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81 lines
2.7 KiB
Java
81 lines
2.7 KiB
Java
MenuDemo.java
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// Title : MenuDemo.java - Simple demo of building menus.
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import java.awt.*;
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import java.awt.event.*;
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import javax.swing.*;
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import javax.swing.event.*;
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/// MenuDemo
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public class MenuDemo {
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main
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public static void main(String[] args) {
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JFrame win = new MenuDemoGUI();
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win.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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win.setVisible(true);
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}
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}
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///// MenuDemoGUI
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class MenuDemoGUI extends JFrame {
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JTextArea m_editArea = new JTextArea(20, 50);;
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JMenu m_fileMenu = new JMenu("File");// declare and create new menu
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JMenuItem m_openItem = new JMenuItem("Open"); // create new menu item
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JMenuItem m_quitItem = new JMenuItem("Quit"); // another menu item
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JMenu m_editMenu = new JMenu("Edit");
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JMenuItem m_copyItem = new JMenuItem("Copy");
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JMenuItem m_pasteItem= new JMenuItem("Paste");
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constructor
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public MenuDemoGUI() {
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//... Add listeners to menu items
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m_openItem.addActionListener(new OpenAction());
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m_quitItem.addActionListener(new QuitAction());
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// Copy and Paste don't have listeners yet, so disable them for now.
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m_copyItem.setEnabled(false);
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m_pasteItem.setEnabled(false);
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//... Menubar, menus, menu items. Use indentation to show structure.
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JMenuBar menubar = new JMenuBar(); // declare and create new menu bar
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menubar.add(m_fileMenu); // add the menu to the menubar
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m_fileMenu.add(m_openItem); // add the menu item to the menu
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m_fileMenu.addSeparator(); // add separator line to menu
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m_fileMenu.add(m_quitItem);
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menubar.add(m_editMenu);
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m_editMenu.add(m_copyItem);
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m_editMenu.add(m_pasteItem);
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//... Content pane: create, layout, add components
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JPanel content = new JPanel();
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content.setLayout(new BorderLayout());
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content.add(m_editArea, BorderLayout.CENTER);
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//... Set JFrame's menubar, content pane, and title.
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this.setContentPane(content); // Set windows content pane..
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this.setJMenuBar(menubar); // Set windows menubar.
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this.pack();
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this.setTitle("MenuDemo");
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}//endconstructor
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//// OpenAction
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class OpenAction implements ActionListener {
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public void actionPerformed(ActionEvent e) {
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JOptionPane.showMessageDialog(null, "Sorry, can't open anything");
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}
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}
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/// QuitAction
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class QuitAction implements ActionListener {
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public void actionPerformed(ActionEvent e) {
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System.exit(0); // terminate this program
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}
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}
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}
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