初学java之StringBuffer类的常用方法

 1  import java.text.*;

 2   public class Gxjun

 3  {

 4     public static void main(String atgs[])

 5     {

 6        StringBuffer str= new StringBuffer();

 7        str.append("大家好");

 8        System.out.println("str:"+str);

 9        System.out.println("length:"+str.length());

10        System.out.println("capacity:"+str.capacity());

11        str.setCharAt(0,‘w‘);

12        str.setCharAt(1,‘e‘);

13        System.out.println(str);

14        str.insert(2, "are all");

15        System.out.println(str);

16        int index=str.indexOf("好");

17        str.replace(index, str.length(),"right");

18        System.out.println(str);

19     }

20  }

初学java之StringBuffer类的常用方法