1 package org.rut.util.algorithm.support;
2
3 import org.rut.util.algorithm.SortUtil;
4 /**
5 * @author treeroot
6 * @since 2006-2-2
7 * @version 1.0
8 */
9 public class InsertSort implements SortUtil.Sort{
10
11 /* (non-Javadoc)
12 * @see org.rut.util.algorithm.SortUtil.Sort#sort(int[])
13 */
14 public void sort(int[] data) {
15 int temp;
16 for(int i=1;i<data.length;i++){
17 for(int j=i;(j>0)&&(data[j]<data[j-1]);j--){
18 SortUtil.swap(data,j,j-1);
19 }
20 }
21 }
22
23 }
24 冒泡排序:
25
26 package org.rut.util.algorithm.support;
27
28 import org.rut.util.algorithm.SortUtil;
29
30 /**
31 * @author treeroot
32 * @since 2006-2-2
33 * @version 1.0
34 */
35 public class BubbleSort implements SortUtil.Sort{
36
37 /* (non-Javadoc)
38 * @see org.rut.util.algorithm.SortUtil.Sort#sort(int[])
39 */
40 public void sort(int[] data) {
41 int temp;
42 for(int i=0;i<data.length;i++){
43 for(int j=data.length-1;j>i;j--){
44 if(data[j]<data[j-1]){
45 SortUtil.swap(data,j,j-1);
46 }
47 }
48 }
49 }
50
51 }
52
53 选择排序:
54
55 package org.rut.util.algorithm.support;
56
57 import org.rut.util.algorithm.SortUtil;
58
59 /**
60 * @author treeroot
61 * @since 2006-2-2
62 * @version 1.0
63 */
64 public class SelectionSort implements SortUtil.Sort {
65
66 /*
67 * (non-Javadoc)
68 *
69 * @see org.rut.util.algorithm.SortUtil.Sort#sort(int[])
70 */
71 public void sort(int[] data) {
72 int temp;
73 for (int i = 0; i >< data.length; i++) {
74 int lowIndex = i;
75 for (int j = data.length - 1; j > i; j--) {
76 if (data[j] < data[lowIndex]) {
77 lowIndex = j;
78 }
79 }
80 SortUtil.swap(data,i,lowIndex);
81 }
82 }
83
84 }
85
86 Shell排序:
87
88 package org.rut.util.algorithm.support;
89
90 import org.rut.util.algorithm.SortUtil;
91
92 /**
93 * @author treeroot
94 * @since 2006-2-2
95 * @version 1.0
96 */
97 public class ShellSort implements SortUtil.Sort{
98
99 /* (non-Javadoc)
100 * @see org.rut.util.algorithm.SortUtil.Sort#sort(int[])
101 */
102 public void sort(int[] data) {
103 for(int i=data.length/2;i>2;i/=2){
104 for(int j=0;j<i;j++){
105 insertSort(data,j,i);
106 }
107 }
108 insertSort(data,0,1);
109 }
110
111 /**
112 * @param data
113 * @param j
114 * @param i
115 */
116 private void insertSort(int[] data, int start, int inc) {
117 int temp;
118 for(int i=start+inc;i<data.length;i+=inc){
119 for(int j=i;(j>=inc)&&(data[j]<data[j-inc]);j-=inc){
120 SortUtil.swap(data,j,j-inc);
121 }
122 }
123 }
124
125 }
126
127 快速排序:
128
129 package org.rut.util.algorithm.support;
130
131 import org.rut.util.algorithm.SortUtil;
132
133 /**
134 * @author treeroot
135 * @since 2006-2-2
136 * @version 1.0
137 */
138 public class QuickSort implements SortUtil.Sort{
139
140 /* (non-Javadoc)
141 * @see org.rut.util.algorithm.SortUtil.Sort#sort(int[])
142 */
143 public void sort(int[] data) {
144 quickSort(data,0,data.length-1);
145 }
146 private void quickSort(int[] data,int i,int j){
147 int pivotIndex=(i+j)/2;
148 //swap
149 SortUtil.swap(data,pivotIndex,j);
150
151 int k=partition(data,i-1,j,data[j]);
152 SortUtil.swap(data,k,j);
153 if((k-i)>1) quickSort(data,i,k-1);
154 if((j-k)>1) quickSort(data,k+1,j);
155
156 }
157 /**
158 * @param data
159 * @param i
160 * @param j
161 * @return
162 */
163 private int partition(int[] data, int l, int r,int pivot) {
164 do{
165 while(data[++l]<pivot);
166 while((r!=0)&&data[--r]>pivot);
167 SortUtil.swap(data,l,r);
168 }
169 while(l<r);
170 SortUtil.swap(data,l,r);
171 return l;
172 }
173
174 }
175 改进后的快速排序:
176
177 package org.rut.util.algorithm.support;
178
179 import org.rut.util.algorithm.SortUtil;
180
181 /**
182 * @author treeroot
183 * @since 2006-2-2
