初学java之StringBuffer类的常用方法

  import java.text.*;
   public class Gxjun
  {
     public static void main(String atgs[])
     {
        StringBuffer str= new StringBuffer();
        str.append("大家好");
        System.out.println("str:"+str);
        System.out.println("length:"+str.length());
        System.out.println("capacity:"+str.capacity());
        str.setCharAt(0,'w');
        str.setCharAt(1,'e');
        System.out.println(str);
        str.insert(2, "are all");
        System.out.println(str);
        int index=str.indexOf("好");
        str.replace(index, str.length(),"right");
        System.out.println(str);
     }
  }