package com.company;

public class Main {

    public static void main(String[] args) {
        Integer a = 1;
        Integer b = 2;
        Integer c = 3;
        Integer d = 3;
        Integer e = 5;
        Integer f = 5;
        Long g = 3L;
        System.out.println(c == d);
        System.out.println(e == f);
        System.out.println(c == (a + b));
        System.out.println(c.equals(a + b));
        System.out.println(g == (a + b));
        System.out.println(g.equals(a + b));

        //true
        //true
        //true
        //true
       // true
        //false  不支持类型转换
    }
}