/**

     *@description: 自动装箱和拆箱

     *@auther: yangsj

     *@created: 2019/4/2 15:48

     */

    @Test

    public void Test7(){

        //自动装箱：

        Integer num = 12;

        //自动拆箱：

        System.out.println(num + 12);//24

　　　　　//基本数据类型的对象缓存：

        // -128~127 输出true

        // 超过该范围，输出false

        Integer num1 = 12;

        Integer num2 = 12;

        System.out.println(num1 == num2);//true

        Integer num3 = 129;

        Integer num4 = 129;

        System.out.println(num3 == num4);//false

        //手动装箱

        Integer num5 = Integer.valueOf(12);

        Integer num6 = Integer.valueOf(12);

        System.out.println(num5 == num6);//true

        Integer num7 = Integer.valueOf(128);

        Integer num8 = Integer.valueOf(128);

        System.out.println(num7 == num8);//false

        Integer num9 = new Integer(12);

        Integer num10 = new Integer(12);

        System.out.println(num9 == num10);//false

    }