I want to have several EventHandler in just one class, but I don\'t know how to

Question

I want to have several EventHandler in just one class, but I don't know how to works, I have the code as the following, please check them out. I want to when I click exit on the JMenuItem, the jfram should exit, when I click Mandelbrot Set on the JMenuItem, it should output Mandelbrot Set text message in the console.

package code;

import javax.swing.JFrame;

import javax.swing.JMenu;

import javax.swing.JMenuBar;

import javax.swing.JMenuItem;

//import edu.buffalo.fractal.FractalPanel;

public class UI implements Runnable {

//   private FractalPanel panel;

   private JMenuBar menu = new JMenuBar();

   JMenuItem quit = new JMenuItem("exit");

   JMenuItem items = new JMenuItem("Mandelbrot Set");

   public void run() {

       JFrame jframe = new JFrame("fractal");

   //   panel = new FractalPanel();

       jframe.setVisible(true);

       jframe.setSize(500, 500);

       jframe.setResizable(true);

   //   jframe.add(panel);

       jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

       /************************************************************************************************/

       // Below codes are for the menu bar

       jframe.setJMenuBar(menu);

       // imported the Menu into the JFrame

       JMenu file = new JMenu("File");

       // File on the menu

       menu.add(file);

       //quit.addActionListener(new EventHandler());

       // Stored quit into the file JMenu

       file.add(quit);

       JMenu fractal = new JMenu("Fractal");

       // Fractal on the menu

       menu.add(fractal);

       //items.addActionListener(new EventHandler1());

       JMenuItem items1 = new JMenuItem("Julia Set");

       JMenuItem items2 = new JMenuItem("Burning Ship Set");

       JMenuItem items3 = new JMenuItem("Multibrot Set");

       // Stored Items for each fractal into the file JMenu

       fractal.add(items);

       fractal.add(items1);

       fractal.add(items2);

       fractal.add(items3);

       JMenu color = new JMenu("Color");

       // Color on the menu

       menu.add(color);

       JMenuItem colors = new JMenuItem("Blue");

       JMenuItem colors1 = new JMenuItem("Yellow");

       JMenuItem colors2 = new JMenuItem("Green");

       JMenuItem colors3 = new JMenuItem("Black");

       // Stored Items for each of your color schemes into the file JMenu

       color.add(colors);

       color.add(colors1);

       color.add(colors2);

       color.add(colors3);

       jframe.pack();

       /************************************************************************************************/

   }

}

package code;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

public class EventHandler implements ActionListener {

   @Override

   public void actionPerformed(ActionEvent e) {

       Object quit = new UI().quit;

       Object item = new UI().items;

       Object src = e.getSource();

       if ((src == quit)) {

           System.exit(0); // exit the program

       } else if (src == item) {

           System.out.println("Mandelbrot Set"); // output Mandelbrot Set

       }

}

}

Explanation / Answer

import java.awt.Color;

public class Mandelbrot {

    // return number of iterations to check if c = a + ib is in Mandelbrot set

    public static int mand(Complex z0, int max) {

        Complex z = z0;

        for (int t = 0; t < max; t++) {

            if (z.abs() > 2.0) return t;

            z = z.times(z).plus(z0);

        }

        return max;

    }

    public static void main(String[] args) {

        double xc   = Double.parseDouble(args[0]);

        double yc   = Double.parseDouble(args[1]);

        double size = Double.parseDouble(args[2]);

        int n   = 512;   // create n-by-n image

        int max = 255;   // maximum number of iterations

        Picture picture = new Picture(n, n);

        for (int i = 0; i < n; i++) {

            for (int j = 0; j < n; j++) {

                double x0 = xc - size/2 + size*i/n;

                double y0 = yc - size/2 + size*j/n;

                Complex z0 = new Complex(x0, y0);

                int gray = max - mand(z0, max);

                Color color = new Color(gray, gray, gray);

                picture.set(i, n-1-j, color);

            }

        }

        picture.show();

    }

}

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