★★ Java の宿題ここで答えます Part 68 ★★

★★ Java の宿題ここで答えます Part 68 ★★ at TECH

748:デフォルトの名無しさん
10/01/19 07:32:41
import java.awt.*; // >>747
import java.awt.event.*;
import javax.swing.*;
public class R747 extends JComponent {
private int x = 100, y = 100;
@Override public void paintComponent(Graphics g) { g.drawOval(x, y, 5 * 2, 5 * 2); }
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
final R747 c = new R747();
f.addKeyListener(new KeyAdapter() {
@Override public void keyPressed(KeyEvent e) {
switch (e.getKeyCode()) {
case KeyEvent.VK_UP: c.y -= 4; break;
case KeyEvent.VK_DOWN: c.y += 4; break;
case KeyEvent.VK_LEFT: c.x -= 4; break;
case KeyEvent.VK_RIGHT: c.x += 4; break;
}
c.repaint();
}
});
f.add(c);
f.setSize(400, 400);
f.setVisible(true);
}
});
}
}

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