Membuat Toolbar Kelas JToolBar Di Program Java

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// Nama file : DemoTollBar.java
// Mendemonstrasikan penggunaan tool bar.

// Mengimpor kelas
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.net.URL;

// Mendeklarasikan kelas
public class DemoToolBar extends JFrame {

   private JLabel label;
   private Font font;
   private JButton jbtNew, jbtLeft, jbtCenter, jbtRight;
   private URL urlNewText, urlLeft, urlCenter, urlRight;
   private ImageIcon iconNew, iconLeft, iconCenter, iconRight;

   public DemoToolBar() {
      font = new Font("Tahoma", Font.BOLD, 29);
      label = new JLabel("Belajar Java", SwingConstants.CENTER);
      label.setFont(font);
      label.setForeground(Color.RED);

      // Mengakses ikon
      Class metaObject = this.getClass();
      urlNewText = metaObject.getResource("image5/newtext.png");
      urlLeft = metaObject.getResource("image5/textalignleft.png");
      urlCenter = metaObject.getResource("image5/textaligncenter.png");
      urlRight = metaObject.getResource("image5/textalignright.png");

      iconNew = new ImageIcon(urlNewText);
      iconLeft = new ImageIcon(urlLeft);
      iconCenter = new ImageIcon(urlCenter);
      iconRight = new ImageIcon(urlRight);

      // Membuat obyek listener
      ButtonListener listener = new ButtonListener();

      // Membuat obyek button dan menambahkan pada tool bar
      jbtNew = new JButton("New Text", iconNew);
      jbtNew.addActionListener(listener);
      jbtLeft = new JButton("Left", iconLeft);
      jbtLeft.addActionListener(listener);
      jbtCenter = new JButton("Center", iconCenter);
      jbtCenter.addActionListener(listener);
      jbtRight = new JButton("Right", iconRight);
      jbtRight.addActionListener(listener);

      JToolBar toolbar = new JToolBar("Format Tool Bar");
      toolbar.setFloatable(true);
      toolbar.add(jbtNew);
      toolbar.addSeparator();
      toolbar.add(jbtLeft);
      toolbar.add(jbtCenter);
      toolbar.add(jbtRight);

      // Meletakkan toolbar dan label di frame
      getContentPane().add(toolbar, BorderLayout.PAGE_START);
      getContentPane().add(label, BorderLayout.CENTER);
   }

   // Inner class sebagai obyek pendengar
   class ButtonListener implements ActionListener {
      public void actionPerformed(ActionEvent ae) {

         if (ae.getSource() == jbtNew) {
            String newText = JOptionPane.showInputDialog(DemoToolBar.this,
                                "Enter a new text", "New Text",
                                JOptionPane.PLAIN_MESSAGE);
            label.setText((newText == null) ? label.getText() : newText);
         }

         else if (ae.getSource() == jbtLeft)
            label.setHorizontalAlignment(SwingConstants.LEFT);

         else if (ae.getSource() == jbtCenter)
            label.setHorizontalAlignment(SwingConstants.CENTER);

         else if (ae.getSource() == jbtRight)
            label.setHorizontalAlignment(SwingConstants.RIGHT);
      }
   }

   // Metoda main
   public static void main(String[] args) {
      DemoToolBar frame = new DemoToolBar();
      frame.setTitle("Kelas DemoToolBar");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.setSize(330, 150);
      frame.setVisible(true);
   }
}