Integer

        Integer a = new Integer(10);
        Integer b = new Integer(10);
        System.out.println(a == b);//false

        Integer c = Integer.valueOf(10);
        Integer d = Integer.valueOf(10);
        System.out.println(c == d);//true

        Integer e = 1;
        Integer f = 1;
        System.out.println(e == f);//true

        int g = 10;
        System.out.println(a == g);//true