Radio buttons

Bruce Eckel's Thinking in Java Contents | Prev | Next

//: RadioButton1.java
// Using radio buttons
import java.awt.*;
import java.applet.*;
 
public class RadioButton1 extends Applet {
  TextField t = 
    new TextField("Radio button 2", 30);
  CheckboxGroup g = new CheckboxGroup();
  Checkbox 
    cb1 = new Checkbox("one", g, false),
    cb2 = new Checkbox("two", g, true),
    cb3 = new Checkbox("three", g, false);
  public void init() {
    t.setEditable(false);
    add(t); 
    add(cb1); add(cb2); add(cb3); 
  }
  public boolean action (Event evt, Object arg) {
    if(evt.target.equals(cb1))
      t.setText("Radio button 1");
    else if(evt.target.equals(cb2))
      t.setText("Radio button 2");
    else if(evt.target.equals(cb3))
      t.setText("Radio button 3");
    else 
      return super.action(evt, arg);
    return true;
  }
} ///:~ 

To display the state, an text field is used. This field is set to non-editable because it’s used only to display data, not to collect it. This is shown as an alternative to using a Label. Notice the text in the field is initialized to “Radio button 2” since that’s the initial selected radio button.

You can have any number of CheckboxGroups on a form.



Comments

  • There are no comments yet. Be the first to comment!

Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • Live Event Date: October 29, 2014 @ 11:00 a.m. ET / 8:00 a.m. PT Are you interested in building a cognitive application using the power of IBM Watson? Need a platform that provides speed and ease for rapidly deploying this application? Join Chris Madison, Watson Solution Architect, as he walks through the process of building a Watson powered application on IBM Bluemix. Chris will talk about the new Watson Services just released on IBM bluemix, but more importantly he will do a step by step cognitive …

  • Packaged application development teams frequently operate with limited testing environments due to time and labor constraints. By virtualizing the entire application stack, packaged application development teams can deliver business results faster, at higher quality, and with lower risk.

Most Popular Programming Stories

More for Developers

Latest Developer Headlines

RSS Feeds