Tuesday, March 13, 2007

Java Calculator GUI Lab

hey guys,
finally finished it and it works fine.. if you want some simpler code then what i'd seen on the other forum ... use mine.

i did all of this straight from the lecture notes so there shouldn't be anything too confusing
but i will admit it took me a WHILE to get this working.. rusty i guess.. heh..
later
Jake


import javax.swing.*;
import java.awt.FlowLayout;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.*;
import javax.swing.JFrame ;

public class MenuJFrame
extends JFrame
implements ActionListener
{
public static final int WIDTH = 600;
public static final int HEIGHT = 400;

// without putting these here, they are unaccessable by the actionlistener
private JPanel westPanel;
private JPanel eastPanel;
private JTextField one;
private JTextField two;
private JTextField answer;


public MenuJFrame()
{
//main window

super("Java Calculator");
this.setSize(WIDTH,HEIGHT);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setLayout(new GridLayout(0,2));

//west panel

westPanel = new JPanel();
westPanel.setLayout(new GridLayout(3,0));
this.add(westPanel);

//east panel

eastPanel = new JPanel();
eastPanel.setLayout(new GridLayout(4,0));
this.add(eastPanel);


//text fields

one = new JTextField(30);
two = new JTextField(30);


westPanel.add(one);
westPanel.add(two);

//answer

answer = new JTextField("0.0");

//non-editable text field

answer.setEditable(false);
westPanel.add(answer);

//buttons for east
JButton add = new JButton("+");
JButton subtract = new JButton("-");
JButton multiply = new JButton("*");
JButton divide = new JButton("/");

//add buttons to eastPanel

eastPanel.add(add);

add.addActionListener(this);


eastPanel.add(subtract);

subtract.addActionListener(this);

eastPanel.add(multiply);

multiply.addActionListener(this);

eastPanel.add(divide) ;

divide.addActionListener(this);

//Menu Bar

//create a new menubar , this is ONLY the grey bar at the top w/ nothing in it!!!
JMenuBar myMenuBar = new JMenuBar();

//this.setJMenuBar is a method which auto positions the menu bar @ the top
this.setJMenuBar(myMenuBar);

//create two fields, File and Clear.
JMenu File = new JMenu("File");

JMenu Clear = new JMenu("Clear");

//create a menuItem quit
JMenuItem quit = new JMenuItem("Quit");

//add action listener to quit, so the program quits when clicked
quit.addActionListener(this);

// add quit to the file menu
File.add(quit);

//create menu items for clearing the fields
JMenuItem clearA = new JMenuItem("Clear A");
JMenuItem clearB = new JMenuItem("Clear B");
JMenuItem wipe = new JMenuItem("Clear All");

//add action listeners for each
clearA.addActionListener(this);
clearB.addActionListener(this);
wipe.addActionListener(this);

// add all three menu items to the menu 'Clear'
Clear.add(clearA);
Clear.add(clearB);
Clear.add(wipe);

// add file and clear to the menu bar
myMenuBar.add(File);
myMenuBar.add(Clear);






}


//ActionListener


public void actionPerformed(ActionEvent e)
{
String cmd = e.getActionCommand();

//if the button is '+' then add the two fields and display answer in bottom box
if (cmd == "+")
{
answer.setText((Double.toString((Double.parseDouble(one.getText())) + (Double.parseDouble(two.getText())))));
}

//if the button is '-' then subtract the two fields and display answer in bottom box
if (cmd == "-")
{
answer.setText((Double.toString((Double.parseDouble(one.getText())) - (Double.parseDouble(two.getText())))));
}

//if the button is '*' then multiply the two fields and display answer in bottom box
if (cmd == "*")
{
answer.setText((Double.toString((Double.parseDouble(one.getText())) * (Double.parseDouble(two.getText())))));
}

//if the button is "/" then divide the two fields and display answer in bottom box
if (cmd == "/")
{
answer.setText((Double.toString((Double.parseDouble(one.getText())) / (Double.parseDouble(two.getText())))));
}

//if button is "Quit" then close the program
if (cmd == "Quit")
{
System.exit(0);
}

// if button is 'Clear A' then clear A
if (cmd == "Clear A")
{
one.setText("");
}

// if button is 'Clear B' then clear B
if (cmd == "Clear B")
{
two.setText("");
}

// if button is 'Clear All' then clear all fields and leave 0.0 in the answer field
if (cmd == "Clear All")
{
one.setText("");
two.setText("");
answer.setText("0.0");
}




}



}

public class JavaCalculator
{
public static void main(String[] args)
{
MenuJFrame MyWindow = new MenuJFrame();
MyWindow.setVisible (true);

}

}

3 comments:

K said...

good job

Anonymous said...

Did you start on the latest lab? I was wondering if you knew how to delete a single element from a linked list. Thanks in advance.

Dyllis said...

Good post.