1. InputStreamReader將位元組輸入流轉換成字元輸入流
2. OutputStreamWriter將位元組輸出流裝換成字元輸出流
   Tips:字元流比位元組流操作方便

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


  public class test {

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

          //將System.in物件轉換成Reader物件
 

          InputStreamReader ISR = new InputStreamReader(System.in);
          //將普通的Reader包裝成BufferedReader,BufferedReader流具有緩衝功能
          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();
      }

  }