这个监听器怎么没效果？？

[lian_2010]

import java.awt.*;
import java.awt.event.KeyEvent;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
public class App_0622 extends JFrame
{

	/**
	 * @param args
	 */private JLabel lbl;
	 Container c=getContentPane();
	
	 public App_0622()
	 {
		 super("Image");
		 c.setLayout(new FlowLayout());
		 lbl=new JLabel(new ImageIcon("2.png"));
		 c.add(lbl);
		 //setSize(460,650);
		 c.addKeyListener(new hand());
		 setVisible(true);

	 }
	class hand extends KeyAdapter
	 {
		 public void keypressed(KeyEvent e)
		 {
			 if(e.getKeyChar()=='r')
			 {
				 for(int i=0;i<30;i++)
				 {
					 try
					 {
					 Thread.sleep(70);
					 c.setSize(16*i,22*i);
					 }
					 catch(InterruptedException q)
			         {
			          
			         }
				 }
			 }
			 if(e.getKeyChar()=='p')
			 {
				 for( int i=29;i>0;i--)
				 {
					 try
					 {
					 Thread.sleep(70);
					 c.setSize(16*i,22*i);
					 }
					 catch(InterruptedException q)
			         {
			          
			         }
				 }
			 }
		 }
	 }
	public static void main(String[] args) 
	{
		// TODO Auto-generated method stub
		App_0622 App=new App_0622();
	}

}

想实现程序运行后，按下r 窗口变大，按下p 变小，但是却没反应，哪里出错呢？？

[周靖峰]

import java.awt.*;
import java.awt.event.KeyEvent;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
public class App_0622 extends JFrame
{

    /**
     * @param args
     */private JLabel lbl;
     Container c=getContentPane();
    
     public App_0622()
     {
         super("Image");
         c.setLayout(new FlowLayout());
         lbl=new JLabel(new ImageIcon("2.png"));
         c.add(lbl);
         //setSize(460,650);
         addKeyListener(new hand());	//这里应该是给JFrame加监听
         setVisible(true);

     }
    class hand extends KeyAdapter
     {
         public void keyPressed(KeyEvent e)	//这里写错了，你写成keypressed了
         {
             if(e.getKeyChar()=='r')
             {
            	 System.out.println("r");
                 for(int i=0;i<30;i++)
                 {
                     try
                     {
                     Thread.sleep(70);
                     setSize(16*i,22*i);	//这里应该是设置JFrame的大小
                     }
                     catch(InterruptedException q)
                     {
                      
                     }
                 }
             }
             if(e.getKeyChar()=='p')
             {
            	 System.out.println("p");
                 for( int i=29;i>0;i--)
                 {
                     try
                     {
                     Thread.sleep(70);
                     setSize(16*i,22*i);	//这里应该是设置JFrame的大小
                     }
                     catch(InterruptedException q)
                     {
                      
                     }
                 }
             }
         }
     }
    public static void main(String[] args) 
    {
        // TODO Auto-generated method stub
        App_0622 App=new App_0622();
    }

}

[Sad4This]

[Quote=引用 1 楼 的回复:]
Java code


import java.awt.*;
import java.awt.event.KeyEvent;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
public class App_0622 extends JFrame
{

/**
……
[/Quote]
正解，lz如果按你那种写法
应该是

public App_0622()
     {
         super("Image");
         c.setLayout(new FlowLayout());
         lbl=new JLabel(new ImageIcon("2.png"));
         c.add(lbl);
         //setSize(460,650);
         c.addKeyListener(new hand());
         add(c);   //不要忘了在Frame里添加c,否则当然看不到你要的效果
         setVisible(true);

     }