Objects 类的equals方法

　　

 1 package Demo008;
 2 
 3 import java.util.Objects;
 4 
 5 public class Demo03Objects {
 6     public static void main(String[] args) {
 7         String s1 = null;
 8         String s2 = "abc";
 9 
10         /*
11         Objects类的equals方法：对两个对象进行比较，防止空指针异常
12          public static boolean equals(Object a, Object b) {
13             return (a == b) || (a != null && a.equals(b));
14            }
15         */
16         boolean equals = Objects.equals(s1, s2);
17         System.out.println(equals);
18 
19 
20     }
21 }

 

posted @ 2020-11-09 00:14  ZHU_FENG  阅读(805)  评论(0)    收藏  举报