Monthly Archives: June 2026

BigDecimal 比较大小

if(a.compareTo(b) == -1){
System.out.println("a小于b");
}

if(a.compareTo(b) == 0){
System.out.println("a等于b");
}

if(a.compareTo(b) == 1){
System.out.println("a大于b");
}

if(a.compareTo(b) > -1){
System.out.println("a大于等于b");
}

if(a.compareTo(b) < 1){ System.out.println("a小于等于b"); }

Mac系统安装多版本 PHP，低版本 PHP

brew tap shivammathur/php
brew search php
brew install shivammathur/php/php@5.6
brew install brew-php-switcher
brew-php-switcher 7.3