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无法在gridbaglayout中添加操作侦听器

gridbaglayout actionlistener java

-3

Prapti · 技术社区 · 7 年前

公共类计算{

public static void addComponentsToPane(Container pane) {


        pane.setLayout(new GridBagLayout());
        GridBagConstraints gBC = new GridBagConstraints();

        gBC.ipady = 40;
        gBC.ipadx = 40;

        JTextField JTextField = new JTextField("Hello");
        gBC.fill = GridBagConstraints.HORIZONTAL;
        gBC.gridx = 0;
        gBC.gridy = 0;
        gBC.gridwidth = 4;
        JTextField.setEditable(false);
        pane.add(JTextField, gBC);

        //JButton jbnButton;
        gBC.gridwidth = 1;

        JButton b7 = new JButton("7");
        gBC.gridx = 0;
        gBC.gridy = 1;
        pane.add(b7, gBC);
        // more calculator buttons declared here

//下面是它如何建议actionlistner

        b0.addActionListener(new java.awt.event.ActionListener() {
        @Override
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            b0ActionPerformed(evt);
        }

        private void b0ActionPerformed(ActionEvent evt)  }
        `
    });
    b0.addActionListener(new java.awt.event.ActionListener() {
    public void actionPerformed(java.awt.event.ActionEvent evt) {
        b0ActionPerformed(evt);
    }
    private void b0ActionPerformed(Actionenter Event evt) {}
    });}

    private static void createAndShowGUI() {}

    public static void main(String[] args) {
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }

}

1 回复 | 直到 7 年前

Tadesse 7 年前

我帮你试试这个。您可以在addComponentsToPane方法中为您声明的每个组件添加动作侦听器。此外,您忘记传递帧,因此可以像我一样在主方法中传递它。

public class Calc {

public static void addComponentsToPane(Container pane) {

    pane.setLayout(new GridBagLayout());
    GridBagConstraints gBC = new GridBagConstraints();

    gBC.ipady = 40;
    gBC.ipadx = 40;

    JTextField JTextField = new JTextField("Hello");
    gBC.fill = GridBagConstraints.HORIZONTAL;
    gBC.gridx = 0;
    gBC.gridy = 0;
    gBC.gridwidth = 4;
    JTextField.setEditable(false);
    pane.add(JTextField, gBC);

    //JButton jbnButton;
    gBC.gridwidth = 1;

    JButton b7 = new JButton("7");
    gBC.gridx = 0;
    gBC.gridy = 1;
    pane.add(b7, gBC);
    // more calculator buttons declared here

    b7.addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
            // Write your action here

        }
    });

}

private static void createAndShowGUI(JFrame pane) {
    addComponentsToPane(pane);
    pane.setVisible(true);
}

public static void main(String[] args) {
    javax.swing.SwingUtilities.invokeLater(new Runnable() {
        public void run() {
            createAndShowGUI(new JFrame());
        }
    });
}