sketchframe.java

Java Classic Examples是我买的两本书：《JAVA经典实例》和《java入门经典源代码》里边附送光盘里带的源码

// Frame for the Sketcher application
import javax.swing.*;

public class SketchFrame extends JFrame
{
  // Constructor
  public SketchFrame(String title)
  {
    setTitle(title);                              // Set the window title
    setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);

    setJMenuBar(menuBar);                         // Add the menu bar to the window

    JMenu fileMenu = new JMenu("File");           // Create File menu
    JMenu elementMenu = new JMenu("Elements");    // Create Elements menu

   // Construct the file pull down menu
    newItem = fileMenu.add("New");                // Add New item
    openItem = fileMenu.add("Open");              // Add Open item
    closeItem = fileMenu.add("Close");            // Add Close item
    fileMenu.addSeparator();                      // Add separator
    saveItem = fileMenu.add("Save");              // Add Save item
    saveAsItem = fileMenu.add("Save As...");      // Add Save As item
    fileMenu.addSeparator();                      // Add separator
    printItem = fileMenu.add("Print");            // Add Print item

    // Construct the Element pull down menu
    elementMenu.add(lineItem = new JRadioButtonMenuItem("Line", true));
    elementMenu.add(rectangleItem = new JRadioButtonMenuItem("Rectangle", false));
    elementMenu.add(circleItem = new JRadioButtonMenuItem("Circle", false));
    elementMenu.add(curveItem = new JRadioButtonMenuItem("Curve", false));
    ButtonGroup types = new ButtonGroup();
    types.add(lineItem);
    types.add(rectangleItem);
    types.add(circleItem);
    types.add(curveItem);

    elementMenu.addSeparator();

    elementMenu.add(redItem = new JCheckBoxMenuItem("Red", false));
    elementMenu.add(yellowItem = new JCheckBoxMenuItem("Yellow", false));
    elementMenu.add(greenItem = new JCheckBoxMenuItem("Green", false));
    elementMenu.add(blueItem = new JCheckBoxMenuItem("Blue", true));

    menuBar.add(fileMenu);                        // Add the file menu
    menuBar.add(elementMenu);                     // Add the element menu
  }

  private JMenuBar menuBar = new JMenuBar();      // Window menu bar

  // File menu items
  private JMenuItem newItem,  openItem,   closeItem,
                    saveItem, saveAsItem, printItem;

  // Element menu items
  private JRadioButtonMenuItem lineItem,  rectangleItem, circleItem,  // Types
                               curveItem, textItem;
  private JCheckBoxMenuItem    redItem,   yellowItem,                 // Colors
                               greenItem, blueItem ;  
}