字符串缓冲区

 1 public class Demo01 {
 2     public static void main(String[] args) {
 3         StringBuffer buffer=new StringBuffer("you");
 4         StringBuffer buffer1=new StringBuffer();
 5         //System.out.println(buffer1);
 6         //可以连环调用
 7         //you are bueautifultrue5.2
 8         buffer.append(" are").append(" bueautiful").append(true).append(5.2);
 9         //youre bueautifultrue5.2
10         buffer.delete(3, 5).delete(3, 5);//包头不包尾
11         //you bueautifultrue5.2
12         //插入字符串
13         //you are bueautifultrue5.2
14         buffer.insert(4, "are ");
15         //替换指定字符串
16         buffer.replace(0, 3, "She");//包头不包尾
17         //反转
18         buffer.reverse();
19         //转成字符串
20         String str=buffer.toString();
21         System.out.println(buffer);
22         
23     }
24 }