如何修改附加到多个 JButton 的动作侦听器的参数？

Question

我有一个任务，我必须为一个绘画应用程序项目创建一个按钮数组，一切都完成了，但我被困在分配/引用/修改我的动作侦听器上。

它的工作方式（假设）是我有一个循环，它创建、分配一个名称，并向动作侦听器添加一个名为 myShapes 的 JButton 数组。由此，我应该有一个名为 listener() 的 actionlistener；给每个 jbutton 一个 int 1-6，设置当前的 actionPerformed 状态。

int actionNum = 1;

ActionListener listener = new ActionListener() {

    @Override

    public void actionPerformed(ActionEvent e) {

        currentAction = actionNum;

    }

};  

//........................................................................

String[] myShapesName = {"brushBut", "lineBut", "ellipseBut", "rectBut", "strokeBut", "fillBut"};

//String[] myLisName = {"brushButL", "lineButL", "ellipseButL", "rectButL", "strokeButL", "fillButL"};

JButton[][] myShapes = new JButton[3][2];

for (int i = 0; i < 3; i++) {

    for (int j = 0; j < 2; j++) {

        myShapes[i][j] = new JButton();

        myShapes[i][j].setBounds(0, 0, 50, 50);//(100, 200);

        myShapes[i][j].setName(myShapesName[i+j]);

        myShapes[i][j].setBackground(null);

        myShapes[i][j].putClientProperty("id",

        String.valueOf(myShapesName[i+j]).concat(String.valueOf(j)));

        MyShapesBox.add(myShapes[i][j]);

        System.out.println(listener);

    }

}

问题是我不知道如何更改 actionlistener 以便它为所有 6 个 Jbuttons 提供不同的 actionPerformed 状态，因为每个状态代表不同的画笔。我尝试了几种方法，例如尝试创建一个动作列表数组并重命名它们，但这会导致错误或循环中断，这是分配所需的，并以最后一次尝试结束。不幸的是，这目前超出了我的范围。如果在这上面呆了 2 天，我就很难过。

Answer 1

我的第一个想法是创建一个动作类，它将一个int值作为其构造函数的一部分，为简单起见，我将其设为内部类，但您可以使用外部类，但您需要传递更多详细信息，例如...public class TestPane extends JPanel {&nbsp; &nbsp; private int currenAction;&nbsp; &nbsp; public TestPane() {&nbsp; &nbsp; &nbsp; &nbsp; String[] myShapesName = {"brushBut", "lineBut", "ellipseBut", "rectBut", "strokeBut", "fillBut"};&nbsp; &nbsp; &nbsp; &nbsp; //String[] myLisName = {"brushButL", "lineButL", "ellipseButL", "rectButL", "strokeButL", "fillButL"};&nbsp; &nbsp; &nbsp; &nbsp; setLayout(new GridLayout(3, 2));&nbsp; &nbsp; &nbsp; &nbsp; JButton[][] myShapes = new JButton[3][2];&nbsp; &nbsp; &nbsp; &nbsp; int action = 0;&nbsp; &nbsp; &nbsp; &nbsp; for (int i = 0; i < 3; i++) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; for (int j = 0; j < 2; j++) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; myShapes[i][j] = new JButton();&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; myShapes[i][j].setBounds(0, 0, 50, 50);//(100, 200);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; myShapes[i][j].setName(myShapesName[i + j]);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; myShapes[i][j].setBackground(null);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; myShapes[i][j].putClientProperty("id",&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; String.valueOf(myShapesName[i + j]).concat(String.valueOf(j)));&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; myShapes[i][j].addActionListener(new ButtonAction(action));&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; action++;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; add(myShapes[i][j]);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; }&nbsp; &nbsp; public class ButtonAction implements ActionListener {&nbsp; &nbsp; &nbsp; &nbsp; private int actionNum;&nbsp; &nbsp; &nbsp; &nbsp; public ButtonAction(int actionNum) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; this.actionNum = actionNum;&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; @Override&nbsp; &nbsp; &nbsp; &nbsp; public void actionPerformed(ActionEvent arg0) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; currenAction = actionNum;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; System.out.println(actionNum);&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; }}