各种排序方法演示Java小程.rar_javascript

/* * @(#)SortItem.java 1.17f 95/04/10 James Gosling 1.18 96/4/24 Jim Hagen : use setBackground * * Copyright (c) 1994-1996 Sun Microsystems, Inc. All Rights Reserved. * * Permission to use, copy, modify, and distribute this software * and its documentation for NON-COMMERCIAL or COMMERCIAL purposes and * without fee is hereby granted. * Please refer to the file http://java.sun.com/copy_trademarks.html * for further important copyright and trademark information and to * http://java.sun.com/licensing.html for further important licensing * information for the Java (tm) Technology. * * SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF * THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED * TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A * PARTICULAR PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. * * THIS SOFTWARE IS NOT DESIGNED OR INTENDED FOR USE OR RESALE AS ON-LINE * CONTROL EQUIPMENT IN HAZARDOUS ENVIRONMENTS REQUIRING FAIL-SAFE * PERFORMANCE, SUCH AS IN THE OPERATION OF NUCLEAR FACILITIES, AIRCRAFT * NAVIGATION OR COMMUNICATION SYSTEMS, AIR TRAFFIC CONTROL, DIRECT LIFE * SUPPORT MACHINES, OR WEAPONS SYSTEMS, IN WHICH THE FAILURE OF THE * SOFTWARE COULD LEAD DIRECTLY TO DEATH, PERSONAL INJURY, OR SEVERE * PHYSICAL OR ENVIRONMENTAL DAMAGE ("HIGH RISK ACTIVITIES"). SUN * SPECIFICALLY DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR * HIGH RISK ACTIVITIES. */ import java.awt.*; import java.io.InputStream; import java.util.Hashtable; import java.net.*; /** * A simple applet class to demonstrate a sort algorithm. * You can specify a sorting algorithm using the "alg" * attribute. When you click on the applet, a thread is * forked which animates the sorting algorithm. * * You can also specify the length of the pause with the * "pause" attribute. Default is 200. * * @author James Gosling * @version 1.17f, 10 Apr 1995 * @modified Lars M. Garshol - 20.04.97 - Added pause parameter */ public class SortItem extends java.applet.Applet implements Runnable { /** * The thread that is sorting (or null). */ private Thread kicker; /** * The array that is being sorted. */ int arr[]; /** * The high water mark. */ int h1 = -1; /** * The low water mark. */ int h2 = -1; /** * The name of the algorithm. */ String algName; /** * The sorting algorithm (or null). */ SortAlgorithm algorithm; /** * The length of the pause. */ int pauselength; /** * Fill the array with random numbers from 0..n-1. */ void scramble() { int a[] = new int[size().height / 2]; double f = size().width / (double) a.length; for (int i = a.length; --i >= 0;) { a[i] = (int)(i * f); } for (int i = a.length; --i >= 0;) { int j = (int)(i * Math.random()); int t = a[i]; a[i] = a[j]; a[j] = t; } arr = a; } /** * Pause a while. * @see SortAlgorithm */ void pause() { pause(-1, -1); } /** * Pause a while, and draw the high water mark. * @see SortAlgorithm */ void pause(int H1) { pause(H1, -1); } /** * Pause a while, and draw the low&high water marks. * @see SortAlgorithm */ void pause(int H1, int H2) { h1 = H1; h2 = H2; if (kicker != null) { repaint(); } try {Thread.sleep(pauselength);} catch (InterruptedException e){} } /** * Initialize the applet. */ public void init() { String at = getParameter("alg"); if (at == null) { at = "BubbleSort"; } algName = at + "Algorithm"; scramble(); at = getParameter("pause"); if (at == null) { at = "200"; } pauselength=Integer.parseInt(at); resize(100, 100); } /** * Paint the array of numbers as a list * of horizontal lines of varying lenghts. */ public void paint(Graphics g) { int a[] = arr; int y = size().height - 1; // Erase old lines g.setColor(getBackground()); for (int i = a.length; --i >= 0; y -= 2) { g.drawLine(arr[i], y, size().width, y); } // Draw new lines g.setColor(Color.black); y = size().height - 1; for (int i = a.length; --i >= 0; y -= 2) { g.drawLine(0, y, arr[i], y); } if (h1 >= 0) { g.setColor(Color.red); y = h1 * 2 + 1; g.drawLine(0, y, size().width, y); } if (h2 >= 0) { g.setColor(Color.blue); y = h2 * 2 + 1; g.drawLine(0, y, size().width, y); } } /** * Update without erasing the background. */ public void update(Graphics g) { paint(g); } /** * Run the sorting algorithm. This method is * called by class Thread once the sorting algorithm * is started. * @see java.lang.Thread#run * @see SortItem#mouseUp */ public void run() { try { if (algorithm == null) { algorithm = (SortAlgorithm)Class.forName(algName).newInstance(); algorithm.setParent(this); } algorithm.init(); algorithm.sort(arr); } catch(Exception e) { } } /** * Stop the applet. Kill any sorting algorithm that * is still sorting. */ public synchronized void stop() { if (kicker != null) { try { kicker.stop(); } catch (IllegalThreadStateException e) { // ignore this exception } kicker = null; } if (algorithm != null){ try { algorithm.stop(); } catch (IllegalThreadStateException e) { // ignore this exception } } } /** * For a Thread to actually do the sorting. This routine makes * sure we do not simultaneously start several sorts if the user * repeatedly clicks on the sort item. It needs to be * synchronoized with the stop() method because they both * manipulate the common kicker variable. */ private synchronized void startSort() { if (kicker == null || !kicker.isAlive()) { scramble(); repaint(); kicker = new Thread(this); kicker.start(); } } /** * The user clicked in the applet. Start the clock! */ public boolean mouseUp(java.awt.Event evt, int x, int y) { startSort(); return true; } }