Re: How do I know which choice box has been selected?

From:
"j.b.allwork@mmu.ac.uk" <j.b.allwork@mmu.ac.uk>
Newsgroups:
comp.lang.java.help
Date:
19 Feb 2007 07:15:18 -0800
Message-ID:
<1171898118.613426.147290@a75g2000cwd.googlegroups.com>
On 19 Feb, 14:56, "Andrew Thompson" <andrewtho...@gmail.com> wrote:

On Feb 20, 12:48 am, "j.b.allw...@mmu.ac.uk" <j.b.allw...@mmu.ac.uk>

(post reorganised to suit my reply)

Why doesn't my line of code:
strChoiceName = (String)e.getSource();
 do anything?


Excuse me? If the version of the JVM/SDK
does not do 'anything' it is obviously broken.

Always copy/paste specific error messages,
rather than provide a vague and incomplete
description of the result.
..

..Can you give me an example?


<sscce>
import java.awt.*;
import java.awt.event.*;

class ChoiceTest extends Panel implements ItemListener {

  TextArea ta;

  ChoiceTest() {
    super(new BorderLayout());
    ta = new TextArea();
    add( ta, BorderLayout.CENTER );

    Panel p = new Panel( new GridLayout() );
    add(p, BorderLayout.NORTH );
    for (int ii=0; ii<5; ii++) {
      Choice choice = new Choice();
      choice.addItemListener(this);
      for (int jj=0; jj<10; jj++) {
        choice.add( "Ch.: " + ii + " item: " + jj );
      }
      p.add(choice);
    }
  }

  public void itemStateChanged(ItemEvent ie) {
    ta.append( ie.getSource().toString() + "\n" );
  }

  public static void main(String[] args) {
    Frame f = new Frame("Choice Test");
    ChoiceTest ct = new ChoiceTest();
    f.add( ct );
    f.pack();

    f.addWindowListener( new WindowAdapter(){
      public void windowClosing(WindowEvent we) {
        System.exit(0);
      }
    } );

    f.setVisible(true);
  }}

</sscce>

Andrew T.


Hi Andrew

Thanks

I can find out which one if I use:
strChoiceName = e.getSource().toString();

instead of strChoiceName = (String)e.getSource();

John

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