructuralComparable.CompareTo(Object other, IComparer comparer) { if (other == null) return 1; Tuple<T1, T2, T3, T4, T5, T6, T7> objTuple = other as Tuple<T1, T2, T3, T4, T5, T6, T7>; if (objTuple == null) { throw new ArgumentException(Environment.GetResourceString("ArgumentException_TupleIncorrectType", this.GetType().ToString()), "other"); } int c = 0; c = comparer.Compare(m_Item1, objTuple.m_Item1); if (c != 0) return c; c = comparer.Compare(m_Item2, objTuple.m_Item2); if (c != 0) return c; c = comparer.Compare(m_Item3, objTuple.m_Item3); if (c != 0) return c; c = comparer.Compare(m_Item4, objTuple.m_Item4); if (c != 0) return c; c = comparer.Compare(m_Item5, objTuple.m_Item5); if (c != 0) return c; c = comparer.Compare(m_Item6, objTuple.m_Item6); if (c != 0) return c; return comparer.Compare(m_Item7, objTuple.m_Item7); } public override int GetHashCode() { return ((IStructuralEquatable) this).GetHashCode(EqualityComparer<Object>.Default); } Int32 IStructuralEquatable.GetHashCode(IEqualityComparer comparer) { return Tuple.CombineHashCodes(comparer.GetHashCode(m_Item1), comparer.GetHashCode(m_Item2), comparer.GetHashCode(m_Item3), comparer.GetHashCode(m_Item4), comparer.GetHashCode(m_Item5), comparer.GetHashCode(m_Item6), comparer.GetHashCode(m_Item7)); } Int32 ITupleInternal.GetHashCode(IEqualityComparer comparer) { return ((IStructuralEquatable) this).GetHashCode(comparer); } public override string ToString() { StringBuilder sb = new StringBuilder(); sb.Append("("); return ((ITupleInternal)this).ToString(sb); } string ITupleInternal.ToString(StringBuilder sb) { sb.Append(m_Item1); sb.Append(", "); sb.Append(m_Item2); sb.Append(", "); sb.Append(m_Item3); sb.Append(", "); sb.Append(m_Item4); sb.Append(", "); sb.Append(m_Item5); sb.Append(", "); sb.Append(m_Item6); sb.Append(", "); sb.Append(m_Item7); sb.Append(")"); return sb.ToString(); } /// <summary> /// The number of positions in this data structure. /// </summary> int ITuple.Length => 7; /// <summary> /// Get the element at position <param name="index"/>. /// </summary> object ITuple.this[int index] { get { switch (index) { case 0: return Item1; case 1: return Item2; case 2: return Item3; case 3: return Item4; case 4: return Item5; case 5: return Item6; case 6: return Item7; default: throw new IndexOutOfRangeException(); } } } } [Serializable] public class Tuple<T1, T2, T3, T4, T5, T6, T7, TRest> : IStructuralEquatable, IStructuralComparable, IComparable, ITupleInternal, ITuple { private readonly T1 m_Item1; private readonly T2 m_Item2; private readonly T3 m_Item3; private readonly T4 m_Item4; private readonly T5 m_Item5; private readonly T6 m_Item6; private readonly T7 m_Item7; private readonly TRest m_Rest; public T1 Item1 { get { return m_Item1; } } public T2 Item2 { get { return m_Item2; } } public T3 Item3 { get { return m_Item3; } } public T4 Item4 { get { return m_Item4; } } public T5 Item5 { get { return m_Item5; } } public T6 Item6 { get { return m_Item6; } } public T7 Item7 { get { return m_Item7; } } public TRest Rest { get { return m_Rest; } } public Tuple(T1 item1, T2 item2, T3 item3, T4 item4, T5 item5, T6 item6, T7 item7, TRest rest) { if (!