import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
public class Pete extends JFrame
{
PetePanel pete =new PetePanel();
public Pete()
{
super("Pixel Pete");
setSize(500,500);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel pane=new JPanel();
pane.setLayout(new GridLayout(1,1,15,15));
pane.add(pete);
setContentPane(pane);
show();
}
public static void main(String[] arguments)
{
Pete Penguin =new Pete();
PetePanel a=new PetePanel();
}
}
class PetePanel extends JPanel implements KeyListener//,Runnable
{
//JPanel.requestFocus();
//Thread runner;
Image petePics[]=new Image[4];
Image back;
int current=0;
int x=100;
int y=100;
PetePanel()
{
super();
setBackground(Color.black);
String peteSrc[]={"right.jpg","left.jpg","up.jpg","down.jpg"};
Toolkit kit = Toolkit.getDefaultToolkit();
for(int i=0;i<petePics.length;i++)
{
petePics[i]=kit.getImage(peteSrc[i]);
}
back=kit.getImage("abc.bmp");
//if(runner==null)
//{
//runner=new Thread(this);
//runner.start();
//}
}
public void paint(Graphics comp)
{
Graphics2D comp2D=(Graphics2D)comp;
//if(back!=null)
//comp2D.drawImage(back,0,0,this);
comp2D.setColor(Color.black);
comp2D.fillRect(0,0,500,500);
if(petePics[current]!=null)
comp2D.drawImage(petePics[current],x,y,this);
}
public void fun()
{
for(int i=0;i<500;i++)
{
x=x+5;
current=1;
repaint();
}
}
this.addKeyListener(new KeyAdapter() {
@Override
public void keyPressed(KeyEvent e)
{
if(e.getKeyCode()==KeyEvent.VK_LEFT)
{
current=1;
x=x-10;
}
else if(e.getKeyCode()==KeyEvent.VK_RIGHT)
{
current=0;
x=x+10;
}
else if(e.getKeyCode()==KeyEvent.VK_UP)
{
current=2;
y=y-10;
}
else if(e.getKeyCode()==KeyEvent.VK_DOWN)
{
current=3;
y=y-10;
}
repaint();
}
public void keyTyped(KeyEvent e){}
public void keyReleased(KeyEvent e){}
});
}}
------解决方案--------------------
- Java code
import java.awt.*;import java.awt.event.*;import javax.swing.*;public class Pete extends JFrame { PetePanel pete = new PetePanel(); public Pete() { super("Pixel Pete"); setSize(500, 500); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JPanel pane = new JPanel(); pane.setLayout(new GridLayout(1, 1, 15, 15)); pane.add(pete); this.addKeyListener(new KeyAdapter(){//没有得到焦点，放frame容易获取焦点。 @Override public void keyPressed(KeyEvent e) { System.out.println("ppppp"); if (e.getKeyCode() == KeyEvent.VK_LEFT) { pete.current = 1; pete.x =pete.x - 10; } else if (e.getKeyCode() == KeyEvent.VK_RIGHT) { pete.current = 0; pete.x = pete.x + 10; } else if (e.getKeyCode() == KeyEvent.VK_UP) { pete.current = 2; pete.y = pete.y - 10; } else if (e.getKeyCode() == KeyEvent.VK_DOWN) { pete.current = 3; pete.y = pete.y - 10; } repaint(); } public void keyTyped(KeyEvent e){ System.out.println("kkkkk"); } public void keyReleased(KeyEvent e) { System.out.println("rrrrrr"); } }); setContentPane(pane); this.setVisible(true); this.requestFocus();//具体办法可以手设焦点。如果焦点有问题，就优先想到它 } public static void main(String[] arguments) { Pete Penguin = new Pete(); PetePanel a = new PetePanel(); }}class PetePanel extends JPanel{ // JPanel.requestFocus(); // Thread runner; Image petePics[] = new Image[4]; Image back; int current = 0; int x = 100; int y = 100; PetePanel() { super(); setBackground(Color.black); String peteSrc[] = { "right.jpg", "left.jpg", "up.jpg", "down.jpg" }; Toolkit kit = Toolkit.getDefaultToolkit(); for (int i = 0; i < petePics.length; i++) { petePics[i] = kit.getImage(peteSrc[i]); } back = kit.getImage("abc.bmp"); // if(runner==null) // { // runner=new Thread(this); // runner.start(); // } } public void paint(Graphics comp) { Graphics2D comp2D = (Graphics2D) comp; // if(back!=null) // comp2D.drawImage(back,0,0,this); comp2D.setColor(Color.black); comp2D.fillRect(0, 0, 500, 500); if (petePics[current] != null) comp2D.drawImage(petePics[current], x, y, this); } public void fun() { for (int i = 0; i < 500; i++) { x = x + 5; current = 1; repaint(); } }}