常见Java面试题 – equals与==

Q1 下面的代码片段的输出是什么？

12345678Object s1 = new String("Hello");Object s2 = new String("Hello");if(s1 == s2) {  System.out.println("s1 and s2 are ==");}else if (s1.equals(s2)) {  System.out.println("s1 and s2 are equals()");}1

A1.输出结果是：

s1 and s2 are equals()

Q2 下面代码片段的输出是什么？

12345678Object s1 = "Hello";Object s2 = "Hello";if (s1 == s2) { System.out.println("s1 and s2 are ==");} else if (s1.equals(s2)) { System.out.println("s1 and s2 are equals()");}

A2.答案是：

s1 and s2 are ==