Integer a = new Integer(123);

Integer b = new Integer(123);

System.out.println(a == b);

System.out.println(a.equals(b));

System.out.println(a.equals(123));

System.out.println(a == 123);

输出

false

true

true

true

 

String a = new String("nihao");

String b = new String("nihao");

System.out.println(a==b);

System.out.println(a.equals(b));

System.out.println(a=="nihao");

System.out.println(a.equals("nihao"));

输出

false

true

false

true