各种排序算法java实现收藏
插入排序:
- package org.rut.util.algorithm.support;
- import org.rut.util.algorithm.SortUtil;
- public class InsertSort implements SortUtil.Sort{
- /* (non-Javadoc)
- * @see org.rut.util.algorithm.SortUtil.Sort#sort(int[])
- */
- public void sort(int[] data) {
- int temp;
- for(int i=1;i<data.length;i++){
- for(int j=i;(j>0)&&(data[j]<data[j-1]);j--){
- SortUtil.swap(data,j,j-1);
- }
- }
- }
- }
- package org.rut.util.algorithm.support;
- import org.rut.util.algorithm.SortUtil;
- public class BubbleSort implements SortUtil.Sort{
- /* (non-Javadoc)
- * @see org.rut.util.algorithm.SortUtil.Sort#sort(int[])
- */
- public void sort(int[] data) {
- int temp;
- for(int i=0;i<data.length;i++){
- for(int j=data.length-1;j>i;j--){
- if(data[j]<data[j-1]){
- SortUtil.swap(data,j,j-1);
- }
- }
- }
- }
- }
- package org.rut.util.algorithm.support;
- import org.rut.util.algorithm.SortUtil;
- public class SelectionSort implements SortUtil.Sort {
- /*
- * (non-Javadoc)
- *
- * @see org.rut.util.algorithm.SortUtil.Sort#sort(int[])
- */
- public void sort(int[] data) {
- int temp;
- for (int i = 0; i < data.length; i++) {
- int lowIndex = i;
- for (int j = data.length - 1; j > i; j--) {
- if (data[j] < data[lowIndex]) {
- lowIndex = j;
- }
- }
- SortUtil.swap(data,i,lowIndex);
- }
- }
- }
- package org.rut.util.algorithm.support;
- import org.rut.util.algorithm.SortUtil;
- public class ShellSort implements SortUtil.Sort{
- /* (non-Javadoc)
- * @see org.rut.util.algorithm.SortUtil.Sort#sort(int[])
- */
- public void sort(int[] data) {
- for(int i=data.length/2;i>2;i/=2){
- for(int j=0;j<i;j++){
- insertSort(data,j,i);
- }
- }
- insertSort(data,0,1);
- }
- /**
- * @param data
- * @param j
- * @param i
- */
- private void insertSort(int[] data, int start, int inc) {
- int temp;
- for(int i=start+inc;i<data.length;i+=inc){
- for(int j=i;(j>=inc)&&(data[j]<data[j-inc]);j-=inc){
- SortUtil.swap(data,j,j-inc);
- }
- }
- }
- }
- package org.rut.util.algorithm.support;
- import org.rut.util.algorithm.SortUtil;
- public class QuickSort implements SortUtil.Sort{
- /* (non-Javadoc)
- * @see org.rut.util.algorithm.SortUtil.Sort#sort(int[])
- */
- public void sort(int[] data) {
- quickSort(data,0,data.length-1);
- }
- private void quickSort(int[] data,int i,int j){
- int pivotIndex=(i+j)/2;
- //swap
- SortUtil.swap(data,pivotIndex,j);
- int k=partition(data,i-1,j,data[j]);
- SortUtil.swap(data,k,j);
- if((k-i)>1) quickSort(data,i,k-1);
- if((j-k)>1) quickSort(data,k+1,j);
- }
- /**
- * @param data
- * @param i
- * @param j
- * @return
- */
- private int partition(int[] data, int l, int r,int pivot) {
- do{
- while(data[++l]<pivot);
- while((r!=0)&&data[--r]>pivot);
- SortUtil.swap(data,l,r);
- }
- while(l<r);
- SortUtil.swap(data,l,r);
- return l;
- }
- }
- package org.rut.util.algorithm.support;
- import org.rut.util.algorithm.SortUtil;
- public class ImprovedQuickSort implements SortUtil.Sort {
- private static int MAX_STACK_SIZE=4096;
- private static int THRESHOLD=10;
- /* (non-Javadoc)
- * @see org.rut.util.algorithm.SortUtil.Sort#sort(int[])
- */
- public void sort(int[] data) {
- int[] stack=new int[MAX_STACK_SIZE];
- int top=-1;
- int pivot;
- int pivotIndex,l,r;
- stack[++top]=0;
- stack[++top]=data.length-1;
- while(top>0){
- int j=stack[top--];
- int i=stack[top--];
- pivotIndex=(i+j)/2;
- pivot=data[pivotIndex];
- SortUtil.swap(data,pivotIndex,j);
- //partition
- l=i-1;
- r=j;
- do{
- while(data[++l]<pivot);
- while((r!=0)&&(data[--r]>pivot));
- SortUtil.swap(data,l,r);
- }
- while(l<r);
- SortUtil.swap(data,l,r);
- SortUtil.swap(data,l,j);
- if((l-i)>THRESHOLD){
- stack[++top]=i;
- stack[++top]=l-1;
- }
- if((j-l)>THRESHOLD){
- stack[++top]=l+1;
- stack[++top]=j;
- }
- }
- //new InsertSort().sort(data);
- insertSort(data);
- }
- /**
- * @param data
- */
- private void insertSort(int[] data) {
- int temp;
- for(int i=1;i<data.length;i++){
- for(int j=i;(j>0)&&(data[j]<data[j-1]);j--){
- SortUtil.swap(data,j,j-1);
- }
- }
- }
- }
- package org.rut.util.algorithm.support;
- import org.rut.util.algorithm.SortUtil;
- public class MergeSort implements SortUtil.Sort{
- /* (non-Javadoc)
- * @see org.rut.util.algorithm.SortUtil.Sort#sort(int[])
- */
- public void sort(int[] data) {
- int[] temp=new int[data.length];
- mergeSort(data,temp,0,data.length-1);
- }
- private void mergeSort(int[] data,int[] temp,int l,int r){
- int mid=(l+r)/2;
- if(l==r) return ;
- mergeSort(data,temp,l,mid);
