1 public class TestString {
2 public static void main(String[]args){
3 String str = "abc";
4 /**StringBuilder*/
5 StringBuilder sb = new StringBuilder();
6 for(int i = 0;i<7;i++){
7 sb.append((char) ('a'+i));//追加单个字符
8 }
9 System.out.println(sb.toString());//转换成String输出
10
11 sb.append(",hello word");//追加字符串
12 System.out.println(sb);
13 /**StringBuffer,下面的方法同样适用于StringBuilder*/
14 StringBuffer sb2 = new StringBuffer("国家电网");
15 sb2.insert(0,"爱").insert(0,"我");//插入字符
16 System.out.println(sb2);
17 sb2.delete(0,2);//删除子字符串
18 System.out.println(sb2);
19 sb2.deleteCharAt(3).deleteCharAt(1);//删除某个字符
20 System.out.println(sb2);
21 System.out.println(sb2.reverse());//字符串逆序
22 }
23 }
