How to define JRadioButton label position?

By Wayan in Swing 0 Comment

In this code snippet you’ll see how to define JRadioButton label position. By default, the label will be displayed on the right side of the button. In the code below you will see some examples for placing the label on the left side, at the top and the bottom of the JRadioButton.

To define the label position we use the combination of the setHorizontalTextPosition() and setVerticalTextPosition() method and specified the position using one of the available constant in SwingConstants interface.

package org.kodejava.swing;

import javax.swing.*;

public class RadioButtonLabelPosition {
    public static void main(String[] args) {
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        JPanel panel = new JPanel();

        // Create JRadioButton with label on the right
        JRadioButton button1 = new JRadioButton("Button One");
        button1.setHorizontalTextPosition(SwingConstants.RIGHT);

        // Create JRadioButton with label on the left
        JRadioButton button2 = new JRadioButton("Button Two");
        button2.setHorizontalTextPosition(SwingConstants.LEFT);

        // Create JRadioButton with label at the bottom centered.
        JRadioButton button3 = new JRadioButton("Button Three");
        button3.setVerticalTextPosition(SwingConstants.BOTTOM);
        button3.setHorizontalTextPosition(SwingConstants.CENTER);

        // Create JRadioButton with label at the top centered.
        JRadioButton button4 = new JRadioButton("Button Four");
        button4.setVerticalTextPosition(SwingConstants.TOP);
        button4.setHorizontalTextPosition(SwingConstants.CENTER);

        panel.add(button1);
        panel.add(button2);
        panel.add(button3);
        panel.add(button4);

        frame.add(panel);
        frame.setSize(500, 300);
        frame.setVisible(true);
    }
}

Here is a screen capture result of the code snippet above:

JRadioButton Label Position

How do I create JRadioButton and define some action?

By Wayan in Swing 0 Comment

Below we create a JRadioButton and pass an action handle to the component so that we know when the component is clicked.

package org.kodejava.swing;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;

public class RadioButtonCreateAction extends JFrame {
    public RadioButtonCreateAction() {
        initializeUI();
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(
                () -> new RadioButtonCreateAction().setVisible(true));
    }

    private void initializeUI() {
        setSize(300, 300);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setLayout(new FlowLayout());

        Action action = new AbstractAction() {
            public void actionPerformed(ActionEvent e) {
                JRadioButton button = (JRadioButton) e.getSource();
                System.out.println("actionPerformed " + button.getText());
            }
        };

        // Create a radio button and pass an AbstractAction as its constructor.
        // The action will be call everytime the radio button is clicked or
        // pressed. But when it selected programmatically the action will not 
        // be called.
        JRadioButton button = new JRadioButton(action);
        button.setText("Click Me!");
        button.setSelected(true);

        getContentPane().add(button);
    }
}

How do I create a JRadioButton component?

By Wayan in Swing 0 Comment

This simple example shows you how to create a JRadioButton component. To create an instance of JRadioButton we can simply call its constructor and pass a string as the radio button text.

We can also call the constructor with a boolean value after the text to indicate whether the radio button is selected or not.

package org.kodejava.swing;

import javax.swing.*;
import java.awt.*;

public class RadioButtonCreate extends JFrame {
    public RadioButtonCreate() {
        initializeUI();
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(
                () -> new RadioButtonCreate().setVisible(true));
    }

    private void initializeUI() {
        setSize(500, 500);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setLayout(new GridLayout(1, 2));

        JPanel leftPanel = new JPanel();
        JLabel label = new JLabel("Employees: ");
        leftPanel.add(label);

        JPanel rightPanel = new JPanel(new GridLayout(4, 1));

        // Create a JRadioButton by calling the JRadioButton constructors and
        // passing a string for radio button text. We can also pass a boolean
        // value to select or unselect the radio button.
        JRadioButton radio1 = new JRadioButton("1 - 10");
        JRadioButton radio2 = new JRadioButton("11 - 50", true);
        JRadioButton radio3 = new JRadioButton("51 - 100");
        JRadioButton radio4 = new JRadioButton("101 - 1000", false);

        rightPanel.add(radio1);
        rightPanel.add(radio2);
        rightPanel.add(radio3);
        rightPanel.add(radio4);

        getContentPane().add(leftPanel);
        getContentPane().add(rightPanel);

        pack();
    }
}