Need help with Booleans and if and else

Dev Shed Forums Sponsor:

June 27th, 2012, 09:52 PM

xbeeceaz

Registered User

Join Date: Jun 2012

Posts: 2

Time spent in forums: 28 m 27 sec
Reputation Power: 0

Swing - Need help with Booleans and if and else

import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.Insets;
import java.awt.Event.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.*;

import javax.swing.*;

public class GUIBasedCalc extends JFrame implements ActionListener{
public GUIBasedCalc() {
super("Calculator");
setSize(200, 400);
setResizable(false);
super.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
super.setVisible(true);
int number1;
int number2;
boolean num1; //the booleans i need **HELP** with, **HELP** does final make the boolean unchangable (for ex: false to true)
boolean num2;
boolean operater;
JPanel dis = new JPanel();
JPanel sign = new JPanel();
JPanel nums = new JPanel();
JPanel nums1 = new JPanel();
JPanel nums2 = new JPanel();
GridLayout calc = new GridLayout(1, 3);
GridLayout calc1 = new GridLayout(1, 3);
GridLayout calc2 = new GridLayout(1, 3);
GridLayout sign1 = new GridLayout(1, 3);
FlowLayout lay = new FlowLayout();
setLayout(lay);
final JTextArea disply = new JTextArea(1, 8);
disply.setEditable(false);
JButton one = new JButton("1");
//Add action listener to button
one.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e)
{
if (num1 == true) { //wants me to make the boolean a final, but i still need to change it **HELP**
disply.setText("1");
int number1 = 1;
this.num1 = false; // changing the boolean to false **HELP**

} else if (operater = true){
disply.setText("Please choose an operater");
if (operater = false) {
disply.setText("1");
int number2 = 2;
this.num2 = false; //trying to change boolean to false **HELP**
}
}

}
});

thats my code, please help me thanks

how i feel when it does not work

June 28th, 2012, 06:40 AM

NormR

Contributing User

Join Date: Aug 2010

Location: Eastern Florida

Posts: 2,951

Time spent in forums: 1 Week 6 Days 2 h 29 m 42 sec
Reputation Power: 345

Please explain what the problems are. What does the code do or not do that you are having problems with? Post the full text of any error messages here.

Can you edit the post and wrap the code in code tags to preserve formatting?

June 28th, 2012, 07:23 AM

leo2012

Contributing User

Join Date: Jun 2012

Posts: 50

Time spent in forums: 1 Day 17 h 24 m 13 sec
Reputation Power: 1

If you make boolean as final you can not change the value using mathods. Default boolean value is FALSE

I did some corrections hope this help !

Code:

import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.Insets;
import java.awt.Event.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.*;


import javax.swing.*;

public class GUIBasedCalc extends JFrame implements ActionListener{
	
	private int number1 =0;
	private int number2 =0;
	private boolean num1 =true; //the booleans i need **HELP** with, **HELP** does final make the boolean unchangable (for ex: false to true)
	private boolean num2 =true; 
	private boolean operater  =true; 
	
	public GUIBasedCalc() {
		super("Calculator");
		setSize(200, 400);
		setResizable(false); 
		super.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
		super.setVisible(true);
		
		JPanel dis = new JPanel(); 
		JPanel sign = new JPanel(); 
		JPanel nums = new JPanel();
		JPanel nums1 = new JPanel();
		JPanel nums2 = new JPanel();
		GridLayout calc = new GridLayout(1, 3);
		GridLayout calc1 = new GridLayout(1, 3);
		GridLayout calc2 = new GridLayout(1, 3);
		GridLayout sign1 = new GridLayout(1, 3); 
		FlowLayout lay = new FlowLayout(); 
		setLayout(lay); 
		final JTextArea disply = new JTextArea(1, 8);
		disply.setEditable(false); 
		JButton one = new JButton("1");
		//Add action listener to button
		one.addActionListener(new ActionListener() {

			public void actionPerformed(ActionEvent e)
			{
				if (num1 == true) { //wants me to make the boolean a final, but i still need to change it **HELP**
					disply.setText("1"); 
					number1 = 1; 
					num1 = false; // changing the boolean to false **HELP**

				} else if (operater = true){
					disply.setText("Please choose an operater"); 
					if (operater = false) {
						disply.setText("1"); 
						 number2 = 2; 
						num2 = false; //trying to change boolean to false **HELP**
					}
				}

			}
		});
		
	}

	@Override
	public void actionPerformed(ActionEvent arg0) {
		// TODO Auto-generated method stub
		
	}}

July 3rd, 2012, 01:45 AM

Wetmelon

Contributing User

Join Date: Oct 2009

Location: London, ON

Posts: 322

Time spent in forums: 3 Days 9 h 32 m 53 sec
Reputation Power: 213

Posted this in the other thread you created (which should probably be closed):

Please post your code in code tags to preserve formatting. Also, I'm confused by your variable names. Why is "Num1" a boolean? is it a boolean or a number?

Also, this line:

Code:

else if (operater = true)

isn't doing what you think it's doing.

You're going to have to explain what you're trying to accomplish and what is occurring that is not desirable.

__________________
<Tetrad> the program I just wrote 1) compiled the first time without any errors and 2) worked like it was supposed to
<Tetrad> I don't know whether to be proud or scared to death

Quote:

Originally Posted by DaWei_M

That covers a multitude of your sins, right there.

Swing - Need help with Booleans and if and else

Developer Shed Advertisers and Affiliates