/*
* @(#)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;
}
}
各种排序方法演示Java小程.rar （9个子文件） 
各种排序方法演示Java小程 
BidirBubbleSortAlgorithm.java 3KB SortItem.java 6KB InsertAlgorithm.java 736B ShellAlgorithm.java 1KB BubbleSortAlgorithm.java 2KB SortAlgorithm.java 3KB HeapAlgorithm.java 1KB QSortAlgorithm.java 4KB
www.pudn.com.txt 218B资源评论
