Java Swing Tutorial - Java JMenu.addSeparator()

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Syntax

JMenu.addSeparator() has the following syntax.

public void addSeparator()

Example

In the following code shows how to use JMenu.addSeparator() method.

//from   w  ww .  j  ava2 s  . c o m

import java.awt.Event;

import javax.swing.ButtonGroup;
import javax.swing.JCheckBoxMenuItem;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JRadioButtonMenuItem;
import javax.swing.KeyStroke;

public class Main extends JFrame {

  public Main() {
    setDefaultCloseOperation(EXIT_ON_CLOSE);

    setJMenuBar(menuBar);

    JMenu fileMenu = new JMenu("File");
    JMenu elementMenu = new JMenu("Elements");
    fileMenu.setMnemonic('F');
    elementMenu.setMnemonic('E');

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

    JMenu colorMenu = new JMenu("Color");

    fileMenu.addSeparator();
    printItem = fileMenu.add("Print");

    newItem.setAccelerator(KeyStroke.getKeyStroke('N', Event.CTRL_MASK));
    openItem.setAccelerator(KeyStroke.getKeyStroke('O', Event.CTRL_MASK));
    saveItem.setAccelerator(KeyStroke.getKeyStroke('S', Event.CTRL_MASK));
    printItem.setAccelerator(KeyStroke.getKeyStroke('P', Event.CTRL_MASK));

    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);

    lineItem.setAccelerator(KeyStroke.getKeyStroke('L', Event.CTRL_MASK));
    rectangleItem.setAccelerator(KeyStroke.getKeyStroke('E', Event.CTRL_MASK));
    circleItem.setAccelerator(KeyStroke.getKeyStroke('I', Event.CTRL_MASK));
    curveItem.setAccelerator(KeyStroke.getKeyStroke('V', Event.CTRL_MASK));

    elementMenu.addSeparator();

    elementMenu.add(colorMenu); // Add the sub-menu
    colorMenu.add(redItem = new JCheckBoxMenuItem("Red", false));
    colorMenu.add(yellowItem = new JCheckBoxMenuItem("Yellow", false));
    colorMenu.add(greenItem = new JCheckBoxMenuItem("Green", false));
    colorMenu.add(blueItem = new JCheckBoxMenuItem("Blue", true));

    // Add element color accelerators
    redItem.setAccelerator(KeyStroke.getKeyStroke('R', Event.CTRL_MASK));
    yellowItem.setAccelerator(KeyStroke.getKeyStroke('Y', Event.CTRL_MASK));
    greenItem.setAccelerator(KeyStroke.getKeyStroke('G', Event.CTRL_MASK));
    blueItem.setAccelerator(KeyStroke.getKeyStroke('B', Event.CTRL_MASK));

    menuBar.add(fileMenu);
    menuBar.add(elementMenu);
  }

  private JMenuBar menuBar = new JMenuBar();

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

  // Element menu items
  private JRadioButtonMenuItem lineItem, rectangleItem, circleItem, curveItem,
      textItem;

  private JCheckBoxMenuItem redItem, yellowItem, greenItem, blueItem;

  public static void main(String[] args) {
    JFrame aWindow = new Main();
    aWindow.setSize(200,200);
    aWindow.setVisible(true);
  }
}

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