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import java.io.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class KeyboardReader¡¡//×÷Ó㺴ӼüÅ̶ÁÈëÊý¾Ý
{
¡¡¡¡private BufferedReader reader;
 
¡¡¡¡ public KeyboardReader()
 ¡¡¡¡{
 ¡¡¡¡ ¡¡¡¡reader = new BufferedReader(new InputStreamReader(System.in));
 ¡¡¡¡}
 
¡¡¡¡ public String getKeyboardInput()
 ¡¡¡¡{
  ¡¡¡¡¡¡¡¡return readKeyboard();
 ¡¡¡¡}
  
 ¡¡¡¡public int getKeyboardInteger()  //´Ó¼üÅ̶ÁÈëÒ»¸öintÐ͵ÄÊý¡£
 ¡¡¡¡{
 ¡¡¡¡¡¡¡¡ return Integer.parseInt(readKeyboard()); 
 ¡¡¡¡}
 
 ¡¡¡¡public double getKeyboardDouble()  //´Ó¼üÅ̶ÁÈëÒ»¸ödoubleÐ͵ÄÊý
 ¡¡¡¡{
 ¡¡¡¡¡¡¡¡ return Double.parseDouble(readKeyboard());
 ¡¡¡¡}
 
 ¡¡¡¡public void prompt(String s)   //ÏÔʾ¶ÁÈëµÄ×Ö·û´® £¬Ö÷ÒªÆðÌáʾ×÷Óá£
¡¡¡¡ {
  ¡¡¡¡¡¡¡¡System.out.print(s);
 ¡¡¡¡}
 
 ¡¡¡¡public void display(String s)  //ÏÔʾ¶ÁÈëµÄ×Ö·û´®£¬Óëprompt()²»Í¬£¬¸Ã·½·¨Êä³ö½á¹û¡£
 ¡¡¡¡{
  ¡¡¡¡¡¡¡¡System.out.print(s);
 ¡¡¡¡}
 
 ¡¡¡¡private String readKeyboard() // Òì³£µÄÅжϣ¬¼ì²é´Ó¼üÅÌÊäÈëµÄ×Ö·û´®ÊÇ·ñÓÐÎó¡£
 ¡¡¡¡{
  ¡¡¡¡¡¡¡¡String line = "";
 ¡¡¡¡¡¡¡¡ try
  ¡¡¡¡¡¡¡¡{
  ¡¡¡¡¡¡¡¡¡¡¡¡ line = reader.readLine();
  ¡¡¡¡¡¡¡¡}catch(IOException e)
  ¡¡¡¡¡¡¡¡¡¡{
   ¡¡¡¡¡¡¡¡¡¡¡¡¡¡e.printStackTrace();
  ¡¡¡¡¡¡¡¡¡¡}
  ¡¡¡¡¡¡¡¡return line;
 ¡¡¡¡}
¡¡}
class GreeterApp    // ¸ÃÀà½ÓÊÕÊäÈëµÄÃû×Ö£¬²¢ÏÔʾһ¾äÎʺòÓï¡£
{
 ¡¡¡¡private KeyboardReader reader;
 
 ¡¡¡¡public GreeterApp()
 ¡¡¡¡{
  ¡¡¡¡¡¡¡¡reader = new KeyboardReader();
 ¡¡¡¡}
 
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