Integer的intValue()方法

Integer n1 = 123;
Integer n2 = 123;
Integer n3 = 128;
Integer n4 = 128;
System.out.println(n1 == n2);// true
System.out.println(n3 == n4);// false
System.out.println(n3.intValue()==n4.intValue());// true
System.out.println(128==n3);// true
System.out.println(128==n4);// true
// 对象的hashcode值
System.out.println(System.identityHashCode(n1));// 366712642
System.out.println(System.identityHashCode(n2));// 366712642
System.out.println(System.identityHashCode(n3));// 1829164700
System.out.println(System.identityHashCode(n4));// 2018699554