我想同时拥有两个JLabel（创建两个圆圈），并且可以通过键盘移动。然而，只有绿色的Vert出现而不是蓝色的Bleu。
public class FenJeu extends JPanel{
int xPos;
int yPos;
public FenJeu(int r, int v, int b) {
JLabel image = new JLabel();
add(new Vert());
add(new Bleu());
image.setVisible(true);
image.setEnabled(true);
//image.setIcon(new ImageIcon("D:\\terrain.png"));
//image.setBounds(1,1,1680,1050);
//image.setPreferredSize(new Dimension(1680,1050));
add(image);
}
public class Vert extends JPanel {
public Vert() {
Action leftAction = new AbstractAction() {
@Override
public void actionPerformed(ActionEvent e) {
xPos -= 50;
if (xPos < 0) {
xPos = 0;
}
repaint();
}
};
Action rightAction = new AbstractAction() {
@Override
public void actionPerformed(ActionEvent e) {
xPos += 50;
if (xPos + 10 > getWidth()) {
xPos = getWidth() - 10;
}
repaint();
}
};
Action upAction = new AbstractAction() {
@Override
public void actionPerformed(ActionEvent e) {
yPos -= 50;
if (yPos + 10 > getWidth()) {
yPos = getWidth() - 10;
}
repaint();
}
};
Action downAction = new AbstractAction() {
@Override
public void actionPerformed(ActionEvent e) {
yPos += 50;
if (yPos < 0) {
yPos = 0;
}
repaint();
}
};
bindKeyStroke(WHEN_IN_FOCUSED_WINDOW, "move.left", KeyStroke.getKeyStroke(KeyEvent.VK_LEFT, 0), leftAction);
bindKeyStroke(WHEN_IN_FOCUSED_WINDOW, "move.right", KeyStroke.getKeyStroke(KeyEvent.VK_RIGHT, 0), rightAction);
bindKeyStroke(WHEN_IN_FOCUSED_WINDOW, "move.up", KeyStroke.getKeyStroke(KeyEvent.VK_UP, 0), upAction);
bindKeyStroke(WHEN_IN_FOCUSED_WINDOW, "move.down", KeyStroke.getKeyStroke(KeyEvent.VK_DOWN, 0), downAction);
}
protected void bindKeyStroke(int condition, String name, KeyStroke keyStroke, Action action) {
InputMap im = getInputMap(condition);
ActionMap am = getActionMap();
im.put(keyStroke, name);
am.put(name, action);
}
@Override
public Dimension getPreferredSize() {
return new Dimension(1680, 1050);
}
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
//int yPos = (getHeight() - 10) / 2;
//int xPos = (getWidth() -10) / 2;
g2d.setPaint(Color.GREEN);
g2d.fillOval(xPos, yPos, 50, 50);
g2d.dispose();
}
}
public class Bleu extends JPanel {
public Bleu() {
Action lefttAction = new AbstractAction() {
@Override
public void actionPerformed(ActionEvent e) {
xPos -= 50;
if (xPos < 0) {
xPos = 0;
}
repaint();
}
};
Action righttAction = new AbstractAction() {
@Override
public void actionPerformed(ActionEvent e) {
xPos += 50;
if (xPos + 10 > getWidth()) {
xPos = getWidth() - 10;
}
repaint();
}
};
Action uppAction = new AbstractAction() {
@Override
public void actionPerformed(ActionEvent e) {
yPos -= 50;
if (yPos + 10 > getWidth()) {
yPos = getWidth() - 10;
}
repaint();
System.out.println("oui");
}
};
Action downnAction = new AbstractAction() {
@Override
public void actionPerformed(ActionEvent e) {
yPos += 50;
if (yPos < 0) {
yPos = 0;
}
repaint();
}
};
bindKeyStroke1(WHEN_IN_FOCUSED_WINDOW, "move.leftt", KeyStroke.getKeyStroke(KeyEvent.VK_Q, 0), lefttAction);
bindKeyStroke1(WHEN_IN_FOCUSED_WINDOW, "move.rightt", KeyStroke.getKeyStroke(KeyEvent.VK_D, 0), righttAction);
bindKeyStroke1(WHEN_IN_FOCUSED_WINDOW, "move.upp", KeyStroke.getKeyStroke(KeyEvent.VK_Z, 0), uppAction);
bindKeyStroke1(WHEN_IN_FOCUSED_WINDOW, "move.downn", KeyStroke.getKeyStroke(KeyEvent.VK_S, 0), downnAction);
}
protected void bindKeyStroke1(int conditionn, String namee, KeyStroke keyStrokee, Action actionn) {
InputMap om = getInputMap(conditionn);
ActionMap pm = getActionMap();
om.put(keyStrokee, namee);
pm.put(namee, actionn);
}
protected void paintComponent1(Graphics f) {
super.paintComponent(f);
Graphics2D g3d = (Graphics2D) f.create();
//int yPos = (getHeight() - 10) / 2;
// int xPos = (getWidth() -10) / 2;
g3d.setPaint(Color.BLUE);
g3d.fillOval(xPos, yPos, 50, 50);
g3d.dispose();
}
}
}
Vert面板尺寸为1680x1050（参见Vert#getPreferredSize()），Bleu没有定义尺寸，因此将设置最小的元件尺寸。paintComponent和Vert覆盖JPanel的Bleu方法，但Bleu中的方法名称是paintComponent1。如果你更正方法名称将绘制蓝色圆圈，但由于尺寸最小，你只会看到它的一小部分。默认的JPanel布局是FlowLayout，所以你的Bleu面板将位于Vert之后的右侧。