Integer简介

Integer简介

//      当创建范围为[-128,127]时

        Integer a = ;

        Integer b = ;

        Integer c = new Integer();

        System.out.println("a == b :" + (a == b));

        System.out.println("a == c :" + (a == c));

        System.out.println();

//      当创建范围不为[-128,127]时

        Integer d = ;

        Integer e = ;

        Integer f = new Integer();

        System.out.println("d == e :" + (d == e));

        System.out.println("d == f :" + (d == f));

        System.out.println("d e f 互不相等(false为正确测试结果)：" + (d == e || d == f || e == f));

        System.out.println();

//      包装类均为值传递

        Integer g = ;

        Integer h = new Integer();

        Test1(g);

        Test2(h);

        System.out.println("g = "+g);

        System.out.println("h = "+h);

    }

    static void Test1(Integer t) {

        t = ;

        System.out.println("Test1内:  t = " + t);

    }

    static void Test2(Integer t) {

        t = ;

        System.out.println("Test2内:  t = " + t);

    }

}

原文：https://blog.csdn.net/Cactus_Lrg/article/details/81489299 

测试结果如下：

a == b :true
a == c :false

d == e :false
d == f :false
d e f 互不相等(false为正确测试结果)：false

Test1内: t = 1
Test2内: t = 131
g = 0
h = 130