184 * @version 1.0
185 */
186 public class ImprovedQuickSort implements SortUtil.Sort {
187
188 private static int MAX_STACK_SIZE=4096;
189 private static int THRESHOLD=10;
190 /* (non-Javadoc)
191 * @see org.rut.util.algorithm.SortUtil.Sort#sort(int[])
192 */
193 public void sort(int[] data) {
194 int[] stack=new int[MAX_STACK_SIZE];
195
196 int top=-1;
197 int pivot;
198 int pivotIndex,l,r;
199
200 stack[++top]=0;
201 stack[++top]=data.length-1;
202
203 while(top>0){
204 int j=stack[top--];
205 int i=stack[top--];
206
207 pivotIndex=(i+j)/2;
208 pivot=data[pivotIndex];
209
210 SortUtil.swap(data,pivotIndex,j);
211
212 //partition
213 l=i-1;
214 r=j;
215 do{
216 while(data[++l]<pivot);
217 while((r!=0)&&(data[--r]>pivot));
218 SortUtil.swap(data,l,r);
219 }
220 while(l<r);
221 SortUtil.swap(data,l,r);
222 SortUtil.swap(data,l,j);
223
224 if((l-i)>THRESHOLD){
225 stack[++top]=i;
226 stack[++top]=l-1;
227 }
228 if((j-l)>THRESHOLD){
229 stack[++top]=l+1;
230 stack[++top]=j;
231 }
232
233 }
234 //new InsertSort().sort(data);
235 insertSort(data);
236 }
237 /**
238 * @param data
239 */
240 private void insertSort(int[] data) {
241 int temp;
242 for(int i=1;i<data.length;i++){
243 for(int j=i;(j>0)&&(data[j]<data[j-1]);j--){
244 SortUtil.swap(data,j,j-1);
245 }
246 }
247 }
248
249 }
250
251 归并排序:
252
253 package org.rut.util.algorithm.support;
254
255 import org.rut.util.algorithm.SortUtil;
256
257 /**
258 * @author treeroot
259 * @since 2006-2-2
260 * @version 1.0
261 */
262 public class MergeSort implements SortUtil.Sort{
263
264 /* (non-Javadoc)
265 * @see org.rut.util.algorithm.SortUtil.Sort#sort(int[])
266 */
267 public void sort(int[] data) {
268 int[] temp=new int[data.length];
269 mergeSort(data,temp,0,data.length-1);
270 }
271
272 private void mergeSort(int[] data,int[] temp,int l,int r){
273 int mid=(l+r)/2;
274 if(l==r) return ;
275 mergeSort(data,temp,l,mid);
276 mergeSort(data,temp,mid+1,r);
277 for(int i=l;i<=r;i++){
278 temp[i]=data[i];
279 }
280 int i1=l;
281 int i2=mid+1;
282 for(int cur=l;cur<=r;cur++){
283 if(i1==mid+1)
284 data[cur]=temp[i2++];
285 else if(i2>r)
286 data[cur]=temp[i1++];
287 else if(temp[i1]<temp[i2])
288 data[cur]=temp[i1++];
289 else
290 data[cur]=temp[i2++];
291 }
292 }
293
294 }
295
296 改进后的归并排序:
297
298 package org.rut.util.algorithm.support;
299
300 import org.rut.util.algorithm.SortUtil;
301
302 /**
303 * @author treeroot
304 * @since 2006-2-2
305 * @version 1.0
306 */
307 public class ImprovedMergeSort implements SortUtil.Sort {
308
309 private static final int THRESHOLD = 10;
310
311 /*
312 * (non-Javadoc)
313 *
314 * @see org.rut.util.algorithm.SortUtil.Sort#sort(int[])
315 */
316 public void sort(int[] data) {
317 int[] temp=new int[data.length];
318 mergeSort(data,temp,0,data.length-1);
319 }
320
321 private void mergeSort(int[] data, int[] temp, int l, int r) {
322 int i, j, k;
323 int mid = (l + r) / 2;
324 if (l == r)
325 return;
326 if ((mid - l) >= THRESHOLD)
327 mergeSort(data, temp, l, mid);
328 else
329 insertSort(data, l, mid - l + 1);
330 if ((r - mid) > THRESHOLD)
331 mergeSort(data, temp, mid + 1, r);
332 else
333 insertSort(data, mid + 1, r - mid);
334
335 for (i = l; i <= mid; i++) {
336 temp[i] = data[i];
337 }
338 for (j = 1; j <= r - mid; j++) {
339 temp[r - j + 1] = data[j + mid];
340 }
341 int a = temp[l];
342 int b = temp[r];
343 for (i = l, j = r, k = l; k <= r; k++) {
344 if (a < b) {
345 data[k] = temp[i++];
346 a = temp[i];
347 } else {
348 data[k] = temp[j--];
349 b = temp[j];
350 }
351 }
352 }
353
354 /**
355 * @param data
356 * @param l
357 * @param i
358 */
