import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Test1 extends JFrame{
MyPanel1 mp = null;
JButton jb1,jb2;
public static void main(String[] args) {
Test1 test1 = new Test1();
}
public Test1(){
mp = new MyPanel1();
this.add(mp);
this.addKeyListener(mp);这句话什么意思,还有执行过程
this.setSize(300, 300);
this.setLocation(350, 200);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
this.setVisible(true);
}
}
class MyPanel1 extends JPanel implements KeyListener{
int x = 30;
int y = 30;
public void paint(Graphics g){
super.paint(g);
g.setColor(Color.YELLOW);
g.fill3DRect(x - 5, y - 10, 10, 20, false);
g.drawOval(x - 5, y - 5, 10, 10);
g.fill3DRect(x - 10, y - 15, 5, 30, false);
g.fill3DRect(x + 5, y - 15, 5, 30, false);
g.drawLine(x, y, x, y - 25);
}
public void keyTyped(KeyEvent e) {}
public void keyPressed(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_DOWN) {
y++;
}else if (e.getKeyCode() == KeyEvent.VK_UP) {
y--;
}else if (e.getKeyCode() == KeyEvent.VK_LEFT) {
x--;
}else if (e.getKeyCode() == KeyEvent.VK_RIGHT) {
x++;
}
this.repaint();
}
public void keyReleased(KeyEvent e) {}
}
import java.awt.Graphics;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Test1 extends JFrame{
MyPanel1 mp = null;
JButton jb1,jb2;
public static void main(String[] args) {
Test1 test1 = new Test1();
}
public Test1(){
mp = new MyPanel1();
this.add(mp);
this.addKeyListener(mp);这句话什么意思,还有执行过程
this.setSize(300, 300);
this.setLocation(350, 200);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
this.setVisible(true);
}
}
class MyPanel1 extends JPanel implements KeyListener{
int x = 30;
int y = 30;
public void paint(Graphics g){
super.paint(g);
g.setColor(Color.YELLOW);
g.fill3DRect(x - 5, y - 10, 10, 20, false);
g.drawOval(x - 5, y - 5, 10, 10);
g.fill3DRect(x - 10, y - 15, 5, 30, false);
g.fill3DRect(x + 5, y - 15, 5, 30, false);
g.drawLine(x, y, x, y - 25);
}
public void keyTyped(KeyEvent e) {}
public void keyPressed(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_DOWN) {
y++;
}else if (e.getKeyCode() == KeyEvent.VK_UP) {
y--;
}else if (e.getKeyCode() == KeyEvent.VK_LEFT) {
x--;
}else if (e.getKeyCode() == KeyEvent.VK_RIGHT) {
x++;
}
this.repaint();
}
public void keyReleased(KeyEvent e) {}
}
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因为你的Test1是继承自Jframe的,所以this.addKeyListener应该是JFrame的addKeyListener。然后根据字面理解这个是“添加一个键监听”的方法,这个方法应该需要传入一个对象,而MP就是你的一个MyPane1的实例,所以我的理解就是为本程序的MyPane1增加键监听,只能理解到这样了,哈哈!
是说在当前对象上添加键盘监听 所以下面要重写keyPressed方法 这个方法里面的内容 就是当你的键盘监听器出发之后运行的东西。VK_DOWN 这些东西其实是上下左右 也就是实现了对你键盘的上下左右键的监听