JFrame-JDialog通信

Question

我有一个JFrame主窗口，里面有一个Register按钮，点击Register按钮，弹出JDialog窗口。

public void mouseClicked(MouseEvent e) {
                Reg new1=new Reg(users);
                new1.setVisible(true);
            }

JDialog窗口有两个按钮->Register、Cancel，这两个按钮都必须做一些事情并关闭对话框窗口。

这就是我试过的。在Reg（对话框窗口）中-->btn取消：

public void mouseClicked(MouseEvent e) {
                        dialog.dispose();
                        System.out.println("Reg disposed by cancel button");
                    }

Answer 1

您需要某种方法让框架确定对话框是如何关闭的

// Why are you using a `MouseListener` on buttons??
// User use keyboards to, use an ActionListener instead
public void mouseClicked(MouseEvent e) {
    Reg new1=new Reg(users);
    new1.setVisible(true);
    switch (new1.getDisposeState()) {
        case Reg.OK:
            // Clicked Ok
            break;
        case Reg.CANCEL:
            // Clicked cancel or was closed by press [x]
            break;
    }
}

然后在reg类中，需要维护关于状态的信息······

public class Reg extends JDialog {
    public static final int OK = 0;
    public static final int CANCEL = 1;

    private int disposeState = CANCEL;

    //...

    public int getDisposeState() {
        return disposeState
    }

    public void setDisposeState(int state) {
        disposeState = state;
    }

然后你改变状态

// Why are you using a `MouseListener` on buttons??
// User use keyboards to, use an ActionListener instead
public void mouseClicked(MouseEvent e) {
    setDisposeState(CANCEL);
    dialog.dispose();
    System.out.println("Reg disposed by cancel button");
}

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