359 private void insertSort(int[] data, int start, int len) {
360 for(int i=start+1;i<start+len;i++){
361 for(int j=i;(j>start) && data[j]<data[j-1];j--){
362 SortUtil.swap(data,j,j-1);
363 }
364 }
365 }
366
367 }
368 堆排序:
369
370 package org.rut.util.algorithm.support;
371
372 import org.rut.util.algorithm.SortUtil;
373
374 /**
375 * @author treeroot
376 * @since 2006-2-2
377 * @version 1.0
378 */
379 public class HeapSort implements SortUtil.Sort{
380
381 /* (non-Javadoc)
382 * @see org.rut.util.algorithm.SortUtil.Sort#sort(int[])
383 */
384 public void sort(int[] data) {
385 MaxHeap h=new MaxHeap();
386 h.init(data);
387 for(int i=0;i<data.length;i++)
388 h.remove();
389 System.arraycopy(h.queue,1,data,0,data.length);
390 }
391
392
393 private static class MaxHeap{
394
395
396 void init(int[] data){
397 this.queue=new int[data.length+1];
398 for(int i=0;i<data.length;i++){
399 queue[++size]=data[i];
400 fixUp(size);
401 }
402 }
403
404 private int size=0;
405
406 private int[] queue;
407
408 public int get() {
409 return queue[1];
410 }
411
412 public void remove() {
413 SortUtil.swap(queue,1,size--);
414 fixDown(1);
415 }
416 //fixdown
417 private void fixDown(int k) {
418 int j;
419 while ((j = k ><< 1) <= size) {
420 if (j < size && queue[j]<queue[j+1])
421 j++;
422 if (queue[k]>queue[j]) //不用交换
423 break;
424 SortUtil.swap(queue,j,k);
425 k = j;
426 }
427 }
428 private void fixUp(int k) {
429 while (k > 1) {
430 int j = k >> 1;
431 if (queue[j]>queue[k])
432 break;
433 SortUtil.swap(queue,j,k);
434 k = j;
435 }
436 }
437
438 }
439
440 }
441
442
443
444 SortUtil:
445
446 package org.rut.util.algorithm;
447
448 import org.rut.util.algorithm.support.BubbleSort;
449 import org.rut.util.algorithm.support.HeapSort;
450 import org.rut.util.algorithm.support.ImprovedMergeSort;
451 import org.rut.util.algorithm.support.ImprovedQuickSort;
452 import org.rut.util.algorithm.support.InsertSort;
453 import org.rut.util.algorithm.support.MergeSort;
454 import org.rut.util.algorithm.support.QuickSort;
455 import org.rut.util.algorithm.support.SelectionSort;
456 import org.rut.util.algorithm.support.ShellSort;
457
458 /**
459 * @author treeroot
460 * @since 2006-2-2
461 * @version 1.0
462 */
463 public class SortUtil {
464 public final static int INSERT = 1;
465
466 public final static int BUBBLE = 2;
467
468 public final static int SELECTION = 3;
469
470 public final static int SHELL = 4;
471
472 public final static int QUICK = 5;
473
474 public final static int IMPROVED_QUICK = 6;
475
476 public final static int MERGE = 7;
477
478 public final static int IMPROVED_MERGE = 8;
479
480 public final static int HEAP = 9;
481
482 public static void sort(int[] data) {
483 sort(data, IMPROVED_QUICK);
484 }
485 private static String[] name={
486 "insert","bubble","selection","shell","quick","improved_quick","merge","improved_merge","heap"
487 };
488
489 private static Sort[] impl=new Sort[]{
490 new InsertSort(),
491 new BubbleSort(),
492 new SelectionSort(),
493 new ShellSort(),
494 new QuickSort(),
495 new ImprovedQuickSort(),
496 new MergeSort(),
497 new ImprovedMergeSort(),
498 new HeapSort()
499 };
500
501 public static String toString(int algorithm){
502 return name[algorithm-1];
503 }
504
505 public static void sort(int[] data, int algorithm) {
506 impl[algorithm-1].sort(data);
507 }
508
509 public static interface Sort {
510 public void sort(int[] data);
511 }
512
513 public static void swap(int[] data, int i, int j) {
514 int temp = data[i];
515 data[i] = data[j];
516 data[j] = temp;
517 }
518 }
519
(转)http://duketian.blog.chinajavaworld.com/entry/3852/0/