[JAVA]用Java实现的各种排序

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0 发表于: 2007-03-15

用Java语言实现的各种排序，包括插入排序、冒泡排序、选择排序、Shell排序、快速排序、归并排序、堆排序、SortUtil等。
插入排序：

package org.rut.util.algorithm.support;

import org.rut.util.algorithm.SortUtil;
/**
* @author treeroot
* @since 2006-2-2
* @version 1.0
*/
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 for(int j=i;(j>0)%26amp;%26amp;(data[j] SortUtil.swap(data,j,j-1);
}
}
}

}

冒泡排序：

package org.rut.util.algorithm.support;

import org.rut.util.algorithm.SortUtil;

/**
* @author treeroot
* @since 2006-2-2
* @version 1.0
*/
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 for(int j=data.length-1;j>i;j--){
if(data[j] SortUtil.swap(data,j,j-1);
}
}
}
}

}

选择排序：

package org.rut.util.algorithm.support;

import org.rut.util.algorithm.SortUtil;

/**
* @author treeroot
* @since 2006-2-2
* @version 1.0
*/
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);
}
}

}

Shell排序：

package org.rut.util.algorithm.support;

import org.rut.util.algorithm.SortUtil;

/**
* @author treeroot
* @since 2006-2-2
* @version 1.0
*/
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 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 for(int j=i;(j>=inc)%26amp;%26amp;(data[j] SortUtil.swap(data,j,j-inc);
}
}
}

}

快速排序：

package org.rut.util.algorithm.support;

import org.rut.util.algorithm.SortUtil;

/**
* @author treeroot
* @since 2006-2-2
* @version 1.0
*/
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;
file://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] while((r!=0)%26amp;%26amp;data[--r]>pivot);
SortUtil.swap(data,l,r);
}
while(l SortUtil.swap(data,l,r);
return l;
}

}

改进后的快速排序：

package org.rut.util.algorithm.support;

import org.rut.util.algorithm.SortUtil;

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

file://partition
l=i-1;
r=j;
do{
while(data[++l] while((r!=0)%26amp;%26amp;(data[--r]>pivot));
SortUtil.swap(data,l,r);
}
while(l 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;
}

}
file://new InsertSort().sort(data);
insertSort(data);
}
/**
* @param data
*/
private void insertSort(int[] data) {
int temp;
for(int i=1;i for(int j=i;(j>0)%26amp;%26amp;(data[j] SortUtil.swap(data,j,j-1);
}
}
}

}

归并排序：

package org.rut.util.algorithm.support;

import org.rut.util.algorithm.SortUtil;