(rest is ITupleInternal)) { throw new ArgumentException(Environment.GetResourceString("ArgumentException_TupleLastArgumentNotATuple")); } m_Item1 = item1; m_Item2 = item2; m_Item3 = item3; m_Item4 = item4; m_Item5 = item5; m_Item6 = item6; m_Item7 = item7; m_Rest = rest; } public override Boolean Equals(Object obj) { return ((IStructuralEquatable) this).Equals(obj, EqualityComparer<Object>.Default);; } Boolean IStructuralEquatable.Equals(Object other, IEqualityComparer comparer) { if (other == null) return false; Tuple<T1, T2, T3, T4, T5, T6, T7, TRest> objTuple = other as Tuple<T1, T2, T3, T4, T5, T6, T7, TRest>; if (objTuple == null) { return false; } return comparer.Equals(m_Item1, objTuple.m_Item1) && comparer.Equals(m_Item2, objTuple.m_Item2) && comparer.Equals(m_Item3, objTuple.m_Item3) && comparer.Equals(m_Item4, objTuple.m_Item4) && comparer.Equals(m_Item5, objTuple.m_Item5) && comparer.Equals(m_Item6, objTuple.m_Item6) && comparer.Equals(m_Item7, objTuple.m_Item7) && comparer.Equals(m_Rest, objTuple.m_Rest); } Int32 IComparable.CompareTo(Object obj) { return ((IStructuralComparable) this).CompareTo(obj, Comparer<Object>.Default); } Int32 IStructuralComparable.CompareTo(Object other, IComparer comparer) { if (other == null) return 1; Tuple<T1, T2, T3, T4, T5, T6, T7, TRest> objTuple = other as Tuple<T1, T2, T3, T4, T5, T6, T7, TRest>; if (objTuple == null) { throw new ArgumentException(Environment.GetResourceString("ArgumentException_TupleIncorrectType", this.GetType().ToString()), "other"); } int c = 0; c = comparer.Compare(m_Item1, objTuple.m_Item1); if (c != 0) return c; c = comparer.Compare(m_Item2, objTuple.m_Item2); if (c != 0) return c; c = comparer.Compare(m_Item3, objTuple.m_Item3); if (c != 0) return c; c = comparer.Compare(m_Item4, objTuple.m_Item4); if (c != 0) return c; c = comparer.Compare(m_Item5, objTuple.m_Item5); if (c != 0) return c; c = comparer.Compare(m_Item6, objTuple.m_Item6); if (c != 0) return c; c = comparer.Compare(m_Item7, objTuple.m_Item7); if (c != 0) return c; return comparer.Compare(m_Rest, objTuple.m_Rest); } public override int GetHashCode() { return ((IStructuralEquatable) this).GetHashCode(EqualityComparer<Object>.Default); } Int32 IStructuralEquatable.GetHashCode(IEqualityComparer comparer) { // We want to have a limited hash in this case. We'll use the last 8 elements of the tuple ITupleInternal t = (ITupleInternal) m_Rest; if(t.Length >= 8) { return t.GetHashCode(comparer); } // In this case, the rest memeber has less than 8 elements so we need to combine some our elements with the elements in rest int k = 8 - t.Length; switch(k) { case 1: return Tuple.CombineHashCodes(comparer.GetHashCode(m_Item7), t.GetHashCode(comparer)); case 2: return Tuple.CombineHashCodes(comparer.GetHashCode(m_Item6), comparer.GetHashCode(m_Item7), t.GetHashCode(comparer)); case 3: return Tuple.CombineHashCodes(comparer.GetHashCode(m_Item5), comparer.GetHashCode(m_Item6), comparer.GetHashCode(m_Item7), t.GetHashCode(comparer)); case 4: return Tuple.CombineHashCodes(comparer.GetHashCode(m_Item4), comparer.GetHashCode(m_Item5), comparer.GetHashCode(m_Item6), comparer.GetHashCode(m_Item7), t.GetHashCode(comparer)); case 5: return Tuple.CombineHashCodes(comparer.GetHashCode(m_Item3), comparer.GetHashCode(m_Item4), comparer.GetHashCode(m_Item5), comparer.GetHashCode(m_Item6), comparer.GetHashCode(m_Item7), t.GetHashCode(comparer)); case 6: return Tuple.CombineHashCodes(comparer.GetHashCode(m_Item2), comparer.GetHashCode(m_Item3), comparer.GetHashCode(m_Item4), comparer.GetHashCode(m_Item5), comparer.GetHashCode(m_Item6), comparer.GetHashCode(m_Item7), t.GetHashCode(comparer)); case 7: return