129_StringBuilder 添加和反转

 1 package StringBuilder;
 2 /*
 3     StringBuilder的添加和反转方法
 4         public StringBuilder append(任意类型):添加数据,并返回对象本身
 5         public StringBuilder reverse():返回相反的字符序列
 6  */
 7 public class StringBuilderDemo02 {
 8     public static void main(String[] args) {
 9         //创建对象
10         StringBuilder sb = new StringBuilder();
11 
12         // public StringBuilder append(任意类型):添加数据,并返回对象本身
13         StringBuilder sb1 = sb.append("HelloWorld");
14 
15 //        System.out.println("sb:"+sb);
16 //        System.out.println("sb1:"+sb1);
17 //        System.out.println(sb==sb1);
18 
19 //        sb.append("hello");
20 //        sb.append("world");
21 //        sb.append(100);
22 //
23 //        System.out.println("sb:"+sb);
24 
25         //链式编程
26         sb.append("hello").append("world").append(986);
27         System.out.println("sb:"+sb);
28 
29         //public StringBuilder reverse():返回相反的字符序列
30         sb.reverse();
31         System.out.println("sb:"+sb);
32 
33     }
34 }

 

posted @ 2020-12-11 22:13  找不到北的北  阅读(168)  评论(0)    收藏  举报