Thread: ProgramMenuBar problems

I'm using the class ProgramMenuBar to make a Menu Bar that has print and will actually print.

However, while the options are there, they throw Null Pointer Exceptions when selected.

I have a big program I'm using, but you guys always want something smaller, so:

import java.awt.color.ColorSpace;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.AdjustmentEvent;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.KeyEvent;
import java.awt.event.MouseEvent;
 
import javax.swing.event.MenuEvent;
import javax.swing.event.MenuListener;
import javax.swing.event.PopupMenuEvent;
import javax.swing.event.PopupMenuListener;
import javax.swing.text.DefaultStyledDocument;
 
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
 
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.ScrollPaneConstants;
 
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
 
import java.util.*;
import java.io.*;
import javax.swing.ImageIcon;
 
 
import java.awt.event.WindowEvent;
import java.awt.Window;
import javax.swing.JScrollPane;
import java.awt.Component;
import javax.swing.JMenu;
import javax.swing.JMenuItem;
import acm.io.*;
import acm.graphics.*;
import acm.program.*;
import acm.gui.*;
import acm.util.*;
import java.awt.Container;
 
public class sampleClass extends JFrame
{
JPanel panel;
JMenu menu;
ProgramMenuBar bar;
 
public sampleClass()
{
setTitle("Title");
panel = new JPanel();
bar = new ProgramMenuBar();
menu = new JMenu();
panel.add(bar);
bar.add(menu);
bar.setVisible(true);
panel.setVisible(true);
menu.setVisible(true);
bar.addFileMenu();
bar.addFileMenuItems(menu);
bar.addEditMenu();
bar.addEditMenuItems(menu);
bar.init();
 
 
getContentPane.add(panel);
}
 
public static void main(String[] args)
{
sampleClass referenceVariable = new sampleClass();
referenceVariable.showGUI();
}
 
public void showGUI(){
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setSize(300,300);
		setLocation(100,100);
		setVisible(true);
	} 
}

How do I get the parts of the menu to work?

Originally Posted by Darryl.Burke

See #2 and #5

db

Ok, but what about saving? Is this a FileSaver class or something?

Also, my print job won't let me print select pages, say pages 1 -10 of a 20 page document. It only lets my do all the pages.

So tired, biked at least 16 miles.


Ok, I fixed the printing dilemma but how do you get it to save something, say a bunch of text fields, or a JTable being used as a sort of database, or just a plain regular file? Can you save a file as .exe?

Also, how may I ask is it possible for a method, not a method call but a method, to be inside the main method, or any other type of method for that matter? I've seen it and sometimes those programs actually compiled for me. I thought you could have inner classes but not inner methods. Did I learn it wrong?

Also, why does main have to have a String array as a parameter. Why not just a String, or even a String Vector, or some other variable even?

Is pretty much every class auto-implementing something, just like every class I make automatically extends Object if I don't tell it to extend something else, which by the way, that other class extends Object or is an ancestor. Speaking of which, what is an Ancestor Listener?

Is it

a.) A Listener that, say I push a button in window one and it opens window two; I then do something in window two and the Ancestor Listener makes something happen in window one

b.) A Listener that will use a Listener of a super class or one of it's ancestors

c.) A Listener that simply tells which Component called it.

d.) A Listener that shows your family tree

e.) A Listener that quite seriously has to do with the Java Tree classes.

f.) A Listener that somehow involves a JOptionPane and it's parent component.

g.) None of the above

h.) More than one of the above (please explain)

Anyway, does it auto-implement something that requires a main, something not required for some reason for JApplets, method.