Java基础知识强化43：StringBuffer类之StringBuffer的截取功能

 1 package cn.itcast_06;
 2 
 3 /*
 4  * StringBuffer的截取功能:注意返回值类型不再是StringBuffer本身了
 5  * public String substring(int start)
 6  * public String substring(int start,int end)
 7  */
 8 public class StringBufferDemo {
 9     public static void main(String[] args) {
10         // 创建字符串缓冲区对象
11         StringBuffer sb = new StringBuffer();
12 
13         // 添加元素
14         sb.append("hello").append("world").append("java");
15         System.out.println("sb:" + sb);
16 
17         // 截取功能
18         // public String substring(int start)
19         String s = sb.substring(5);
20         System.out.println("s:" + s);
21         System.out.println("sb:" + sb);
22 
23         // public String substring(int start,int end)
24         String ss = sb.substring(5, 10);
25         System.out.println("ss:" + ss);
26         System.out.println("sb:" + sb);
27     }
28 }