Re: AWT simple questions

From:

"Andrew Thompson" <u32984@uwe>

Newsgroups:

comp.lang.java.programmer

Date:

Thu, 02 Aug 2007 00:47:09 GMT

Message-ID:

<76118dda08d2f@uwe>

Thomas wrote:

Hello, I am writing a simple calculator in AWT/java and I have question
regarding it. I have to put around the buttons on container/palete in nice
way. Don't know how to do it, I looked throught the api, ..

You need to be going through the layout tutorial.
<http://www.google.com/search?q=java+tutorial+layout>

..but I am looing for
the simplest way.

Here is the simplest way to layout a calculator
keypad..

<sscce>
import java.awt.*;

class CalculatorKeypad extends Panel {

  String[] num = {
    "7","8","9","/",
    "4","5","6","*",
    "1","2","3","-",
    "0",".","=","+",
  };

  public CalculatorKeypad() {

    // adjust spacing (last two numbers) to suit need..
    super(new GridLayout(4,0,5,5));

    Button b;
    for (int ii=0; ii<num.length; ii++) {
      b = new Button(num[ii]);
      add(b);
    }
  }

  public static void main(String[] args) {
    Frame f = new Frame("Calculator");
    f.setLayout( new BorderLayout(5,5) );

    CalculatorKeypad ck = new CalculatorKeypad();
    f.add( ck, BorderLayout.CENTER );

    Label output = new Label("Result goes here..");
    output.setBackground(Color.black);
    output.setForeground(Color.white);
    f.add( output, BorderLayout.NORTH );

    f.pack();

    f.setVisible(true);
  }
}
</sscce>

Note the layout is exactly the same for Swing
based components (JButton, JFrame, JPanel
and JLabel). Most modern day projects would
be using Swing for these components.

--
Andrew Thompson
http://www.athompson.info/andrew/

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