Tuple.CombineHashCodes(comparer.GetHashCode(m_Item1), comparer.GetHashCode(m_Item2), comparer.GetHashCode(m_Item3), comparer.GetHashCode(m_Item4), comparer.GetHashCode(m_Item5), comparer.GetHashCode(m_Item6), comparer.GetHashCode(m_Item7), t.GetHashCode(comparer)); } Contract.Assert(false, "Missed all cases for computing Tuple hash code"); return -1; } Int32 ITupleInternal.GetHashCode(IEqualityComparer comparer) { return ((IStructuralEquatable) this).GetHashCode(comparer); } public override string ToString() { StringBuilder sb = new StringBuilder(); sb.Append("("); return ((ITupleInternal)this).ToString(sb); } string ITupleInternal.ToString(StringBuilder sb) { sb.Append(m_Item1); sb.Append(", "); sb.Append(m_Item2); sb.Append(", "); sb.Append(m_Item3); sb.Append(", "); sb.Append(m_Item4); sb.Append(", "); sb.Append(m_Item5); sb.Append(", "); sb.Append(m_Item6); sb.Append(", "); sb.Append(m_Item7); sb.Append(", "); return ((ITupleInternal)m_Rest).ToString(sb); } /// <summary> /// The number of positions in this data structure. /// </summary> int ITuple.Length { get { return 7 + ((ITupleInternal)Rest).Length; } } /// <summary> /// Get the element at position <param name="index"/>. /// </summary> object ITuple.this[int index] { get { switch (index) { case 0: return Item1; case 1: return Item2; case 2: return Item3; case 3: return Item4; case 4: return Item5; case 5: return Item6; case 6: return Item7; } return ((ITupleInternal)Rest)[index - 7]; } } } } |
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转载自：https://blog.csdn.net/iplayvs2008/article/details/41910835 java格式化时间到毫秒： SimpleDateFormat formatter = new SimpleDateFormat("dd-MMM-yyyy HH:mm:ss:SSS"); String formatStr =formatter.format(new Date(); 附录： java格式化字母表 Symbol Meaning Presentation Example G era designator Text AD y year Number 2009 M month in year Text & Number July & 07 d day in month Number 10 h hour in am/pm (1-12) Number 12 H hour in day (0-23) Number 0 m minute in hour Number 30 s second in minute Number 55 S millisecond Number 978 E day in week Text Tuesday D day in year Number 189 F day of […]
View Details随机数Int的生成 生成无边界的Int
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@Test public void testRandom_generatingIntegerUnbounded() throws Exception { int intUnbounded = new Random().nextInt(); System.out.println(intUnbounded); } |
生成有边界的Int
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@Test public void testRandom_generatingIntegerBounded_withRange() throws Exception { int min = 1; int max = 10; int intBounded = min + ((int) (new Random().nextFloat() * (max - min))); System.out.println(intBounded); } |
包含1而不包含10 使用Apache Common Math来生成有边界的Int
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@Test public void testRandom_generatingIntegerBounded_withApacheMath() throws Exception { int min = 1; int max = 10; int intBounded = new RandomDataGenerator().nextInt(min, max); System.out.println(intBounded); } |
包含1且包含10 使用Apache Common Lang的工具类来生成有边界的Int
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@Test public void testRandom_generatingIntegerBounded_withApacheLangInclusive() throws Exception { int min = 1; int max = 10; int intBounded = RandomUtils.nextInt(min, max); System.out.println(intBounded); } |
包含1而不包含10 使用TreadLocalRandom来生成有边界的Int
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@Test public void testRandom_generatingIntegerBounded_withThreadLocalRandom() throws Exception { int min = 1; int max = 10; int threadIntBound = ThreadLocalRandom.current().nextInt(min, max); System.out.println(threadIntBound); } |
包含1而不包含10 随机数Long的生成 生成无边界的Long
