java - 如何通过单击第一个java Windows应用程序(Jframe)中的菜单项启动第二个Jframe

Question

我正在使用 Eclipse 4.2 和 Java。

我有2个java程序:AppWin.java Form1.java

AppWin.java 是带有 menu/menu item1 的 GUI Windows 应用程序。

Form1.java 是一个 Gui Jframe

我喜欢通过单击menu/menu item1从AppWin.java调用Form1.java。关闭Form1.java后，又回到AppWin.java。

这类似于MDIFORM。我实在找不到答案。如果您知道 eclipse 菜单，请帮忙。

谢谢

package top;

import java.awt.EventQueue;

public class AppWin {

    private JFrame frame;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    AppWin window = new AppWin();
                    window.frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

...

在你的帮助下，我迈出了一大步。谢谢大家!

接下来是我的最终演示，在 Windows 7、Eclipse 4.2、Java Gui 中希望对其他人有帮助。

共有3部分:AppWin，Form1，Form2。 AppWin 是顶级主程序，它通过菜单/项目调用 Form1 和 Form2。

//1
package top;

import java.awt.EventQueue;

public class AppWin {

    private JFrame frame;

    private Form1 form1;
    private Form2 form2;
    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    AppWin window = new AppWin();
                    window.frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the application.
     */
    public AppWin() {
        initialize();
        form1 = new Form1();
        form2 = new Form2();
    }

    /**
     * Initialize the contents of the frame.
     */
    private void initialize() {
        frame = new JFrame();
        frame.setBounds(100, 100, 450, 300);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JMenuBar menuBar = new JMenuBar();
        frame.setJMenuBar(menuBar);

        JMenu mnNewMenu = new JMenu("Menu1");
        menuBar.add(mnNewMenu);

        JMenuItem mntmNewMenuItem = new JMenuItem("menu item1");
        mntmNewMenuItem.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                form1.setVisible(true);
            }
        });
        mnNewMenu.add(mntmNewMenuItem);

        JMenuItem mntmNewMenuItem_1 = new JMenuItem("menu item2");
        mntmNewMenuItem_1.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                form2.setVisible(true);
            }
        });
        mnNewMenu.add(mntmNewMenuItem_1);

        JMenu mnNewMenu_1 = new JMenu("Menu2");
        menuBar.add(mnNewMenu_1);

        JMenuItem mntmMenuItem = new JMenuItem("Menu item3");
        mnNewMenu_1.add(mntmMenuItem);
    }

}

//2
package top;

import java.awt.BorderLayout;

public class Form1  extends JFrame {

    private JPanel contentPane;
    private JTextField textField;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    Form1 frame = new Form1();
                    frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the frame.
     */
    public Form1() {
//      setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 450, 300);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        contentPane.setLayout(new BorderLayout(0, 0));
        setContentPane(contentPane);

        JLabel lblNewLabel = new JLabel("this Form1");
        contentPane.add(lblNewLabel, BorderLayout.WEST);

        textField = new JTextField();
        contentPane.add(textField, BorderLayout.CENTER);
        textField.setColumns(10);

        JButton btnNewButton = new JButton("New button");
        contentPane.add(btnNewButton, BorderLayout.EAST);
    }

}

//3
package top;

import java.awt.BorderLayout;

public class Form2 extends JDialog {

    private final JPanel contentPanel = new JPanel();

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        try {
            Form2 dialog = new Form2();
            dialog.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
            dialog.setVisible(true);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * Create the dialog.
     */
    public Form2() {
        setBounds(100, 100, 450, 300);
        getContentPane().setLayout(new BorderLayout());
        contentPanel.setLayout(new FlowLayout());
        contentPanel.setBorder(new EmptyBorder(5, 5, 5, 5));
        getContentPane().add(contentPanel, BorderLayout.CENTER);
        {
            JLabel lblThisForm = new JLabel("This Form2");
            contentPanel.add(lblThisForm);
        }
        {
            JPanel buttonPane = new JPanel();
            buttonPane.setLayout(new FlowLayout(FlowLayout.RIGHT));
            getContentPane().add(buttonPane, BorderLayout.SOUTH);
            {
                JButton okButton = new JButton("OK");
                okButton.setActionCommand("OK");
                buttonPane.add(okButton);
                getRootPane().setDefaultButton(okButton);
            }
            {
                JButton cancelButton = new JButton("Cancel");
                cancelButton.setActionCommand("Cancel");
                buttonPane.add(cancelButton);
            }
        }
    }

}

再次感谢

Answer 1

您最好使用 JDesktopPane + JInternalFrame 来实现此目的。这是一个快速示例。

    import java.awt.BorderLayout;
    import java.awt.Dimension;
    import java.awt.event.ActionEvent;

    import javax.swing.AbstractAction;
    import javax.swing.JDesktopPane;
    import javax.swing.JFrame;
    import javax.swing.JInternalFrame;
    import javax.swing.JMenu;
    import javax.swing.JMenuBar;
    import javax.swing.JMenuItem;
    import javax.swing.JPanel;

    public class JInternalFrameSample {

        private JPanel pnlMain;
        private JDesktopPane desk;

        public JInternalFrameSample(){
            pnlMain = new JPanel(new BorderLayout()){
                @Override public Dimension getPreferredSize(){
                    return new Dimension(600,600);
                }
            };
            desk = new JDesktopPane();

            JMenuBar bar = new JMenuBar();
            JMenu menu = new JMenu("Internal Frame");
            JMenuItem item = new JMenuItem();

            item.setAction(new AbstractAction("Create New") {
                @Override
                public void actionPerformed(ActionEvent arg0) {
                    JInternalFrame iFrame = new JInternalFrame("Created from Menu");
                    iFrame.setResizable(true);
                    iFrame.setClosable(true);
                    iFrame.setIconifiable(true);
                    iFrame.setSize(new Dimension(300, 300));
                    iFrame.setLocation(0, 0);

                    //iFrame.getContentPane().setLayout(new BorderLayout());
                    //iFrame.getContentPane().add( new YourCustomUI().getUI() );

                    iFrame.setVisible(true);
                    desk.add(iFrame);
                }
            });


            menu.add(item);
            bar.add(menu);

            pnlMain.add(bar, BorderLayout.PAGE_START);
            pnlMain.add(desk, BorderLayout.CENTER);
        }

        private JPanel getUI(){
            return pnlMain;
        }

        public static void main(String[] args){
            SwingUtilities.invokeLater(new Runnable() {
                public void run() {
                    JFrame frame = new JFrame("Demo");
                    frame.getContentPane().setLayout(new BorderLayout());
                    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                    frame.getContentPane().add(new JInternalFrameSample().getUI());
                    frame.pack();
                    frame.setVisible(true);
                }
            });
        }
    }

另请参阅:How to Use Internal Frames