| package StringBuilder_package; | |
| public class StringBuilder_demo2 { | |
| public static void main(String[] args) { | |
| //1、创建对象 | |
| StringBuilder sb=new StringBuilder(); | |
| //2、添加字符串 | |
| sb.append("aaa").append("bbb").append("ccc").append("ddd"); | |
| System.out.println(sb); | |
| //3、再把StringBuilder变回字符串 | |
| String str=sb.toString(); | |
| System.out.println(str); | |
| } | |
| } | |