import javax.swing.*;
import javax.swing.event.*;

import java.awt.*;
import java.awt.event.*;


public class SwingComponents extends JFrame {


  private String[] listItems = { "... featuring", "multiple", "rows in a", "list." };

  public SwingComponents() {

    super("Swing Components found also as AWT components");

    setSize(500, 400);

    Container content = getContentPane();
    content.setLayout(new BorderLayout());


    JPanel panel = new JPanel();

      GridBagLayout gbl = new GridBagLayout();
      panel.setLayout(gbl);
      GridBagConstraints gbc = new GridBagConstraints();

      gbc.anchor = GridBagConstraints.NORTHWEST;
      gbc.insets = new Insets(2, 3, 2, 3);


      gbc.gridy = 0;

      JLabel label1 = new JLabel("JLabel: ");

        gbc.gridx = 0;
        gbl.setConstraints(label1, gbc);
        panel.add(label1);

    // Swing Component: JLabel, 1 line
      JLabel label = new JLabel("A simple label");

        gbc.gridx = 1;
        gbl.setConstraints(label, gbc);
        panel.add(label);


      gbc.gridy = 1;

      JLabel label2 = new JLabel("JButton: ");

        gbc.gridx = 0;
        gbl.setConstraints(label2, gbc);
        panel.add(label2);

    // Swing Component: JButton, 1 line
      JButton button = new JButton("A simple push-button");

        gbc.gridx = 1;
        gbl.setConstraints(button, gbc);
        panel.add(button);


      gbc.gridy = 2;

      JLabel label4 = new JLabel("JCheckBox: ");

        gbc.gridx = 0;
        gbl.setConstraints(label4, gbc);
        panel.add(label4);

    // Swing Component: JCheckbox, 1 line
      JCheckBox checkbox = new JCheckBox("A simple checkbox");

        gbc.gridx = 1;
        gbl.setConstraints(checkbox, gbc);
        panel.add(checkbox);


      gbc.gridy = 3;

      JLabel label5 = new JLabel("JComboBox: ");

        gbc.gridx = 0;
        gbl.setConstraints(label5, gbc);
        panel.add(label5);

    // Swing Component: JComboBox, 5 lines
      JComboBox combo = new JComboBox();
      combo.addItem("... featuring");
      combo.addItem("multiple");
      combo.addItem("lines in");
      combo.addItem("a drop down.");

        gbc.gridx = 1;
        gbl.setConstraints(combo, gbc);
        panel.add(combo);


      gbc.gridy = 4;

      JLabel label6 = new JLabel("JList: ");

        gbc.gridx = 0;
        gbl.setConstraints(label6, gbc);
        panel.add(label6);

    // Swing Component: JList, 2 lines
      JList list = new JList(listItems);
      list.setVisibleRowCount(3);

        gbc.gridx = 1;
        gbl.setConstraints(list, gbc);
        panel.add(list);


      gbc.gridy = 7;

      JLabel label7 = new JLabel("JTextField: ");

        gbc.gridx = 0;
        gbl.setConstraints(label7, gbc);
        panel.add(label7);

    // Swing Component: TextField, 1 line
      JTextField textfield = new JTextField("A simple text field");

        gbc.gridx = 1;
        gbl.setConstraints(textfield, gbc);
        panel.add(textfield);


      gbc.gridy = 8;

      JLabel label8 = new JLabel("JTextArea: ");

        gbc.gridx = 0;
        gbl.setConstraints(label8, gbc);
        panel.add(label8);

    // Swing Component: TextArea, 1 line
      JTextArea textarea = new JTextArea("A simple\ntext area", 4, 30);

        gbc.gridx = 1;
        gbl.setConstraints(textarea, gbc);
        panel.add(textarea);


      gbc.gridy = 12;

      JLabel label9 = new JLabel("JScrollBar: ");

        gbc.gridx = 0;
        gbl.setConstraints(label9, gbc);
        panel.add(label9);

    // Swing Component: Scrollbar, 1 line
      JScrollBar scrollbar = new JScrollBar(JScrollBar.HORIZONTAL, 0, 60, 0, 300);

        gbc.gridx = 1;
        gbl.setConstraints(scrollbar, gbc);
        panel.add(scrollbar);

    content.add(panel, BorderLayout.CENTER);


    WindowListener wndCloser = new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        System.exit(0);
      }
    };
    addWindowListener(wndCloser);
    setVisible(true);
  }


  public static void main(String[] args) {

    SwingComponents swingComponents = new SwingComponents();
  }
}