j_popupmenu.java

一个十分好的java基础学习的课件

// ////////////////////////////////////////////////////////
// 
// J_PopupMenu.java
// 

// ////////////////////////////////////////////////////////

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;

public class J_PopupMenu extends JFrame
{
    private JPopupMenu m_popupMenu= new JPopupMenu( );

    public J_PopupMenu( )
    {
        super("Popup Menu Example");
        JMenu [] m = { new JMenu("File"), new JMenu("Edit") };
        char [] mC = { 'F', 'E' };
        JMenuItem [] [] mI =
        {
            {new JMenuItem("Save"), new JMenuItem("Print")},
            {new JMenuItem("Copy"), new JMenuItem("Read")}
        };
        char [] [] mIC = { {'S', 'P'}, {'C', 'R'}};
        int i, j;
        
        for (i= 0; i< m.length; i++)
        {
            m_popupMenu.add(m[i]);
            m[i].setMnemonic(mC[i]);
            for (j= 0; j< mI[i].length; j++)
            {
                m[i].add(mI[i][j]);
                mI[i][j].setMnemonic(mIC[i][j]);
                mI[i][j].addActionListener( new ActionListener( )
                    {
                        public void actionPerformed(ActionEvent e)
                        {
                            JMenuItem mItem= (JMenuItem)e.getSource( );
                            System.out.println("Run Menu Item: " + mItem.getText( ));
                        } // End of method: actionPerformed
                    } // End of the anonymous inner class, which implements ActionListener
                ); // End of invoking addActionListener
            } // End of inner loop: inner for
        } // End of inner loop: outer for

        addMouseListener( new MouseAdapter( )
            {
                public void mousePressed( MouseEvent e )
                {
                    if ( e.isPopupTrigger( ) ) 
                        m_popupMenu.show(e.getComponent( ), e.getX( ), e.getY( ) );
                } // End of method: mousePressed

                public void mouseReleased( MouseEvent e )
                {
                    mousePressed(e);
                } // End of method: mouseReleased
            } // End of the anonymous inner class, which implements MouseAdapter
        ); // End of invoking addMouseListener


        setSize(250, 120);
        setVisible(true);
    } // End of constructor: J_PopupMenu

    public static void main( String args[] )
    { 
        JFrame app = new J_PopupMenu( );

        Container cp = app.getContentPane( );
        app.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE );
    } // End of method: main

} // End of class: J_PopupMenu