/usr/share/doc/openjdk-11-jre-headless/demo/applets/SortDemo/SortItem.java is in openjdk-11-demo 10.0.1+10-3ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 | /*
* Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions 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 Oracle nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* This source code is provided to illustrate the usage of a given feature
* or technique and has been deliberately simplified. Additional steps
* required for a production-quality application, such as security checks,
* input validation and proper error handling, might not be present in
* this sample code.
*/
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
/**
* 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.
*
* @author James Gosling
*/
@SuppressWarnings("serial")
public class SortItem extends java.applet.Applet implements Runnable,
MouseListener {
/**
* 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;
Dimension initialSize = null;
/**
* Fill the array with random numbers from 0..n-1.
*/
void scramble() {
initialSize = getSize();
int a[] = new int[initialSize.height / 2];
double f = initialSize.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(20);
} catch (InterruptedException e) {
}
}
/**
* Initialize the applet.
*/
@Override
public void init() {
String at = getParameter("alg");
if (at == null) {
at = "BubbleSort";
}
algName = at + "Algorithm";
scramble();
resize(100, 100);
addMouseListener(this);
}
@Override
public void start() {
h1 = h2 = -1;
scramble();
repaint();
showStatus(getParameter("alg"));
}
/**
* Deallocate resources of applet.
*/
@Override
public void destroy() {
removeMouseListener(this);
}
/**
* Paint the array of numbers as a list
* of horizontal lines of varying lengths.
*/
@Override
public void paint(Graphics g) {
int a[] = arr;
int y = 0;
int deltaY = 0, deltaX = 0, evenY = 0;
Dimension currentSize = getSize();
int currentHeight = currentSize.height;
int currentWidth = currentSize.width;
// Check to see if the applet has been resized since it
// started running. If so, need the deltas to make sure
// the applet is centered in its containing panel.
// The evenX and evenY are because the high and low
// watermarks are calculated from the top, but the rest
// of the lines are calculated from the bottom, which
// can lead to a discrepancy if the window is not an
// even size.
if (!currentSize.equals(initialSize)) {
evenY = (currentHeight - initialSize.height) % 2;
deltaY = (currentHeight - initialSize.height) / 2;
deltaX = (currentWidth - initialSize.width) / 2;
if (deltaY < 0) {
deltaY = 0;
evenY = 0;
}
if (deltaX < 0) {
deltaX = 0;
}
}
// Erase old lines
g.setColor(getBackground());
y = currentHeight - deltaY - 1;
for (int i = a.length; --i >= 0; y -= 2) {
g.drawLine(deltaX + arr[i], y, currentWidth, y);
}
// Draw new lines
g.setColor(Color.black);
y = currentHeight - deltaY - 1;
for (int i = a.length; --i >= 0; y -= 2) {
g.drawLine(deltaX, y, deltaX + arr[i], y);
}
if (h1 >= 0) {
g.setColor(Color.red);
y = deltaY + evenY + h1 * 2 + 1;
g.drawLine(deltaX, y, deltaX + initialSize.width, y);
}
if (h2 >= 0) {
g.setColor(Color.blue);
y = deltaY + evenY + h2 * 2 + 1;
g.drawLine(deltaX, y, deltaX + initialSize.width, y);
}
}
/**
* Update without erasing the background.
*/
@Override
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
*/
@Override
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.
*/
@Override
public synchronized void stop() {
if (algorithm != null) {
try {
algorithm.stop();
} catch (IllegalThreadStateException e) {
// ignore this exception
}
kicker = null;
}
}
/**
* 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
* synchronized with the stop() method because they both
* manipulate the common kicker variable.
*/
private synchronized void startSort() {
if (kicker == null || !kicker.isAlive()) {
kicker = new Thread(this);
kicker.start();
}
}
@Override
public void mouseClicked(MouseEvent e) {
showStatus(getParameter("alg"));
}
@Override
public void mousePressed(MouseEvent e) {
}
/**
* The user clicked in the applet. Start the clock!
*/
@Override
public void mouseReleased(MouseEvent e) {
startSort();
e.consume();
}
@Override
public void mouseEntered(MouseEvent e) {
}
@Override
public void mouseExited(MouseEvent e) {
}
@Override
public String getAppletInfo() {
return "Title: SortDemo \nAuthor: James Gosling 1.17f, 10 Apr 1995 \nA simple applet class to demonstrate a sort algorithm. \nYou can specify a sorting algorithm using the 'alg' attribute. \nWhen you click on the applet, a thread is forked which animates \nthe sorting algorithm.";
}
@Override
public String[][] getParameterInfo() {
String[][] info = {
{ "alg", "string",
"The name of the algorithm to run. You can choose from the provided algorithms or suppply your own, as long as the classes are runnable as threads and their names end in 'Algorithm.' BubbleSort is the default. Example: Use 'QSort' to run the QSortAlgorithm class." }
};
return info;
}
}
|