@SpringBootTest
@Slf4j
public class UnitTest {

    /**
     * 说明：
     *      ==比较的是2个对象的地址，而equals比较的是2个对象的内容
     *
     */
    @Test
    public void Main() {
        Integer a = new Integer(3);
        Integer b = 3;
        int c = 3;
        System.out.println("==");
        System.out.println(a == b);
        System.out.println(a == c);
        System.out.println("equals");
        System.out.println(a.equals(b));
        System.out.println(a.equals(c));
    }
}

运行结果：