【急】关于键盘事件的问题

[catici]

这是我做的关于键盘事件的一个简单的java程序，就是由两个小方块，按上下左右键第一个小方块可以移动，按WSAD四个键让第二个小方块上下左右的移动。可是运行的时候只是两个静止的小正方形，按键盘没有任何反应，希望大家能给点意见……
谢谢了……


import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class KeyEventDemo extends JApplet implements KeyListener{
final int size = 20;
int x1,x2,y1,y2;
int x11,y11,x22,y22;
Color fillColor=Color.red;

public void init(){
setBackground(Color.yellow);
Dimension d =this.getSize();
x1=0;y1=d.height/2-size/2;
x11=x1;y11=y1;
x2=d.width/2-size/2;y2=0;
x22=x2;y22=y2;
this.setFocusable(true);
this.setFocusable(false);


}

public void paint(Graphics g)
{
g.setColor(Color.cyan);
g.fillRect(x11,y11,size,size);
g.fillRect(x22,y22,size,size);
g.setColor(fillColor);
g.fillRect(x1,y1,size,size);
g.fillRect(x2,y2,size,size);

}

/*------------第一个小正方形的移动----------------*/
public void keyPressed(KeyEvent e)
{

if(e.getKeyCode()==KeyEvent.VK_UP)
{
y11=y1;x11=x1;
y1=y1-8;
if(y1<=3)y1=3;
repaint();

}

else if(e.getKeyCode()==KeyEvent.VK_DOWN)
{
y11=y1;x11=x1;
y1=y1+8;
if(y1>=getSize().height-3-size)y1=getSize().height-3-size;
repaint();
}

else if(e.getKeyCode()==KeyEvent.VK_LEFT)
{
x11=x1;y11=y1;
x1=x1-8;
if(x1<=3) x1=3;
repaint();

}

else if(e.getKeyCode()==KeyEvent.VK_RIGHT)
{
x11=x1;y11=y1;
x1=x1+8;
if(x1>=getSize().height-3-size)x1=getSize().height-3-size;
repaint();
}



}
/*------------第二个小正方形的移动----------------*/
public void keyTyped(KeyEvent e)
{
char ch=e.getKeyChar();
if(ch=='W'||ch=='w')
{
y22=y2;x22=x2;
y2=y2-8;
if(y2<=3)y2=3;
repaint();

}

else if(ch=='S'||ch=='s')
{
y22=y2;x22=x2;
y2=y2+8;
if(y2>=getSize().height-3-size)y2=getSize().height-3-size;
repaint();
}

else if(ch=='A'||ch=='a')
{
x22=x2;y22=y2;
x2=x2-8;
if(x2<=3) x2=3;
repaint();

}

else if(ch=='D'||ch=='d')
{
x22=x2;y22=y2;
x2=x2+8;
if(x2>=getSize().height-3-size)x2=getSize().height-3-size;
repaint();

}


}

public void keyReleased(KeyEvent e){}

}

[lucky_9_9]

public void keyPressed(KeyEvent e) {
				int mes=e.getKeyCode();//接收按键值
				if(KeyEvent.VK_DOWN==mes){
                                //按向下键要做的事
                                    }
                                if(KeyEvent.VK_UP==mes){
                                //按向上键要做的事
                                    }
                                if(KeyEvent.VK_LEFT==mes){
                                //按向左要做的事
                                    }
                                if(KeyEvent.VK_RIGHT==mes){
                                //按向右键要做的事
                                    }

}

                                

[swandragon]

注释掉this.setFocusable(false);
加上监听

public void init(){
    setBackground(Color.yellow);
    Dimension d =this.getSize();
    x1=0;y1=d.height/2-size/2;
    x11=x1;y11=y1;
    x2=d.width/2-size/2;y2=0;
    x22=x2;y22=y2;
    this.setFocusable(true);
    //this.setFocusable(false);   
    addKeyListener(this);
} 

[catici]

不好意思，楼上的两位，我按照你们说的去改了，怎么不行呢？

[阳二快跑]

public void init(){
setBackground(Color.yellow);
Dimension d =this.getSize();
x1=0;y1=d.height/2-size/2;
x11=x1;y11=y1;
x2=d.width/2-size/2;y2=0;
x22=x2;y22=y2;
this.setFocusable(true);
this.setFocusable(false);
this.addKeyListener(this); //Add
this.setFocusable(true); //Add
this.requestFocus(); //Add
}

[zuijiejina]

是没有重画吗？楼主你测试下，repaint语句执行了吗？或者是事实上重画了，但是japplet没有显示？

[zuijiejina]

[code=java]
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class KeyEventDemo extends JApplet implements KeyListener{



final int size = 20;
int x1,x2,y1,y2;
int x11,y11,x22,y22;
Color fillColor=Color.red;


public void init(){
this.addKeyListener(this);
setBackground(Color.yellow);
Dimension d =this.getSize();
x1=0;y1=d.height/2-size/2;
x11=x1;y11=y1;
x2=d.width/2-size/2;y2=0;
x22=x2;y22=y2;
this.setFocusable(true);
// this.setFocusable(false);


}

public void paint(Graphics g)
{
g.setColor(Color.cyan);
g.fillRect(x11,y11,size,size);
g.fillRect(x22,y22,size,size);
g.setColor(fillColor);
g.fillRect(x1,y1,size,size);
g.fillRect(x2,y2,size,size);


}


/*------------第一个小正方形的移动----------------*/
public void keyPressed(KeyEvent e)
{

if(e.getKeyCode()==KeyEvent.VK_UP)
{

y11=y1;x11=x1;
y1=y1-8;
if(y1 <=3)y1=3;
repaint();

}

else if(e.getKeyCode()==KeyEvent.VK_DOWN)
{
y11=y1;x11=x1;
y1=y1+8;
if(y1>=getSize().height-3-size)y1=getSize().height-3-size;
repaint();
}

else if(e.getKeyCode()==KeyEvent.VK_LEFT)
{
x11=x1;y11=y1;
x1=x1-8;
if(x1 <=3) x1=3;
repaint();

}

else if(e.getKeyCode()==KeyEvent.VK_RIGHT)
{
x11=x1;y11=y1;
x1=x1+8;
if(x1>=getSize().height-3-size)x1=getSize().height-3-size;
repaint();
}


}
/*------------第二个小正方形的移动----------------*/
public void keyTyped(KeyEvent e)
{
char ch=e.getKeyChar();
if(ch=='W'||ch=='w')
{
y22=y2;x22=x2;
y2=y2-8;
if(y2 <=3)y2=3;
repaint();

}

else if(ch=='S'||ch=='s')
{
y22=y2;x22=x2;
y2=y2+8;
if(y2>=getSize().height-3-size)y2=getSize().height-3-size;
repaint();
}

else if(ch=='A'||ch=='a')
{
x22=x2;y22=y2;
x2=x2-8;
if(x2 <=3) x2=3;
repaint();

}

else if(ch=='D'||ch=='d')
{
x22=x2;y22=y2;
x2=x2+8;
if(x2>=getSize().height-3-size)x2=getSize().height-3-size;
repaint();

}


}

public void keyReleased(KeyEvent e){}

}
[code]

[zuijiejina]

楼主帮你改好咯，关键是你没有对japplet进行监听

[catici]

麻烦知道的人能不能帮忙一下啊？

[catici]

[Quote=引用 8 楼 zuijiejina 的回复:]
楼主帮你改好咯，关键是你没有对japplet进行监听
[/Quote]

谢谢你哦……
O(∩_∩)O~