/**
* @author treeroot
* @since 2006-2-2
* @version 1.0
*/
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=data; Q5iuK#/
} `w]=xe
int i1=l; &M~*w~w`
int i2=mid+1; 8(D>ws$
for(int cur=l;cur<=r;cur++){ w@4q D
if(i1==mid+1) uA:|#mO
data[cur]=temp[i2++]; ?K{CjwE.M
else if(i2>r) ycRy!0l
data[cur]=temp[i1++]; dV8mI,h
else if(temp[i1] data[cur]=temp[i1++]; $\$5::}r
else b3x!tuQn
data[cur]=temp[i2++]; 9>qR6k?
} waW2$9O
} A5+vzu^
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} .wx;!9
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改进后的归并排序: v?)JM+
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package org.rut.util.algorithm.support; +BM(0M+
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import org.rut.util.algorithm.SortUtil; z![RC59S
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/** S?*v p=
* @author treeroot N|T%cdh:/
* @since 2006-2-2 qp^O\>c
* @version 1.0 t*82^KDU
*/ #5N#^#r"
public class ImprovedMergeSort implements SortUtil.Sort { MVH^["AeR
d5%A64?
private static final int THRESHOLD = 10; ' V;cA$ $
H6x~mZu_:T
/* @X"p"3V
* (non-Javadoc) \QstcsEt
* l[l('-f
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) SPeSe/
*/ S-npJh 6
public void sort(int[] data) { sE-E\+
int[] temp=new int[data.length]; GNqw]@'Yf
mergeSort(data,temp,0,data.length-1); ~9p*zC3M
} Ytc
sbrU;X_S
private void mergeSort(int[] data, int[] temp, int l, int r) { x;l\#x/<
int i, j, k; "ZNiTND
int mid = (l + r) / 2; &|IY=$-
if (l == r) ^{_`jE
return; <jQ?l%\
if ((mid - l) >= THRESHOLD) $VhUZGuG>
mergeSort(data, temp, l, mid); ,;'9PsIS^
else v}IkY
insertSort(data, l, mid - l + 1); ngcXS2S_
if ((r - mid) > THRESHOLD) ?3Se=7 k
mergeSort(data, temp, mid + 1, r); SY["dcx+
else .:*V CDOM
insertSort(data, mid + 1, r - mid); nfq
A}FEM[2
for (i = l; i <= mid; i++) { ^* ^te+N
temp = data; "?EA G
} Mje6Q
for (j = 1; j <= r - mid; j++) { r Ka7[/
temp[r - j + 1] = data[j + mid]; x1]^].#Eo
} 0"kNn5
int a = temp[l]; +iir]"8
int b = temp[r]; !,+peMy
for (i = l, j = r, k = l; k <= r; k++) { Y{B|*[xM
if (a < b) { @O5-w
data[k] = temp[i++]; `ux U H#
a = temp; D:U:( pg
} else { 4T`u?T]
data[k] = temp[j--]; d Ayof=
b = temp[j]; 3205gI,
} K~5QL/=1
} p}hOkx4R\
} 7KnZ
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/** =M>1;Qr<Z/
* @param data D%N^iJC,9
* @param l =2BGS\$#
* @param i j#"?Oe{_1
*/ t(-noy)
private void insertSort(int[] data, int start, int len) { GN /]^{D
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); YBN@{P$
} _p\
} qgvg MWj
} L@2T
} }a,j1r_Hl&
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堆排序： xI55pj*
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package org.rut.util.algorithm.support; Pdmfn8I]%
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import org.rut.util.algorithm.SortUtil; '^'vafs-/@
U,yU-8z/
/** :D8V*F6P
* @author treeroot ~&4Hc%*IB
* @since 2006-2-2 8C#R
* @version 1.0 UJ1iXV[h"
*/ hW$B;
public class HeapSort implements SortUtil.Sort{ V~tq _
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/* (non-Javadoc) F=U3o=-:
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ,o& &d.
*/ ^&MMtWR
public void sort(int[] data) { $J>GCY
MaxHeap h=new MaxHeap(); Fd":\7p
h.init(data); d&4]?8}=.
for(int i=0;i h.remove(); XZLo*C!MG
System.arraycopy(h.queue,1,data,0,data.length); @tWyc%t
} cJd~UQ<k
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private static class MaxHeap{ rn#FmM
:3M2zV cf
void init(int[] data){ Q3vC^}Dmr
this.queue=new int[data.length+1]; 4d#w}
for(int i=0;i queue[++size]=data; NJ^`vWi
fixUp(size); z 0]K:YV_
} [x ?38
} JziuwL5,
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private int size=0; o@mZ6!ax3
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private int[] queue; ?2zVWZ
\ce (/I
public int get() { `[p*qsp_
return queue[1]; Fq>=0 )
} R5c Ya
"Lk-R5iFd
public void remove() { @.;] $N&J
SortUtil.swap(queue,1,size--); ,)e&u1'
fixDown(1); &Ed7|k]H
} _fx0-S*$
file://fixdown 4NT zK
private void fixDown(int k) { HgPRz C
int j; &4Q(>"iL4
while ((j = k << 1) <= size) { sgp5b$2T.
if (j < size %26amp;%26amp; queue[j] j++; $_CE!_G&)
if (queue[k]>queue[j]) file://不用交换 S C7Tp4
break; rVgz+'rFD[
SortUtil.swap(queue,j,k); aT1T.3 a
k = j; 9otA5I^v
} wegu1Ny
} ~G|un}g=
private void fixUp(int k) { SN+B8*!
while (k > 1) { qP{S!Z(
int j = k >> 1; C` ?6`$Y
if (queue[j]>queue[k]) 86NAa6BW
break; W iqlc
SortUtil.swap(queue,j,k); 7\m.xWX e
k = j; sVtxh]
} <`,pyvR Kv
} 4A^=4"BCV
!Z[dK{f"
} eIBHAdU+g/
.|[ZEXq
} EN/>f=%
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SortUtil： eSo/1D
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package org.rut.util.algorithm; }6ObQa43
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import org.rut.util.algorithm.support.BubbleSort; MF:]J
import org.rut.util.algorithm.support.HeapSort; VN`T:!&
import org.rut.util.algorithm.support.ImprovedMergeSort; X_GR{z%
import org.rut.util.algorithm.support.ImprovedQuickSort; "9,z"k
import org.rut.util.algorithm.support.InsertSort; /cHd&i,>
import org.rut.util.algorithm.support.MergeSort; [lZo'o
import org.rut.util.algorithm.support.QuickSort; d MQ]=
import org.rut.util.algorithm.support.SelectionSort; Q;{[U!\:
import org.rut.util.algorithm.support.ShellSort; 5ws|4V
iJ.P&T9
/** Z0*Lm+d9z
* @author treeroot y57]q#k
* @since 2006-2-2 H }w"4s
* @version 1.0 eFDhJ
*/ ?O(KmDH
public class SortUtil { 4|*b{Ni
public final static int INSERT = 1; t I}@1
public final static int BUBBLE = 2; Ah:!
public final static int SELECTION = 3; >^}nk04
public final static int SHELL = 4; WM$)T6M
public final static int QUICK = 5; ,FRFH8p
public final static int IMPROVED_QUICK = 6; l9"4"+?j<
public final static int MERGE = 7; ,4W|e!
public final static int IMPROVED_MERGE = 8; w#.Tp-AZ;\
public final static int HEAP = 9; \pI)tnu6'U
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public static void sort(int[] data) { F[PIo7?K
sort(data, IMPROVED_QUICK); [<SM*fQ>t
} 6v~` jS%3
private static String[] name={ @V{s'V
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" *V+6409m
}; :Awnj!KNCc
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private static Sort[] impl=new Sort[]{ i'&KoR?
new InsertSort(), KWtLrZ(j
new BubbleSort(), .w5#V|
new SelectionSort(), z d 9Gi5&
new ShellSort(), +E8\g
new QuickSort(), )6mx\t
new ImprovedQuickSort(), cx%[hM09
new MergeSort(), 3=o^Vv
new ImprovedMergeSort(), !z@QoD
new HeapSort() =f'MiU!p6
}; :M" NB+T
#hL<9j
public static String toString(int algorithm){ {Ic~}>w
return name[algorithm-1]; $nN`K*%
} Eq$Q%'5*ua
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public static void sort(int[] data, int algorithm) { ]jo^P5\h>
impl[algorithm-1].sort(data); bg.f';C
} XE8~R5
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public static interface Sort { 2 mM0\ja
public void sort(int[] data); &_X6m0z
} |lH~nU.*
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public static void swap(int[] data, int i, int j) { v_Om3i9$E
int temp = data; +zodkB~)
data = data[j]; s@C KZ`
data[j] = temp; 9L3#aE]C
} i8R.Wl$l
} 8joJe>9VJ