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@Test public void testRandom_generatingLongUnbounded() throws Exception { long unboundedLong = new Random().nextLong(); System.out.println(unboundedLong); } |
因为Random类使用的种子是48bits，所以nextLong不能返回所有可能的long值，long是64bits。 生成有边界的Long
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@Test public void testRandom_generatingLongBounded_withRange() throws Exception { long min = 1; long max = 10; long rangeLong = min + (((long) (new Random().nextDouble() * (max - min)))); System.out.println(rangeLong); } |
以上只会生成1到10的long类型的随机数 使用Apache Commons Math来生成有边界的Long
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@Test public void testRandom_generatingLongBounded_withApacheMath() throws Exception { long min = 1; long max = 10; long rangeLong = new RandomDataGenerator().nextLong(min, max); System.out.println(rangeLong); } |
此方式主要使用的RandomDataGenerator类提供的生成随机数的方法 使用Apache Commons Lang的工具类来生成有边界的Long
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@Test public void testRandom_generatingLongBounded_withApacheLangInclusive() throws Exception { long min = 1; long max = 10; long longBounded = RandomUtils.nextLong(min, max); System.out.println(longBounded); } |
RandomUtils提供了对java.util.Random的补充 使用ThreadLocalRandom生成有边界的Long
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@Test public void testRandom_generatingLongBounded_withThreadLocalRandom() throws Exception { long min = 1; long max = 10; long threadLongBound = ThreadLocalRandom.current().nextLong(min, max); System.out.println(threadLongBound); } |
随机数Float的生成 生成0.0-1.0之间的Float随机数
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@Test public void testRandom_generatingFloat0To1() throws Exception { float floatUnbounded = new Random().nextFloat(); System.out.println(floatUnbounded); } |
以上只会生成包含0.0而不包括1.0的float类型随机数 生成有边界的Float随机数
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@Test public void testRandom_generatingFloatBounded_withRange() throws Exception { float min = 1f; float max = 10f; float floatBounded = min + new Random().nextFloat() * (max - min); System.out.println(floatBounded); } |
使用Apache Common Math来生成有边界的Float随机数
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@Test public void testRandom_generatingFloatBounded_withApacheMath() throws Exception { float min = 1f; float max = 10f; float randomFloat = new RandomDataGenerator().getRandomGenerator().nextFloat(); float generatedFloat = min + randomFloat * (max - min); System.out.println(generatedFloat); } |
使用Apache Common Lang来生成有边界的Float随机数
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@Test public void testRandom_generatingFloatBounded_withApacheLang() throws Exception { float min = 1f; float max = 10f; float generatedFloat = RandomUtils.nextFloat(min, max); System.out.println(generatedFloat); } |
使用ThreadLocalRandom生成有边界的Float随机数 ThreadLocalRandom类没有提供 随机数Double的生成 生成0.0d-1.0d之间的Double随机数
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@Test public void testRandom_generatingDouble0To1() throws Exception { double generatorDouble = new Random().nextDouble(); System.out.println(generatorDouble); } |
与Float相同，以上方法只会生成包含0.0d而不包含1.0d的随机数 生成带有边界的Double随机数
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@Test public void testRandom_generatingDoubleBounded_withRange() throws Exception { double min = 1.0; double max = 10.0; double boundedDouble = min + new Random().nextDouble() * (max - min); System.out.println(boundedDouble); assertThat(boundedDouble, greaterThan(min)); assertThat(boundedDouble, lessThan(max)); } |
