Java 如何正确使用ActionListener?
我试图做一个“简单的tetras”游戏作为一个开始的编码器。如下图所示的代码,当在计时器内无法执行(Java 如何正确使用ActionListener?,java,actionlistener,Java,Actionlistener,我试图做一个“简单的tetras”游戏作为一个开始的编码器。如下图所示的代码,当在计时器内无法执行(y=y+10)操作时,按下箭头键可以移动白色块。我猜ActionListener放错位置了。我想做的就是能够在块下降时左右移动块 这是我的密码: import java.awt.event.*; import java.awt.Color; import java.awt.Graphics; import java.awt.event.ActionEvent; import java.awt.ev
y=y+10
)操作时,按下箭头键可以移动白色块。我猜ActionListener
放错位置了。我想做的就是能够在块下降时左右移动块
这是我的密码:
import java.awt.event.*;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;
public class Experiment extends JFrame {
int x = 100;
int y = 100;
ASD exp = new ASD();
public Experiment() {
add(exp);
exp.setFocusable(true);
}
public class ASD extends JPanel {
public ASD() {
addKeyListener(new KeyAdapter() {
public void keyPressed(KeyEvent e) {
switch (e.getKeyCode()) {
//case KeyEvent.VK_DOWN: y += 10;break;
//case KeyEvent.VK_UP: y -= 10; break;
case KeyEvent.VK_LEFT:
x -= 10;
break;
case KeyEvent.VK_RIGHT:
x += 10;
break;
}
repaint();
}
});
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
setBackground(Color.BLACK);
g.setColor(Color.WHITE);
g.fillRect(x, y, 30, 30);
}
public class Movement extends JPanel implements ActionListener {
Timer tm = new Timer(5, this);
public void actionPerformed(ActionEvent e) {
y = y + 10;
repaint();
}
}
}
public static void main(String[] args) {
Experiment frame = new Experiment();
frame.setTitle("ASD");
frame.setSize(600, 400);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
代码的主要问题是
tm.start()
ASD
public class ASD extends JPanel implements ActionListener {
private Timer tm;
public ASD() {
addKeyListener(new KeyAdapter() {
public void keyPressed(KeyEvent e) {
switch (e.getKeyCode()) {
//case KeyEvent.VK_DOWN: y += 10;break;
//case KeyEvent.VK_UP: y -= 10; break;
case KeyEvent.VK_LEFT:
x -= 10;
break;
case KeyEvent.VK_RIGHT:
x += 10;
break;
}
repaint();
}
});
tm = new Timer(200, this);
tm.setRepeats(true);
tm.start();
}
@Override
public void actionPerformed(ActionEvent e) {
y = y + 10;
repaint();
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
setBackground(Color.BLACK);
g.setColor(Color.WHITE);
g.fillRect(x, y, 30, 30);
}
}