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I am building a project in core java. BUt i'm stuck in making a radio button group ( for entering the gender (male/female). For that i need a radio group such that only one radio button is selected at one time; and take the input into the database accordingly. Please help.

mKorbel
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shubh
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    Show us what you tried. And read http://docs.oracle.com/javase/tutorial/uiswing/components/button.html#radiobutton – JB Nizet Jul 21 '13 at 09:42

3 Answers3

30

Kindly try using ButtonGroup component and add two JRadioButton components named male and female to the ButtonGroup object and then display it in a JFrame using setVisible(true); method.

The Below code should be useful :- 

import java.awt.BorderLayout;
import java.awt.FlowLayout;
import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JRadioButton;

public class Rb extends JFrame {
    Rb() {
        JRadioButton male = new JRadioButton("male");
        JRadioButton female = new JRadioButton("Female");
        ButtonGroup bG = new ButtonGroup();
        bG.add(male);
        bG.add(female);
        this.setSize(100, 200);
        this.setLayout(new FlowLayout());
        this.add(male);
        this.add(female);
        male.setSelected(true);
        this.setVisible(true);
    }

    public static void main(String args[]) {
        Rb j = new Rb();
    }
}
George Z.
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G.Srinivas Kishan
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6

Here's a radio button grouping:

JRadioButton button1 = ...;
button1.setSelected(true);
JRadioButton button2 = ...;
ButtonGroup group = new ButtonGroup();
group.add(button1);
group.add(button2);
tbodt
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  • I tried this thing. But its showing a NUllPOinterException while a run. – shubh Jul 21 '13 at 10:05
  • @user2079152 the exception stack trace tells you exactly where the exception happens. If you can't understand it, the post your code and the full stack trace of the exception, in your question. – JB Nizet Jul 21 '13 at 10:18
5
    JPanel radioButtonPanel = new JPanel();
    append = new JRadioButton("append");
    build = new JRadioButton("x.x.1");
    build.setSelected(true); //sets this button as selected on startup
    small = new JRadioButton("x.1.x");
    huge = new JRadioButton("1.x.x");

    // Create the button group to keep only one selected.
    ButtonGroup btnGroup = new ButtonGroup();
    btnGroup.add(append);
    btnGroup.add(build);
    btnGroup.add(small);
    btnGroup.add(huge);

Then you add your Buttons to your JPanel or something similar.

Adrian Jandl
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  • Do we need to create a JPanel or can we simply add JRadioButtons to the JFrame directly? – shubh Jul 21 '13 at 10:06
  • Both should be possible, but it's preferred to use: JFrame with 1 or more JPanels. Each JPanel has 1 or more other Components like RadioButtons, Buttons, TextFields etc. – Adrian Jandl Jul 21 '13 at 10:25