- mergeSort(data,temp,mid+1,r);
- for(int i=l;i<=r;i++){
- temp[i]=data[i];
- }
- int i1=l;
- int i2=mid+1;
- for(int cur=l;cur<=r;cur++){
- if(i1==mid+1)
- data[cur]=temp[i2++];
- else if(i2>r)
- data[cur]=temp[i1++];
- else if(temp[i1]<temp[i2])
- data[cur]=temp[i1++];
- else
- data[cur]=temp[i2++];
- }
- }
- }
- package org.rut.util.algorithm.support;
- import org.rut.util.algorithm.SortUtil;
- public class ImprovedMergeSort implements SortUtil.Sort {
- private static final int THRESHOLD = 10;
- /*
- * (non-Javadoc)
- *
- * @see org.rut.util.algorithm.SortUtil.Sort#sort(int[])
- */
- public void sort(int[] data) {
- int[] temp=new int[data.length];
- mergeSort(data,temp,0,data.length-1);
- }
- private void mergeSort(int[] data, int[] temp, int l, int r) {
- int i, j, k;
- int mid = (l + r) / 2;
- if (l == r)
- return;
- if ((mid - l) >= THRESHOLD)
- mergeSort(data, temp, l, mid);
- else
- insertSort(data, l, mid - l + 1);
- if ((r - mid) > THRESHOLD)
- mergeSort(data, temp, mid + 1, r);
- else
- insertSort(data, mid + 1, r - mid);
- for (i = l; i <= mid; i++) {
- temp[i] = data[i];
- }
- for (j = 1; j <= r - mid; j++) {
- temp[r - j + 1] = data[j + mid];
- }
- int a = temp[l];
- int b = temp[r];
- for (i = l, j = r, k = l; k <= r; k++) {
- if (a < b) {
- data[k] = temp[i++];
- a = temp[i];
- } else {
- data[k] = temp[j--];
- b = temp[j];
- }
- }
- }
- /**
- * @param data
- * @param l
- * @param i
- */
- private void insertSort(int[] data, int start, int len) {
- for(int i=start+1;i<start+len;i++){
- for(int j=i;(j>start) && data[j]<data[j-1];j--){
- SortUtil.swap(data,j,j-1);
- }
- }
- }
- }
- package org.rut.util.algorithm.support;
- import org.rut.util.algorithm.SortUtil;
- public class HeapSort implements SortUtil.Sort{
- /* (non-Javadoc)
- * @see org.rut.util.algorithm.SortUtil.Sort#sort(int[])
- */
- public void sort(int[] data) {
- MaxHeap h=new MaxHeap();
- h.init(data);
- for(int i=0;i<data.length;i++)
- h.remove();
- System.arraycopy(h.queue,1,data,0,data.length);
- }
- private static class MaxHeap{
- void init(int[] data){
- this.queue=new int[data.length+1];
- for(int i=0;i<data.length;i++){
- queue[++size]=data[i];
- fixUp(size);
- }
- }
- private int size=0;
- private int[] queue;
- public int get() {
- return queue[1];
- }
- public void remove() {
- SortUtil.swap(queue,1,size--);
- fixDown(1);
- }
- //fixdown
- private void fixDown(int k) {
- int j;
- while ((j = k << 1) <= size) {
- if (j < size && queue[j]<queue[j+1])
- j++;
- if (queue[k]>queue[j]) //不用交换
- break;
- SortUtil.swap(queue,j,k);
- k = j;
- }
- }
- private void fixUp(int k) {
- while (k > 1) {
- int j = k >> 1;
- if (queue[j]>queue[k])
- break;
- SortUtil.swap(queue,j,k);
- k = j;
- }
- }
- }
- }
- package org.rut.util.algorithm;
- import org.rut.util.algorithm.support.BubbleSort;
- import org.rut.util.algorithm.support.HeapSort;
- import org.rut.util.algorithm.support.ImprovedMergeSort;
- import org.rut.util.algorithm.support.ImprovedQuickSort;
- import org.rut.util.algorithm.support.InsertSort;
- import org.rut.util.algorithm.support.MergeSort;
- import org.rut.util.algorithm.support.QuickSort;
- import org.rut.util.algorithm.support.SelectionSort;
- import org.rut.util.algorithm.support.ShellSort;
- public class SortUtil {
- public final static int INSERT = 1;
- public final static int BUBBLE = 2;
- public final static int SELECTION = 3;
- public final static int SHELL = 4;
- public final static int QUICK = 5;
- public final static int IMPROVED_QUICK = 6;
- public final static int MERGE = 7;
- public final static int IMPROVED_MERGE = 8;
- public final static int HEAP = 9;
- public static void sort(int[] data) {
- sort(data, IMPROVED_QUICK);
- }
- private static String[] name={
- "insert","bubble","selection","shell","quick","improved_quick","merge","improved_merge","heap"
- };
- private static Sort[] impl=new Sort[]{
- new InsertSort(),
- new BubbleSort(),
- new SelectionSort(),
- new ShellSort(),
- new QuickSort(),
- new ImprovedQuickSort(),
- new MergeSort(),
- new ImprovedMergeSort(),
- new HeapSort()
- };
- public static String toString(int algorithm){
- return name[algorithm-1];
- }
- public static void sort(int[] data, int algorithm) {
- impl[algorithm-1].sort(data);
- }
- public static interface Sort {
- public void sort(int[] data);
- }
- public static void swap(int[] data, int i, int j) {
- int temp = data[i];
- data[i] = data[j];
- data[j] = temp;
- }
- }
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