How do I add a title to a border?

By I Wayan Saryada in Swing 0 Comment

This example shows you how to create a border that have a title in it. There is a special border class the TitledBorder that does this. We can define the justification of the title, left, centered or right justify. To do this we call the setTitleJustification() method. We can also set other attributes such as font or the title position.

package org.kodejava.swing;

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

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

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

    private void initializeUI() {
        setSize(500, 500);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setLayout(new FlowLayout(FlowLayout.LEFT));

        TitledBorder border = new TitledBorder(" Form Data ");
        border.setTitleJustification(TitledBorder.LEFT);
        border.setTitlePosition(TitledBorder.TOP);

        JPanel panel = new JPanel();
        panel.setBorder(border);
        panel.setLayout(new GridLayout(1, 2));

        JLabel usernameLabel = new JLabel("Username: ");
        JTextField usernameField = new JTextField();
        panel.add(usernameLabel);
        panel.add(usernameField);

        setContentPane(panel);
    }
}

How do I create Border for swing component?

By I Wayan Saryada in Swing 0 Comment

This example shows how we can create border for swing components. In the example below we set border of a JPanel component. Some border implementation that we use below including LineBorder, BevelBorder, EtchedBorder and MatteBorder.

package org.kodejava.swing;

import javax.swing.*;
import javax.swing.border.LineBorder;
import javax.swing.border.BevelBorder;
import javax.swing.border.EtchedBorder;
import javax.swing.border.MatteBorder;
import java.awt.*;

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

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

    private void initializeUI() {
        setSize(400, 400);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setLayout(new BorderLayout(15, 15));

        JPanel top = new JPanel();
        top.setBorder(new LineBorder(Color.RED, 1, true));

        JPanel bottom = new JPanel();
        bottom.setBorder(new BevelBorder(BevelBorder.LOWERED));

        JPanel left = new JPanel();
        left.setBorder(new EtchedBorder(EtchedBorder.RAISED));

        JPanel right = new JPanel();
        right.setBorder(new MatteBorder(5, 5, 5, 5, Color.BLUE));

        JPanel center = new JPanel();
        center.setBorder(new BevelBorder(BevelBorder.RAISED));

        getContentPane().add(top, BorderLayout.NORTH);
        getContentPane().add(bottom, BorderLayout.SOUTH);
        getContentPane().add(left, BorderLayout.WEST);
        getContentPane().add(right, BorderLayout.EAST);
        getContentPane().add(center, BorderLayout.CENTER);
    }
}

How do I create a ButtonGroup for radio buttons?

By I Wayan Saryada in Swing 0 Comment

This example shows you how to create a ButtonGroup for grouping our radio buttons components into a single group. In this example you can also see that we add an action listener to the radio buttons.

package org.kodejava.swing;

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

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

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

    private void initializeUI() {
        setSize(500, 500);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setLayout(new FlowLayout(FlowLayout.LEFT));

        // Creating an action listener for our radio button.
        ActionListener action = e -> {
            JRadioButton button = (JRadioButton) e.getSource();
            System.out.println("You select button: " + button.getText());
        };

        // Creates four radio buttons and set the action listener.
        JRadioButton button1 = new JRadioButton("One");
        button1.addActionListener(action);
        JRadioButton button2 = new JRadioButton("Two");
        button2.addActionListener(action);
        JRadioButton button3 = new JRadioButton("Three");
        button3.addActionListener(action);
        JRadioButton button4 = new JRadioButton("Four");
        button4.addActionListener(action);

        // Create a ButtonGroup to group our radio buttons into one group. This
        // will make sure that only one item or one radio is selected on the
        // group.
        ButtonGroup group = new ButtonGroup();
        group.add(button1);
        group.add(button2);
        group.add(button3);
        group.add(button4);

        getContentPane().add(button1);
        getContentPane().add(button2);
        getContentPane().add(button3);
        getContentPane().add(button4);
    }
}

How do I create JRadioButton and define some action?

By I Wayan Saryada 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 I Wayan Saryada 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();
    }
}