couple of questions on this simple calculator

[System_Error]

Right now, I've just got the interface of the calculator. It's not too great and that's one thing I would like help with, any improvements will do. Also, the biggest thing I need help with, is the textfield. If you look at other calculators, you see they go right to left, instead of left to right. How can I do this? Another thing, I tried the setMaximizable(false) method, and it didn't work.

Hope I'm not asking to much.

[System_Error]

I guess it would help if you had the code!

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Calculator extends JFrame implements ActionListener
{
	JButton[] btnNums;
	JButton btnBack;
	JButton btnClear;
	JButton btnCalculate;
	
	JTextField txtDisplay;
	
	public Calculator()
	{
		Container content = getContentPane();
		setSize(210,250);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		
		/*  construct a JPanel and the textfield that 
		 *  will show the inputed values and outputed 
		 *  results
		 */
		JPanel jpDisplay = new JPanel();
		jpDisplay.setLayout(new BorderLayout());
		txtDisplay = new JTextField(15);
		jpDisplay.add(txtDisplay);
		
		/*  contstruct a JPanel that will contain a back
		 *  button and a clear button.
		 */
		JPanel jpRow2 = new JPanel();
		btnBack = new JButton("Backspace");
		btnClear = new JButton("Clear");
		jpRow2.add(btnBack);
		jpRow2.add(btnClear);
		
		/*  construct a string array with all the names of the
		 *  buttons, then in a for loop create the new buttons
		 *  and add their name and an actionListener to them.
		 */
		String[] strNames = {"7","8", "9","/", "4", "5", "6","*", "1", "2", "3","+", "0", "+/-", ".", "-"};
		btnNums = new JButton[16];
		JPanel jpButtons = new JPanel();
		jpButtons.setLayout(new GridLayout(4,4));
		
		  for (int i = 0; i < 16; i++)
		  {
			  btnNums[i] = new JButton(strNames[i]);
			  btnNums[i].addActionListener(this);
			  jpButtons.add(btnNums[i]);
		  }
		  
		  /*  construct the final JPanel and add a 
		   *  calculate button to it.
		   */
		  JPanel jpLastRow = new JPanel();
		  btnCalculate = new JButton("Calculate");
		  jpLastRow.add(btnCalculate);
		  
		  /*  set the contentPane and create the layout
		   *  add the panels to the container
		   */
		  setContentPane(content);
		  setLayout(new FlowLayout());
		  content.add(jpDisplay, BorderLayout.NORTH);
		  content.add(jpRow2);
		  content.add(jpButtons);
		  content.add(jpLastRow);
		  setTitle("Mini Calculator");
		  setVisible(true); 
		  
	}
	
	public void actionPerformed(ActionEvent ae)
	{
	}
	
	public static void main(String[] args)
	{
		Calculator calc = new Calculator();
	}
}

[manavo11]

For the alignment, this came up in my search : http://www.it.bton.ac.uk/staff/je/ja...TextField.html

[manavo11]

Never mind with that...

TF.setHorizontalAlignment(JTextField.RIGHT);

[manavo11]

To disable the maximizing you can do this :

setResizable(false);

that will disable all resizing (including maximizing). But I'm not sure it disabling all resizing is what you want

[System_Error]

ahhh thank you manova!!

[manavo11]

ahhh thank you manova!!

You're welcome

*manavo

[System_Error]

Hey, one more thing! How does the layout/interface look? Does anything need to be changed or added?

[manavo11]

Hey, one more thing! How does the layout/interface look? Does anything need to be changed or added?

Something that might be useful is a square root button, it's common

Also, as a side note, when I tried to run it I got this note :

Exception in thread "main" java.lang.Error: Do not use Calculator.setLayout() us
e Calculator.getContentPane().setLayout() instead
at javax.swing.JFrame.createRootPaneException(JFrame.java:465)
at javax.swing.JFrame.setLayout(JFrame.java:531)
at Calculator.<init>(Calculator.java:65)
at Calculator.main(Calculator.java:81)

Which of course was fixed by changing this line :

setLayout(new FlowLayout());

to :

getContentPane().setLayout(new FlowLayout());

as it suggested

[System_Error]

hmm I didn't get that error. Im running 1.5, so that's probably why.

[manavo11]

hmm I didn't get that error. Im running 1.5, so that's probably why.

That would probably explain it, I have 1.4.2