How do I create a simple JTabbedPane?

By Wayan in Swing 0 Comment

In this example you will learn how to use JTabbedPane to arrange some components in tabbed view. The JTabbedPane component of the Swing API allows some components such as panels to share the same view. By selecting the corresponding tab, the panel will be displayed on the user’s screen. To add tabs to the JTabbedPane class you can use the addTab() method.

To the addTab() method accept two arguments, the title of the tab and the component you wish to display as the content of the tab. In the code snippet below we will use a simple panel as the content of the tab. You can also define an image icon for the tab which makes the program looks better. You can read it in this example:

Now, let’s create a simple example of JTabbedPane which has three tabs and the corresponding content, they are the Dashboard, Transaction and Account tabs. Below is an image that show how the screen will look.

Simple JTabbedPane Demo

package org.kodejava.swing;

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

public class SimpleTabbedPane extends JPanel {
    public SimpleTabbedPane() {
        initializeUI();
    }

    public static void showFrame() {
        JPanel panel = new SimpleTabbedPane();
        panel.setOpaque(true);

        JFrame frame = new JFrame("Simple Tabbed Pane Demo");
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        frame.setContentPane(panel);
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(SimpleTabbedPane::showFrame);
    }

    private void initializeUI() {
        JTabbedPane tabbedPane = new JTabbedPane();

        JPanel dashboardPanel = new JPanel();
        dashboardPanel.add(new JLabel("Dashboard"));

        // Add Dashboard Tab
        tabbedPane.addTab("Dashboard", dashboardPanel);

        JPanel transactionPanel = new JPanel();
        transactionPanel.add(new JLabel("Transaction"));

        // Add Transactions Tab
        tabbedPane.addTab("Transaction", transactionPanel);

        JPanel accountPanel = new JPanel();
        accountPanel.add(new JLabel("Account"));

        // Add Account Tab
        tabbedPane.addTab("Account", accountPanel);

        this.setLayout(new BorderLayout());
        this.setPreferredSize(new Dimension(500, 200));
        this.add(tabbedPane, BorderLayout.CENTER);
    }
}

How do I reverse JSlider’s value-range?

By Wayan in Swing 0 Comment

On a normal JSlider the value range displayed left-to-right on a horizontal JSlider and bottom-to-top on vertical JSlider. To reverse the slider values from their normal order you can use the setInverted() method of the JSlider instance. Passing a true boolean value into this method call reverse the values order.

package org.kodejava.swing;

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

public class JSliderInvertedDemo extends JPanel {
    public JSliderInvertedDemo() {
        initializeUI();
    }

    public static void showFrame() {
        JPanel panel = new JSliderInvertedDemo();

        JFrame frame = new JFrame("Inverted JSlider");
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        frame.setContentPane(panel);
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(JSliderInvertedDemo::showFrame);
    }

    private void initializeUI() {
        setLayout(new BorderLayout());
        setPreferredSize(new Dimension(500, 200));

        JSlider slider = new JSlider(JSlider.HORIZONTAL, 0, 20, 10);
        slider.setMinorTickSpacing(1);
        slider.setMajorTickSpacing(5);
        slider.setPaintLabels(true);
        slider.setPaintTicks(true);

        // Reverse the value-range of a JSlider. On a normal
        // horizontal JSlider the maximum value is on the right
        // side. Specifying inverted to true makes the maximum
        // value placed on the left side.
        slider.setInverted(true);

        add(slider, BorderLayout.CENTER);
    }
}

The result of the code snippet above is:

Inverted JSlider Demo

How do I create a JSlider with custom labels?

By Wayan in Swing 0 Comment

The JSlider‘s setLabelTable() method allows you to define a custom labels for the JSlider. The label table is a Hashtable that contains an Integer number as the keys and a JLabel component as their values. The integer keys correspond to the JSlider tick where the labels will be customized.

package org.kodejava.swing;

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

public class JSliderCustomLabel extends JPanel {
    public JSliderCustomLabel() {
        initializeUI();
    }

    public static void showFrame() {
        JPanel panel = new JSliderCustomLabel();

        JFrame frame = new JFrame("JSlider Custom Label");
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        frame.setContentPane(panel);
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(JSliderCustomLabel::showFrame);
    }

    private void initializeUI() {
        setLayout(new BorderLayout());
        setPreferredSize(new Dimension(500, 200));

        JSlider slider = new JSlider(JSlider.VERTICAL, 0, 40, 0);
        slider.setMinorTickSpacing(1);
        slider.setMajorTickSpacing(5);
        slider.setPaintTicks(true);

        Hashtable<Integer, JLabel> labels = new Hashtable<>();
        labels.put(0, new JLabel("Freezing"));
        labels.put(15, new JLabel("Cold"));
        labels.put(25, new JLabel("Warm"));
        labels.put(35, new JLabel("Hot"));
        slider.setLabelTable(labels);

        slider.setPaintLabels(true);

        add(slider, BorderLayout.CENTER);
    }
}

The screen capture of the example above is:

JSlider with Custom Labels Demo

How do I create a JSlider that snap to the closest tick mark?

By Wayan in Swing 0 Comment

The JSlider‘s setSnapToTicks() method call is used to move JSlider‘s knob to the nearest tick mark from where you positioned the knob. The default value of this property is false. To make it snap to the closest tick set this property to true.

package org.kodejava.swing;

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

public class SnapToTickJSlider extends JPanel {
    public SnapToTickJSlider() {
        initializeUI();
    }

    public static void showFrame() {
        JPanel panel = new SnapToTickJSlider();

        JFrame frame = new JFrame("JSlider - Snap to Tick");
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        frame.setContentPane(panel);
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(SnapToTickJSlider::showFrame);
    }

    private void initializeUI() {
        setLayout(new BorderLayout());
        setPreferredSize(new Dimension(500, 200));

        JSlider slider = new JSlider(JSlider.HORIZONTAL, 0, 30, 0);
        slider.setMinorTickSpacing(5);
        slider.setMajorTickSpacing(10);
        slider.setPaintLabels(true);
        slider.setPaintTicks(true);

        // Snaps to the closest tick mark next to where the user
        // positioned the knob.
        slider.setSnapToTicks(true);

        add(slider, BorderLayout.CENTER);
    }
}

The screen capture of the result of the code snippet above is:

JSlider Snap to Ticks Demo

How do I create a vertical JSlider?

By Wayan in Swing 0 Comment

To create a vertical JSlider set the orientation on the JSlider‘s constructor to JSlider.VERTICAL. If you do not pass JSlider.VERTICAL as a constructor parameter use the setOrientation() method instead.

package org.kodejava.swing;

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

public class JSliderVertical extends JPanel {
    public JSliderVertical() {
        initializeUI();
    }

    public static void showFrame() {
        JPanel panel = new JSliderVertical();
        panel.setOpaque(true);

        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        frame.setTitle("Vertical JSlider");
        frame.setContentPane(panel);
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(JSliderVertical::showFrame);
    }

    private void initializeUI() {
        setLayout(new BorderLayout());
        setPreferredSize(new Dimension(500, 200));

        // Creates a vertical JSlider that accept value in the
        // range between 0 and 20. The initial value is set to 4.
        JSlider slider = new JSlider(JSlider.VERTICAL, 0, 20, 4);
        slider.setPaintTicks(true);
        slider.setPaintLabels(true);
        slider.setMinorTickSpacing(1);
        slider.setMajorTickSpacing(4);

        add(slider, BorderLayout.CENTER);
    }
}

The screen capture of the code snippet above.

Vertical JSlider Demo