Java Resource Loading using URL class

Java Relative Path Resource Loading using URL class:

This code is continuation of this Java AWT Piano Button Click Sound.

Github Repo:

I have made a github repository for this project. Get it here,

https://github.com/quickgrid/SimpleAwtGUIProject

Until this point i used a string to identify location of my resources ( *.wav audio files ). Now i will use getClass().getResource(“resourceName.extension”) to load resources from my class path.  Here getResources() will return an URL type object so here i store it in URL url variable. Then i pass that variable to AudioSystem.getAudioInputStream(url).

Next Creating jar files ( artifacts ) of this application in Intellij idea IDE.

Only changes from last version is highlighted below. Note that import statements may have changed but i haven’t highlighted them.


 

Code:

import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.Clip;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.net.URL;

/**
 * Created by asif on 8/15/2015.
 */
public class SimpleAwtGui implements ActionListener {
    private static final int button_count = 10;

    // Declare a Frame type variable
    Frame frame;
    MenuBar menuBar;
    Menu fileMenu, optionsMenu, helpMenu;
    Panel panelUpperSection, panelLowerSection;
    Label labelButtonPressHeading, labelButtonPressed;

    // Create an array of Button type Objects
    Button[] button = new Button[button_count];

    public SimpleAwtGui() {
        // Create Frame Object and pass in the Frame Name / title
        frame = new Frame("AWT GUI EXAMPLE");

        // Create MenuBar Object
        menuBar = new MenuBar();

        createPanels();
        createLabels();
        createButtons();
        createMenu();
    }

    private void createMenu() {
        // Create Menu objects to add to the MenuBar
        fileMenu = new Menu("File");
        optionsMenu = new Menu("Options");
        helpMenu = new Menu("Help");
    }

    private void createPanels() {
        // Create a panel object for organizing content
        panelUpperSection = new Panel();
        panelLowerSection = new Panel();
    }

    private void createLabels() {
        // create Label
        labelButtonPressHeading = new Label();
        labelButtonPressed = new Label();
    }

    private void createButtons() {
        // Use for loop to instantiate every button object
        for (int i = 0; i < button_count; ++i) {
            button[i] = new Button("" + i);
            button[i].setActionCommand("" + i);

            // if i is odd then change the button color
            if (i % 2 == 1) {
                button[i].setBackground(Color.BLACK);
                button[i].setForeground(Color.WHITE);
            }
        }
    }


    // Not necessary but good practice all codes inside this can be written inside main
    public void showFrame() {
        // set the size of the window
        frame.setSize(400, 400);

        // set the layout for the window
        frame.setLayout(new GridLayout(2, 1));

        addPanels();

        addLabels();

        // Add all of the buttons to the layout
        for (int i = 0; i < button_count; ++i) {
            panelLowerSection.add(button[i]);
            button[i].addActionListener(this);
        }

        // handles various window events
        handleWindowEvents();

        // Add Menu to MenuBar
        addMenuBarMenus();

        // Add MenuItem to Menu
        addMenuItems();

        // Add MenuBar to the Frame
        frame.setMenuBar(menuBar);

        // set the frame visible otherwise nothing will be shown
        frame.setVisible(true);
    }

    private void addPanels() {
        // Add panel to the frame
        frame.add(panelUpperSection);
        frame.add(panelLowerSection);

        // Set Layout for the panels
        panelUpperSection.setLayout(new BorderLayout());
        panelLowerSection.setLayout(new GridLayout());

        // Add Label to Panel
        panelUpperSection.add(labelButtonPressHeading, BorderLayout.NORTH);
        panelUpperSection.add(labelButtonPressed, BorderLayout.CENTER);
    }

    private void addLabels() {
        labelButtonPressHeading.setBackground(Color.BLACK);
        labelButtonPressHeading.setText("Buttons clicked will be shown Below:");
        labelButtonPressHeading.setForeground(Color.WHITE);

        labelButtonPressed.setBackground(Color.DARK_GRAY);
        labelButtonPressed.setForeground(Color.WHITE);
    }

    private void handleWindowEvents() {
        // Register window listener event to the frame without implementing WindowListener
        frame.addWindowListener(
                new WindowAdapter() {
                    public void windowClosing(WindowEvent e) {
                        System.exit(0);
                    }
                }
        );
    }

    private void addMenuBarMenus() {
        // Add Menu to the MenuBar
        menuBar.add(fileMenu);
        menuBar.add(optionsMenu);
        menuBar.add(helpMenu);
    }

    private void addMenuItems() {
        // Add items to File Menu
        fileMenu.add(new MenuItem("New"));
        fileMenu.add(new MenuItem("Open"));
        fileMenu.add(new MenuItem("Exit"));

        // Add items to File Menu
        optionsMenu.add(new MenuItem("Options"));

        // Add items to File Menu
        helpMenu.add(new MenuItem("Help"));
        helpMenu.add(new MenuItem("About"));
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        int i = Integer.parseInt(e.getActionCommand());

        if (i % 2 == 1) {
            labelButtonPressed.setText("Odd buttons Pressed");
            URL url = getClass().getResource("a.wav");
            playSound(url);
        } else {
            labelButtonPressed.setText("Even buttons Pressed");
            URL url = getClass().getResource("b.wav");
            playSound(url);
        }
    }

    public void playSound(URL url) {
        try {
            AudioInputStream audioInputStream = AudioSystem.getAudioInputStream(url);
            Clip clip = AudioSystem.getClip();
            clip.stop();
            clip.open(audioInputStream);
            clip.start();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {

        // Create an instance of SimpleAwtGui
        SimpleAwtGui gapp = new SimpleAwtGui();

        // call the showFrame() function to display the window
        gapp.showFrame();


    }

}
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