动作侦听器Java问题

Question

Ok so im working on a game and right now i have an image and im trying to place buttons under the image in specific places so when the user clicks that part of the screen the image changes. I am having trouble trying to figure out how to format my program for the action listener.

public class TestJFrame{
    private static JFrame frame = new JFrame();
    private static JLabel label = new JLabel();
    private static JButton buttons[] = new JButton[4];

    private static int[][] location = new int[3][4];


    public static void main(String args[]){
        frame.getInsets().set(20, 5, 5, 5);

        frame.setLayout(null);
        frame.setPreferredSize(new Dimension(507, 528));
        frame.pack();
        frame.setResizable(false);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setTitle("Test");

        buttons[0] = new JButton("jbZero");
        buttons[1] = new JButton("jbOne"); 
        buttons[2] = new JButton("jbTwo");
        buttons[3] = new JButton("jbThree");

        frame.add(buttons[0]);
        frame.add(buttons[1]);
        frame.add(buttons[2]);
        frame.add(buttons[3]);

        setButtons();
        frame.setVisible(true);

        buttons[0].setLocation(100, 100);
    }


    private static void setButtons(){
        for (int i=0;i<=3;i++){
            buttons[i].setSize(10, 10);
            buttons[i].setLocation(0, 0);
            buttons[i].setVisible(true);
        }
    }

    public void intializeListener(){
        buttons[0].addActionListener((ActionListener) this);        
    }

    public void buttonsZeroActionPreformed(java.awt.event.ActionEvent e){
        System.out.println("button zero works");
    }
}

So any help would be greatly appreciated.

Answer 1

Depends what do you want to implement in the listener:

1. If they do the same action you implement the listener inside setButtons function:

    private static void setButtons(){ for (int i=0;i<=3;i++){ buttons[i].setSize(10, 10); buttons[i].setLocation(0, 0); buttons[i].setVisible(true); buttons[i].addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { // listener implement btn 0 } }); } } 

2. If each button need unique implementation I think that better implementation will be in a new function setBtnListeners and call it from your main after using setButtons(); :

    private static void setBtnListeners() { buttons[0].addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { // listener implement btn 0 } }); } 

Update: Sorry i'd just noticed you have four buttons... you can just add another one :)