What is the problem here?

Question

Hello,
First of all I am a beginner. But I thought it would be better to write this topic here rather than Beginner.
I have written a simple calculator program. But I have a problem with the interface. I created a Text Field (JTextField actually). And below this text field, buttons are placed.
The buttons consist of 4 rows and 4 colums (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, C, OK, *, +, -, /).
The problem is: the buttons (0, 4, 8, *) are in the width of the textField. Whatever length you enter for the textField, the length of the buttons changes.
I have used the GridBagLayout. Which one is more suitable for a job like this?
GridBagLayout or GridLayout?
I tried GridLayout also, which didn't work either.
In the code below, for the JLabel I used: fill constraint. as HORIZONTAL.
Does it make any sense? I also tried to use the fill constraint also for the textField. I used:
cons.fill = GridBagConstraints.FIRST_LINE_START
But it also didn't work. I am confused, I almost tried everything and couldn't get a satisfying result.
When I use GridLayout this time all the buttons take the length of textField area.
I used GridLayout(0,4,1,1).
Also while using the GridLayout if the windows is maximized then the shape of buttons and the textField also changes. Is there a way to stop this?
Here is the code:
  public void addComponentsToPane(Container pane) {
    if(LEFT_TO_RIGHT) {
      pane.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
    pane.setLayout(new GridBagLayout());
    GridBagConstraints cons = new GridBagConstraints();
    subtotal = 0;
    operator = new String("");
    stringvalue = new String("");
    label = new JLabel("Simple Calculator");
    cons.fill = GridBagConstraints.HORIZONTAL;
    cons.gridx = 0;
    cons.gridy = 0;
    pane.add(label, cons);
    textField = new JTextField(15);
    cons.gridx = 0;
    cons.gridy = 1;
    pane.add(textField, cons);
    zero = new JButton("0");
    zero.addActionListener(this);
    cons.gridx = 0;
    cons.gridy = 2;
    pane.add(zero, cons);
    one = new JButton("1");
    one.addActionListener(this);
    cons.gridx = 1;
    cons.gridy = 2;
    pane.add(one, cons);
    two = new JButton("2");
    two.addActionListener(this);
    cons.gridx = 2;
    cons.gridy = 2;
    pane.add(two, cons);
    three = new JButton("3");
    three.addActionListener(this);
    cons.gridx = 3;
    cons.gridy = 2;
    pane.add(three, cons);
    four = new JButton("4");
    four.addActionListener(this);
    cons.gridx = 0;
    cons.gridy = 3;
    pane.add(four, cons);
    five = new JButton("5");
    five.addActionListener(this);
    cons.gridx = 1;
    cons.gridy = 3;
  }Thanks in advance for your helps.

Answer 1

Although the GridBagLayout is extremely flexible it is also more complicated to use.
I prefer to use multiple LayoutManagers to get the effect I want. Maybe something like this:
http://forum.java.sun.com/thread.jspa?forumID=57&threadID=609795