java 整型int占4个字节32位，两个数异或后移动31位判断结果，如果是1则异号，如果是0则同号
1 public class ShowEnviromentViarible { 2 3 public static void main(String[] args) { 4 int num1 = 1; 5 int num2 = -1; 6 System.out.println("num1 = " + num1); 7 System.out.println("num2 = " + num2); 8 System.out.println((num1 ^ num2) >>> 31); //无符号移动31位，最左边补0 9 num1 = 1; 10 num2 = 1; 11 System.out.println("num1 = " + num1); 12 System.out.println("num2 = " + num2); 13 System.out.println((num1 ^ num2) >>> 31); 14 num1 = -1; 15 num2 = -1; 16 System.out.println("num1 = " + num1); 17 System.out.println("num2 = " + num2); 18 System.out.println((num1 ^ num2) >>> 31); 19 } 20 21 }output:
num1 = 1 num2 = -1 1 num1 = 1 num2 = 1 0 num1 = -1 num2 = -1 0
