java 将byte中的有效长度转换为String的实例代码

package com.javaio.myinputstream; 
 
public class MyConsole { 
  public static void main(String argv[]) throws Exception { 
    System.out.println("please input something:"); 
    byte[] b = new byte[1024]; 
    int len = System.in.read(b); 
    System.out.println("you input is:" + new String(b, 0, len, "UTF-8")); 
  } 
} 

please input something: 
asdfasdf 
you input is:asdfasdf