How could i add actions to this program....

Question

i am trying to add action events so that the menuItems will do something when selected (with if else statements) such as changing the background color or font text
yes, i am very new to java
thanks for any help
here is what i'm working with
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class ThemeChanger extends JFrame
JTextArea output;
JScrollPane scrollPane;
public ThemeChanger()
JMenuBar menuBar;
JMenu menu;
JMenuItem blue;
JMenuItem red;
JMenuItem green;
addWindowListener(new WindowAdapter()
public void windowClosing(WindowEvent e)
System.exit(0);
// Add components to window
Container contentPane = getContentPane();
output = new JTextArea(5, 20);
output.setEditable(false);
scrollPane = new JScrollPane(output);
contentPane.add(scrollPane, BorderLayout.CENTER);
//Create the menu bar.
menuBar = new JMenuBar();
setJMenuBar(menuBar);
//Build the first menu.
menu = new JMenu("Themes");
menuBar.add(menu);
//a group of JMenuItems
blue = new JMenuItem("Blue");
menu.add(blue);
red = new JMenuItem("Red");
menu.add(red);
green = new JMenuItem("Green");
menu.add(green);
public static void main(String args[])
ThemeChanger window = new ThemeChanger();
window.setTitle("Theme Changer");
window.setSize(300, 300);
window.setVisible(true);

Answer 1

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class ThemeChanger extends JFrame implements ActionListener{
   JMenuItem blue;
   JMenuItem red;
   JMenuItem green;
   JMenuItem coorier = new JMenuItem("Courier");
   JMenuItem times = new JMenuItem("Times new Roman");
   JMenuItem tahomah = new JMenuItem("Tahoma");;
   JMenuItem comics = new JMenuItem("Verdana");;  
   JMenu mFont;
   JTextArea output;
   JComboBox fontSizes;
   boolean newFont;
   String fontChanged = "Arial";
   int mySize = 12;
   Font startFont = new Font(fontChanged, Font.PLAIN,mySize);
  public ThemeChanger(){
     JMenu menu;
     Container contentPane = getContentPane();
     output = new JTextArea(4, 12);
     output.setFont(startFont);
     JScrollPane scrollPane = new JScrollPane(output);
     contentPane.add(scrollPane, BorderLayout.CENTER);
     JMenuBar menuBar = new JMenuBar();
     setJMenuBar(menuBar);
     menu = new JMenu("Colour");
     menuBar.add(menu);
     blue = new JMenuItem("Blue");
     blue.addActionListener(this);
     menu.add(blue);
     red = new JMenuItem("Red");
     menu.add(red);
     red.addActionListener(this);
     green = new JMenuItem("Green");
     green.addActionListener(this);
     menu.add(green);
     mFont= new JMenu("Font");
      mFont.add(coorier);
      coorier.addActionListener(this);
      mFont.add(times);
      times.addActionListener(this);
      mFont.add(tahomah);
      tahomah.addActionListener(this);
      mFont.add(comics);
      comics.addActionListener(this);
      menuBar.add(mFont);
      mFont.addActionListener(this);
     fontSizes = new JComboBox();
      fontSizes.addItem("Size");
      fontSizes.addItem("8");
      fontSizes.addItem("10");
      fontSizes.addItem("11");
      fontSizes.addItem("12"); 
      fontSizes.addItem("14");
      fontSizes.addItem("18");
      fontSizes.addItem("22");
      fontSizes.addItem("28");
      fontSizes.addItem("36");
      fontSizes.addItem("48");
      fontSizes.addItem("72");
        fontSizes.setMaximumRowCount(5);
      fontSizes.setBackground(Color.white);
      fontSizes.addActionListener(this);
     menuBar.add(fontSizes);
  public void actionPerformed(ActionEvent e){
    if(e.getSource()==blue)  output.setForeground(Color.blue);
    if(e.getSource()==red)   output.setForeground(Color.red);
    if(e.getSource()==green) output.setForeground(Color.green);
    if(e.getSource()==fontSizes) {
       mySize = Integer.parseInt((String)fontSizes.getSelectedItem());
       output.setFont(new Font(fontChanged, Font.PLAIN,mySize));
    if(((e.getSource()==coorier))||((e.getSource()==times)||(e.getSource()==tahomah))||((e.getSource()==comics))) {
       fontChanged = e.getActionCommand();
       output.setFont(new Font(fontChanged, Font.PLAIN,mySize));
  public static void main(String args[]) {
     ThemeChanger window = new ThemeChanger();
     window.setTitle("Theme Changer");
     window.setSize(300, 300);
     window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     window.setVisible(true);
}