What is the use of JMenu class?

[Prashobh Mallu]

Hi All,

I am quit confused about the some concepts of java language. For me the class concepts of the java seems very difficult to understand as compare to C++ programming. A 'JMenu class' is one of them. I don't have any idea about the use of JMenu class from the advanced java. So if you have sound knowledge about the JMenu class, then please let me know that. I would appreciate your any help over 'JMenu class'.

[MindSpace]

Hi,

The JMenu class is used for the implementation of menu. In addition to JMenuItems, a JMenu can also contain JSeparators. In essence, a menu is a button with an associated JPopupMenu. When the "button" is pressed, the JPopupMenu appears. If the "button" is on the JMenuBar, the menu is a top-level window. If the "button" is another menu item, then the JPopupMenu is "pull-right" menu.

[Modifier]

Hi Friend,

Please review following example of 'JMenu class'. This java program code will demonstrate you the use of JMenu class along with it's methods:

import javax.swing.JSeparator;
import javax.swing.JMenu;

public class JMenuDemo1 extends JFrame 
{
  public JMenuDemo1() {
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JMenuBar barT = new JMenuBar();
    JMenu menuT = new JMenu("File");
    barT.add(menuT);

    menuT.add(new JMenuItem("Close"));
    menuT.add(new JSeparator()); 
    menuT.add(new JMenuItem("Exit"));

    setJMenuBar(barT);
    getContentPane().add(new JLabel("A placeholder"));

    pack();
    setSize(400, 300);
    setVisible(true);
  }

  public static void main(String arg[]) {
    new JMenuDemo1();
  }
}

[Praetor]

To use properties of JMenu class of class, for that you should be aware about following it's methods:

• setPopupMenuVisible(boolean bln)
• setModel(ButtonModel newMdl)
• setMenuLocation(int x01, int y01)
• setComponentOrientation(ComponentOrientation cmporn)
• setAccelerator(KeyStroke ksk)
• processKeyEvent(KeyEvent kevt)

[Katty]

Hello friend,

See if something below code can help you to know about JMenu class or not:

JMenuItem newMenuItem01 = new JMenuItem("New");
fileMenu.add(newMenuItem01);

JMenuItem openMenuItem01 = new JMenuItem("Open");
fileMenu.add(openMenuItem01);

JMenuItem closeMenuItem01 = new JMenuItem("Close");
fileMenu.add(closeMenuItem01);
fileMenu.addSeparator();

JMenuItem saveMenuItem01 = new JMenuItem("Save");
fileMenu.add(saveMenuItem01);
fileMenu.addSeparator();

JMenuItem exitMenuItem01 = new JMenuItem("Exit");
fileMenu.add(exitMenuItem01);

[kelfro]

Please review following constructors of JMenu class which are used to create menu. While the type of JMenu is depends upon parameters which are supplied to it's constructors:

1. JMenu(String st, boolean bln): This constructor of JMenu is used for the creation of a new JMenu with the apecified string as a text.
2. JMenu(String st): This constructor of JMenu is used for the creation of a JMenu using given string.
3. JMenu(Action ac): This constructor of JMenu is used for the creation of a JMenu fpr which action proerties are Action supplied.
4. JMenu(): This constructor of JMenu is used for the creation menu without any text.