如何在ActionListener中退出方法

Question

我已ActionListener连接到，JTextField并且想要输入一些内容，以便它退出其中的方法ActionListener。

码：

main() {
    Security(x,x,x);
}
public void Security(JTextArea out, JTextField in) {
        in.setText("");
        in.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent ae) {
                if (in.getText().contains("exitsys")) {
                    out.append("Security:Security System Deactivated\n");
                    return;
                }
                in.setText("");
            }
        });
        out.append("Security:Security System Activated\n");
        fileWrite(":SYSTEM_INITIATED@" + time(), out);
    }

我想输入"exitsys"并返回主类方法"main()"。

该fileWrite方法使用a PrintWriter输出数据。

问题摘要：我尝试调用return；但它不会返回方法main（），我该如何解决？

Answer 1

基本上，您需要的是某种模式对话框，通过该对话框，您可以有效地在显示对话框的那一点上暂停程序的执行，直到关闭（关闭）该对话框为止，然后继续执行…

import java.awt.EventQueue;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class Test {

    public static void main(String[] args) {
        new Test();
    }

    public Test() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                    ex.printStackTrace();
                }

                JDialog dialog = new JDialog();
                dialog.setTitle("Testing");
                dialog.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
                dialog.add(new TestPane());
                dialog.pack();
                dialog.setLocationRelativeTo(null);
                dialog.setVisible(true);

                System.out.println("Now back in the main...");
            }
        });
    }

    public class TestPane extends JPanel {

        private JTextField field;

        public TestPane() {

            setLayout(new GridBagLayout());

            field = new JTextField(10);
            field.addActionListener(new ActionListener() {

                @Override
                public void actionPerformed(ActionEvent e) {
                    if ("exitsys".equals(field.getText())) {
                        SwingUtilities.getWindowAncestor(field).dispose();
                    }
                }
            });

            add(field);

        }

    }

}

有关更多详细信息，请参见如何制作对话框