使用Apache Common Math来生成有边界的Double随机数
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@Test public void testRandom_generatingDoubleBounded_withApacheMath() throws Exception { double min = 1.0; double max = 10.0; double boundedDouble = new RandomDataGenerator().getRandomGenerator().nextDouble(); double generatorDouble = min + boundedDouble * (max - min); System.out.println(generatorDouble); assertThat(generatorDouble, greaterThan(min)); assertThat(generatorDouble, lessThan(max)); } |
使用Apache Common Lang生成有边界的Double随机数
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@Test public void testRandom_generatingDoubleBounded_withApacheLang() throws Exception { double min = 1.0; double max = 10.0; double generatedDouble = RandomUtils.nextDouble(min, max); System.out.println(generatedDouble); } |
使用ThreadLocalRandom生成有边界的Double随机数
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@Test public void testRandom_generatingDoubleBounded_withThreadLocalRandom() throws Exception { double min = 1.0; double max = 10.0; double generatedDouble = ThreadLocalRandom.current().nextDouble(min, max); System.out.println(generatedDouble); } |
JAVA中有多少可以实现随机数的类或方法? java.util.Random 这个类提供了生成Bytes、Int、Long、Float、Double、Boolean的随机数的方法 java.util.Math.random 方法提供了生成Double随机数的方法，这个方法的内部实现也是调用了java.util.Random的nextDouble方法，只不过它对多线程进行了更好的支持，在多个线程并发时会减少每个随机数生成器的竞争 第三方工具类，如Apache Common Lang库与Apache Common Math库中提供的随机数生成类，真正使用一行代码来实现复杂的随机数生成 java.util.concurrent.ThreadLocalRandom 专为多线程并发使用的随机数生成器，使用的方法为ThreadLocalRandom.current.nextInt()，此类是在JDK1.7中提供的，并且特别适合ForkJoinTask框架，而且在这个类中直接提供了生成有边界的随机数的操作，如public int nextInt(int origin, int bound)，这样也可以一行代码来实现复杂的随机数生成了。 最后的总结为单线程中使用java.util.Random类，在多线程中使用java.util.concurrent.ThreadLocalRandom类。 […]
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import java.math.BigDecimal; import java.text.DecimalFormat; import java.text.NumberFormat; public class format { double f = 111231.5585; public void m1() { BigDecimal bg = new BigDecimal(f); double f1 = bg.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue(); System.out.println(f1); } /** * DecimalFormat转换最简便 */ public void m2() { DecimalFormat df = new DecimalFormat("#.00"); System.out.println(df.format(f)); } /** * String.format打印最简便 */ public void m3() { System.out.println(String.format("%.2f", f)); } public void m4() { NumberFormat nf = NumberFormat.getNumberInstance(); nf.setMaximumFractionDigits(2); System.out.println(nf.format(f)); } public static void main(String[] args) { format f = new format(); f.m1(); f.m2(); f.m3(); f.m4(); } } |
from:https://www.cnblogs.com/chenrenshui/p/6128444.html
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List<String> getMatchers(String regex, String source){ Pattern pattern = Pattern.compile(regex); Matcher matcher = pattern.matcher(source); List<String> list = new ArrayList<>(); while (matcher.find()) { list.add(matcher.group()); } return list; } |
from:https://blog.csdn.net/w305172521/article/details/75330661
