StringBuilder的toString互相转换

package it.cedemo1;
/**
 *            StringBuilder 和 String  相互转换
 *
* */

public class Demo1 {
    public static void main(String[] args) {
     //   String-> StringBuffer
        String s="这是一个字符串";
        //直接newStringBuffer 传入S字符串换
        StringBuffer bu=new StringBuffer(s);
        System.out.println("StringBuffer:"+bu);

        //StringBuffer->String 
        String s1=bu.toString();
        System.out.println("转String:"+s1);






    }
}