用Java实现几种常见的排序算法

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);
}
file://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]) file://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;
}
}

}

}

SortUtil：

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;

/**
* @author treeroot
* @since 2006-2-2
* @version 1.0
*/
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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