这段代码有问题,我找不出来,麻烦各位高手帮帮忙class ButtonPanel extends JPanel{
//create buttons
JButton yellowButton = new JButton("Yellow");
JButton blueButton = new JButton("Blue");
JButton redButton = new JButton("Red");
//add buttons to panel
add(yellowButton);
add(blueButton);
add(redButton);
//create button action
ColorAction yellowAction = new ColorAction(Color.YELLOW);
ColorAction buleAction = new ColorAction(Color.BLUE);
ColorAction redAction = new ColorAction(Color.RED);
//associate actions with buttons
yellowButton.addActionListener(yellowAction);
blueButton.addActionListener(buleAction);
redAction.addActionListener(redAction);
//An action listener that sets implements ActionListener
private class ColorAction implements ActionListener{
private Color backgroundColor;
public ColorAction(Color c){
backgroundColor = c;
}
public void actionPerformed(ActionEvent event){
setBackground(backgroundColor);
}
}
}
class前面没有public是ButtonPanel因为是内部类
//create buttons
JButton yellowButton = new JButton("Yellow");
JButton blueButton = new JButton("Blue");
JButton redButton = new JButton("Red");
//add buttons to panel
add(yellowButton);
add(blueButton);
add(redButton);
//create button action
ColorAction yellowAction = new ColorAction(Color.YELLOW);
ColorAction buleAction = new ColorAction(Color.BLUE);
ColorAction redAction = new ColorAction(Color.RED);
//associate actions with buttons
yellowButton.addActionListener(yellowAction);
blueButton.addActionListener(buleAction);
redAction.addActionListener(redAction);
//An action listener that sets implements ActionListener
private class ColorAction implements ActionListener{
private Color backgroundColor;
public ColorAction(Color c){
backgroundColor = c;
}
public void actionPerformed(ActionEvent event){
setBackground(backgroundColor);
}
}
}
class前面没有public是ButtonPanel因为是内部类
JButton yellowButton = new JButton("Yellow");
JButton blueButton = new JButton("Blue");
JButton redButton = new JButton("Red");
ColorAction yellowAction = new ColorAction(Color.YELLOW);
ColorAction buleAction = new ColorAction(Color.BLUE);
ColorAction redAction = new ColorAction(Color.RED); public ButtonPanel() {
add(yellowButton);
add(blueButton);
add(redButton);
yellowButton.addActionListener(yellowAction);
blueButton.addActionListener(buleAction);
redButton.addActionListener(redAction);
} private class ColorAction implements ActionListener {
private Color backgroundColor; public ColorAction(Color c) {
backgroundColor = c;
} public void actionPerformed(ActionEvent e) {
setBackground(backgroundColor);
}
}
}