public class Test {     public  static void main(String[] args)    {          //自动装箱的过程中,如果是一个字节大小数字,即-128~127,那么JVM会将其缓存起来         Integer num1 = 5;        Integer num2 = 5;        Integer num3 = 6;        System.out.println(num1 == num2);  //true        System.out.println(num1 == num3);  //false                num1 = -128;        num2 = -128;        System.out.println(num1 == num2);//true                num1 = 128;        num2 = 128;        System.out.println(num1 == num2);//false            } }