自动装箱(byte常量池)127/128的区别
Integer a = new 127;
Integer b = new 127;
System.out.println(a==b);//ture 常量池byte(-127-127之间)integer b地址不会发生改变;
System.out.println(a.equals(b));//true
System.out.println("---------------------");
Integer a = new 128;
Integer b = new 128;
System.out.println(a==b);//false 常量池byte(-127-127之间)integer b地址发生了改变;
System.out.println(a.equals(b));//true