转换流（InputStreamReader和OutputStreamWrite ）

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class test {

public static void main(String[]args)throws IOException{

//将System.in对象转换成Reader对象
InputStreamReader ISR = new InputStreamReader(System.in);
//将普通的Reader包装成BufferedReader,BufferedReader流具有缓冲功能
BufferedReader BR = new BufferedReader(ISR);

System.out.println("What's your name?");
String userInput = BR.readLine(); //program waits here until the user inserts a line of text

System.out.println("Your name is : "+userInput);

BR.close();
ISR.close();
}

}