Java Reference
In-Depth Information
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 ;
}
If you recompile
Sketcher
once more, you can run the application again to try out the menus. If you
extend the
File
menu, you will see that it has the menu items that we have added.
