测试InputStreamReader的demo(转换流)，将控制台输入内容打印在控制台上

import java.io.*;

public class TestInputStreamReader{

    public static void main(String[] args){
        
        try{
            InputStreamReader isr = new InputStreamReader(System.in);
            BufferedReader br = new BufferedReader(isr);
            String str = null;
            while(!(str = br.readLine()).equalsIgnoreCase("exit")){
                System.out.println(str);
            }
            br.close();
        } catch(IOException e){
            e.printStackTrace();
        } 
        
    }

}