View DetailsString -> int s="12345"; int i; 第一种方法：i=Integer.parseInt(s); 第二种方法：i=Integer.valueOf(s).intValue(); 这两种方法有什么区别呢？作用是不是一样的呢？是不是在任何下都能互换呢？ int -> String int i=12345; String s=""; 第一种方法：s=i+""; 第二种方法：s=String.valueOf(i); 这两种方法有什么区别呢？作用是不是一样的呢？是不是在任何下都能互换呢？ 以下是答案： 第一种方法：s=i+""; //会产生两个String对象 第二种方法：s=String.valueOf(i); //直接使用String类的静态方法，只产生一个对象 第一种方法：i=Integer.parseInt(s);//直接使用静态方法，不会产生多余的对象，但会抛出异常 第二种方法：i=Integer.valueOf(s).intValue();//Integer.valueOf(s) 相当于 new Integer(Integer.parseInt(s))，也会抛异常，但会多产生一个对象 ——————————————————————-- 1如何将字串 String 转换成整数 int? A. 有两个方法: 1). int i = Integer.parseInt([String]); 或 i = Integer.parseInt([String],[int radix]); 2). int i = Integer.valueOf(my_str).intValue(); 注: 字串转成 Double, Float, Long 的方法大同小异. 2 如何将整数 int 转换成字串 String ? A. 有叁种方法: 1.) String s = String.valueOf(i); 2.) String s = Integer.toString(i); 3.) String s = "" + i; 注: Double, Float, Long 转成字串的方法大同小异. JAVA数据类型转换 […]
View Details这里使用Random类的nextInt()方法来生成，生成[min,max]区间的随机整数公式： Random rand=new Random(); rand.nextInt(max- min+ 1) + min； 这里封装成方法了：
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/** * 求[Min,Max]区间之间的随机整数。 * @param Min 最小值 * @param Max 最大值 * @return 一个Min和Max之间的随机整数 */ public static int randomIntMinToMax(int Min, int Max) { //如果相等，直接返回，还生成个屁 if(Min==Max) { return Max; } //如果Min比Max大，交换两个的值，如果不交换下面nextInt()会出错 if(Min>Max) { Min^=Max; Max^=Min; Min^=Max; } Random rand=new Random();//nextInt()不是静态方法，不能直接用类名调用 return rand.nextInt(Max - Min + 1) + Min; } |
实例：
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package random; import java.util.Random; public class GetRandom { public static void main(String[] args) { Random rand = new Random(); int Min = 0; int Max = 9; int[] count = new int[Max - Min + 1]; for (int i = 0; i < 10000; i++) { count[randomIntMinToMax(Min, Max)]++; } System.out.println(); char percentCh = '%'; for (int i = 0; i < count.length; i++) { double percent = 100 * (double) count[i] / 10000; System.out.printf("%d生成次数:%-4d,占百分比:%.2f%c\n", i, count[i], percent, percentCh); } } /** * 求[Min,Max]区间之间的随机整数。 * * @param Min * 最小值 * @param Max * 最大值 * @return 一个Min和Max之间的随机整数 */ public static int randomIntMinToMax(int Min, int Max) { // 如果相等，直接返回，还生成个屁 if (Min == Max) { return Max; } // 如果Min比Max大，交换两个的值，如果不交换下面nextInt()会出错 if (Min > Max) { Min ^= Max; Max ^= Min; Min ^= Max; } Random rand = new Random();// nextInt()不是静态方法，不能直接用类名调用 return rand.nextInt(Max - Min + 1) + Min; } } |
运行结果：
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0生成次数:998 ,占百分比:9.98% 1生成次数:962 ,占百分比:9.62% 2生成次数:1005,占百分比:10.05% 3生成次数:1020,占百分比:10.20% 4生成次数:1020,占百分比:10.20% 5生成次数:997 ,占百分比:9.97% 6生成次数:966 ,占百分比:9.66% 7生成次数:1002,占百分比:10.02% 8生成次数:1006,占百分比:10.06% 9生成次数:1024,占百分比:10.24% |
from:https://blog.csdn.net/qq_21808961/article/details/80526231
View Details什么是伪随机数？ 1.伪随机数是看似随机实质是固定的周期性序列,也就是有规则的随机。 2.只要这个随机数是由确定算法生成的,那就是伪随机,只能通过不断算法优化,使你的随机数更接近随机。 (随机这个属性和算法本身就是矛盾的) 3.通过真实随机事件取得的随机数才是真随机数。 Java随机数产生原理： Java的随机数产生是通过线性同余公式产生的,也就是说通过一个复杂的算法生成的。 伪随机数的不安全性： Java自带的随机数函数是很容易被黑客破解的,因为黑客可以通过获取一定长度的随机数序列来推出你的seed,然后就可以预测下一个随机数。 不用种子的不随机性会增大的原因： java.Math.Random()实际是在内部调用java.util.Random()的,使用一个和当前系统时间有关的数字作为种子数。两个随机数就很可能相同。 double a = Math.random()； double b = Math.random(); Random r1 = new Random(); r1.nextInt(10); Random r2 = new Random(); r2.nextInt(10); Java中产生随机数的方法有两种： 第一种：Math.random() 第二种：new Random() 一、java.lang.Math.Random： 调用这个Math.Random()函数能够返回带正号的double值,取值范围是[0.0,1.0),在该范围内（近似）均匀分布。因为返回值是double类型的,小数点后面可以保留15位小数，所以产生相同的可能性非常小,在这一定程度上是随机数。 二、java.util.Random： Random r1 = new Random(); Random r2 = new Random(); Random r3 = new Random(10); Random r4 = […]
View Details时间有关 +1s 1、获取当前毫秒数
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long t1=System.currentTimeMillis(); |
2、毫秒数转换为时间
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Date date2=new Date(); date2.setTime(t1); System.err.println(date2); |
3、时间格式化
