Java tutorial
/* From http://java.sun.com/docs/books/tutorial/index.html */ /* * Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * -Redistribution of source code must retain the above copyright notice, this * list of conditions and the following disclaimer. * * -Redistribution in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * * Neither the name of Sun Microsystems, Inc. or the names of contributors may * be used to endorse or promote products derived from this software without * specific prior written permission. * * This software is provided "AS IS," without a warranty of any kind. ALL * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING * ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE * OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN") * AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE * AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, * INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY * OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. * * You acknowledge that this software is not designed, licensed or intended * for use in the design, construction, operation or maintenance of any * nuclear facility. */ /* <html> <body> <applet code=SoundExample.class width=450 height=50> </applet> </body> </html> */ /* * 1.1 version. */ import java.applet.Applet; import java.applet.AudioClip; import java.awt.Button; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.net.URL; public class SoundExample extends Applet implements ActionListener { SoundList soundList; String onceFile = "bark.au"; String loopFile = "train.au"; AudioClip onceClip; AudioClip loopClip; Button playOnce; Button startLoop; Button stopLoop; Button reload; boolean looping = false; public void init() { playOnce = new Button("Bark!"); playOnce.addActionListener(this); add(playOnce); startLoop = new Button("Start sound loop"); stopLoop = new Button("Stop sound loop"); stopLoop.setEnabled(false); startLoop.addActionListener(this); add(startLoop); stopLoop.addActionListener(this); add(stopLoop); reload = new Button("Reload sounds"); reload.addActionListener(this); add(reload); startLoadingSounds(); } void startLoadingSounds() { //Start asynchronous sound loading. soundList = new SoundList(this, getCodeBase()); soundList.startLoading(loopFile); soundList.startLoading(onceFile); } public void stop() { onceClip.stop(); //Cut short the one-time sound. if (looping) { loopClip.stop(); //Stop the sound loop. } } public void start() { if (looping) { loopClip.loop(); //Restart the sound loop. } } public void actionPerformed(ActionEvent event) { //PLAY BUTTON Object source = event.getSource(); if (source == playOnce) { if (onceClip == null) { //Try to get the AudioClip. onceClip = soundList.getClip(onceFile); } if (onceClip != null) { //If the sound is loaded: onceClip.play(); //Play it once. showStatus("Playing sound " + onceFile + "."); } else { showStatus("Sound " + onceFile + " not loaded yet."); } return; } //START LOOP BUTTON if (source == startLoop) { if (loopClip == null) { //Try to get the AudioClip. loopClip = soundList.getClip(loopFile); } if (loopClip != null) { //If the sound is loaded: looping = true; loopClip.loop(); //Start the sound loop. stopLoop.setEnabled(true); //Enable stop button. startLoop.setEnabled(false); //Disable start button. showStatus("Playing sound " + loopFile + " continuously."); } else { showStatus("Sound " + loopFile + " not loaded yet."); } return; } //STOP LOOP BUTTON if (source == stopLoop) { if (looping) { looping = false; loopClip.stop(); //Stop the sound loop. startLoop.setEnabled(true); //Enable start button. stopLoop.setEnabled(false); //Disable stop button. } showStatus("Stopped playing sound " + loopFile + "."); return; } //RELOAD BUTTON if (source == reload) { if (looping) { //Stop the sound loop. looping = false; loopClip.stop(); startLoop.setEnabled(true); //Enable start button. stopLoop.setEnabled(false); //Disable stop button. } loopClip = null; //Reset AudioClip to null. onceClip = null; //Reset AudioClip to null. startLoadingSounds(); showStatus("Reloading all sounds."); return; } } } /* * Code is the same in both 1.0 and 1.1. */ //Loads and holds a bunch of audio files whose locations are specified //relative to a fixed base URL. class SoundList extends java.util.Hashtable { Applet applet; URL baseURL; public SoundList(Applet applet, URL baseURL) { super(5); //Initialize Hashtable with capacity of 5 entries. this.applet = applet; this.baseURL = baseURL; } public void startLoading(String relativeURL) { new SoundLoader(applet, this, baseURL, relativeURL); } public AudioClip getClip(String relativeURL) { return (AudioClip) get(relativeURL); } public void putClip(AudioClip clip, String relativeURL) { put(relativeURL, clip); } } /* * Code is the same in both 1.0 and 1.1. */ class SoundLoader extends Thread { Applet applet; SoundList soundList; URL baseURL; String relativeURL; public SoundLoader(Applet applet, SoundList soundList, URL baseURL, String relativeURL) { this.applet = applet; this.soundList = soundList; this.baseURL = baseURL; this.relativeURL = relativeURL; setPriority(MIN_PRIORITY); start(); } public void run() { AudioClip audioClip = applet.getAudioClip(baseURL, relativeURL); //AudioClips load too fast for me! //Simulate slow loading by adding a delay of up to 10 seconds. try { sleep((int) (Math.random() * 10000)); } catch (InterruptedException e) { } soundList.putClip(audioClip, relativeURL); } }