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SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH-mm-ss"); String fmDate=simpleDateFormat.format(date2); System.err.println(fmDate); |
4、字符串格式时间获取毫秒数
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String sdate = "2018-06-01 06-06-06"; SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH-mm-ss"); long time = simpleDateFormat.parse(sdate).getTime(); System.err.println(time); |
5、毫秒数的计算 把两个毫秒数差值传进来就可以看见相差多久 原贴：https://blog.csdn.net/sunshinestation/article/details/4568946
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public static String formatDuring(long mss) { long days = mss / (1000 * 60 * 60 * 24); long hours = (mss % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60); long minutes = (mss % (1000 * 60 * 60)) / (1000 * 60); long seconds = (mss % (1000 * 60)) / 1000; return days + " days " + hours + " hours " + minutes + " minutes " + seconds + " seconds "; } |
6、java api提供的方法： 待续 7、时间插入数据库 先转换成yyyy-MM-dd HH:mm:ss这个格式，然后可以以字符串格式插入
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Date date=new Date(); SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); String fmDate=simpleDateFormat.format(date); |
——————— 作者：云驿 来源：CSDN 原文：https://blog.csdn.net/sinat_32238399/article/details/80512452 版权声明：本文为博主原创文章，转载请附上博文链接！
View Details1. 用math.random()实现，比较麻烦的一种方式，思路是：math.random()生成的是[0.0, 1.0)的伪随机数，如果 当前值是0.9…，则直接*1000000返回，其他情况可能生成0.8…，0.03…，0.0003…，这些情况都*1000000，但是结果可能是6位，5位，4位都有可能，那么再加上100000，肯定就保证是6位了。
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for (int i = 0; i <= 200; i++) { int intFlag = (int)(Math.random() * 1000000); String flag = String.valueOf(intFlag); if (flag.length() == 6 && flag.substring(0, 1).equals("9")) { System.out.println(intFlag); } else { intFlag = intFlag + 100000; System.out.println(intFlag); } } |
2. 面试可以用到的一种方式，一行代码实现，思路是：math.random()范围是[0.0, 1.0)，那么math.random()*9+1一定是小于10的，(Math.random()*9+1)*100000一定是<10*100000=1000000的一个数
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for(int j = 0; j< 100; j++){ System.out.println((int)((Math.random()*9+1)*100000)); } |
3. random.nextInt(10)意思是返回大于等于0，小于10的一个正整数， 既然是生成6位随机数，每个数一定是0-9之内的，我循环6次，每次从0-9随机选取一个数字拼接字符串返回，不就行了。
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Random random = new Random(); String result=""; for (int i=0;i<6;i++) { result+=random.nextInt(10); } System.out.println(result); |
4. random.nextInt(10)知道是什么意思了，最大的6位数是999999，最小的六位数是100000，我想到了下面的方法：
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for (int i = 0; i <= 100; i++) { int flag = new Random().nextInt(999999); if (flag < 100000) { flag += 100000; } System.out.println(flag); } |
5. 最后的一种方法，是引入了一个source字符串，从这个字符串里可以随机生成一个子串返回，很多pc网站用这个方法生成带字母数字的验证码，原理类似3
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for (int i = 0; i <= 100; i++) { String sources = "0123456789"; // 加上一些字母，就可以生成pc站的验证码了 Random rand = new Random(); StringBuffer flag = new StringBuffer(); for (int j = 0; j < 6; j++) { flag.append(sources.charAt(rand.nextInt(9)) + ""); } System.out.println(flag.toString()); } |
ps: math.random()生成的是个伪随机数，何为伪随机数，这里java是以当前系统时间的相关数字作为种子数，按照特定复杂算法生成的，其实它生成的大量随机数是线性均匀分布的，黑客是完全可能通过返回的大量随机数结果破解种子数的，所以它并不是真正的随机，叫伪随机数。由此我们可以知道通过计算机生成一个真随机数几乎是不可能的，因为最终的输出结果都是依赖算法程序的，这些算法程序本身就是固定的，我们只能通过更复杂的算法不断优化，让它无限趋近于真随机数，但不绝对。 参考：http://www.cnblogs.com/greatfish/p/5845924.html ——————— 作者：流浪猫走失了 来源：CSDN 原文：https://blog.csdn.net/u012491783/article/details/76862526 版权声明：本文为博主原创文章，转载请附上博文链接！
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