[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; (t4i&7-
} Oyl~j#h
int i1=l; 7H7 Xbi@
int i2=mid+1; 6$`<Y?
for(int cur=l;cur<=r;cur++){ _{*} )&!M
if(i1==mid+1) 0,Ds1y^
data[cur]=temp[i2++]; bfxE}>
else if(i2>r) 5nG\J g7
data[cur]=temp[i1++]; "Lp.*o
else if(temp[i1] data[cur]=temp[i1++]; /vQ)$;xf#
else */aY$aWv
data[cur]=temp[i2++]; .n 9.y8C
} V._-iw]v
} 9[eiN
$@AJg
} yzS]FwW7
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改进后的归并排序: ~;"eNg{T
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package org.rut.util.algorithm.support; ,1]UOQ>AP
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import org.rut.util.algorithm.SortUtil; X5)D[aE6
529;_|
/** K; #FU
* @author treeroot #VQZ"7nI@
* @since 2006-2-2 VfnL-bDGV
* @version 1.0 W|PAI[N
*/ j=0kxvp
public class ImprovedMergeSort implements SortUtil.Sort { l)u%`Hcn
!wYN",R-
private static final int THRESHOLD = 10; ?JuJu1
CsR[@&n'
/* mF6-f#t>H+
* (non-Javadoc) 6uRE9h|
* xdSMYH{2A
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) z g7Q`
*/ YD4I2'E
public void sort(int[] data) { a*M|_&MH*
int[] temp=new int[data.length]; %['NPs%B
mergeSort(data,temp,0,data.length-1); WBjJ)vCA.
} Kzev] er
}e7Rpgu
private void mergeSort(int[] data, int[] temp, int l, int r) { `m 5\
int i, j, k; Es=G' au
int mid = (l + r) / 2; [@K'}\U^+
if (l == r) H1N@E}>|
return; (kL"*y/"p
if ((mid - l) >= THRESHOLD) 4 ]oe`yx
mergeSort(data, temp, l, mid); x?i wtZ@
else %JeNDXbI4
insertSort(data, l, mid - l + 1); m(f`=+lqI`
if ((r - mid) > THRESHOLD) dle\}Sy=
mergeSort(data, temp, mid + 1, r); gwaSgV$z
else xF_u:}7`
insertSort(data, mid + 1, r - mid); IOHWb&N6
XpAJP++
for (i = l; i <= mid; i++) { z_c-1iXCW
temp = data; $WYt`U;*lj
} ekx(i QA
for (j = 1; j <= r - mid; j++) { [if(B\&
temp[r - j + 1] = data[j + mid]; -jjB2xP
} 8:Hh;nl
int a = temp[l]; 5OdsT-y
int b = temp[r]; i4YskhT
for (i = l, j = r, k = l; k <= r; k++) { h7]+#U]mi
if (a < b) { }s2CND
data[k] = temp[i++]; ~}OaX+!
a = temp; ;D'm=uOl
} else { bdrE2m
data[k] = temp[j--]; zC*FeqFL<
b = temp[j]; l0&Fm:))k
} {aE[h[=r
} u6C_*i{2
} fw%p_Cm
C:1(<1K
/** a`Bp^(f}
* @param data AO<T6VK
* @param l or-k~1D
* @param i $HwF:L)*
*/ ]ZLF=
private void insertSort(int[] data, int start, int len) { O72g'qFPE
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); +v/y{8Fu
} -zECxHjx
} CH7a4qL`
} AMrYT+1
} :[a*I6/^
F-kjv\
堆排序： j+!u=E
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package org.rut.util.algorithm.support; w/NT5
_;}$/
import org.rut.util.algorithm.SortUtil; } W]A`-Jv
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/** :{<|,3oNdR
* @author treeroot Q &/5B
* @since 2006-2-2 c@>ztQU*
* @version 1.0 KXMf2)pa
*/ Lginps[la
public class HeapSort implements SortUtil.Sort{ .*NPoW4Kv
YusmMsN?
/* (non-Javadoc) MTt8O+J?P~
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) vU *: M8k
*/ x|Uwk=;X|s
public void sort(int[] data) { )d[n-Si
MaxHeap h=new MaxHeap(); jP+{2)z"W
h.init(data); d8Vqmrc~
for(int i=0;i h.remove(); {X?Aj >l
System.arraycopy(h.queue,1,data,0,data.length); D <~UaHfk
} @zGF9O<3,@
M8lw; (
private static class MaxHeap{ n\9IRuYO
l_k:OZ
void init(int[] data){ XY)X-K$
this.queue=new int[data.length+1]; xkf2;
for(int i=0;i queue[++size]=data; W. d',4)
fixUp(size); YUSrZ9Yg
} Z7wl~Hk
} rFcz0
~xzr8 P
private int size=0; b!t[PShw^
#2|biTJ
private int[] queue; P}'B~~9W
uznqq}
public int get() { }#g]qK
return queue[1]; /y1+aTiJ
} L%[>z'Zp
="G2I\
public void remove() { 7j|CWurvq
SortUtil.swap(queue,1,size--); i&(1<S>P
fixDown(1); L0VZ>!*o
} H8g6ZCU~
file://fixdown .Z]hS7t
private void fixDown(int k) { ;u`8pF!_eE
int j; !,$K;L
while ((j = k << 1) <= size) { Bor_(eL^
if (j < size %26amp;%26amp; queue[j] j++; RaLV@>jPm
if (queue[k]>queue[j]) file://不用交换 Z<<=2Xl(
break; 3L2NenJB
SortUtil.swap(queue,j,k); r5[pT(XT]
k = j; 8(ZQM01;
} kjQW9QJ<
} &qY]W=9uK
private void fixUp(int k) { F<h+d917
while (k > 1) { {$t*XTY6R
int j = k >> 1; %1 RWF6
if (queue[j]>queue[k]) [PXq<ST
break; {KDN|o+%
SortUtil.swap(queue,j,k); ;t>4VA
k = j; =LY`K#
} 9PV]bt,
} C-ORI}o
dU_;2d$
} FD!8o
6yYjZ<
} %qsl<_&
] 0L=+=w
SortUtil： ZweAY.]e
;4dFL\KU
package org.rut.util.algorithm; VZ IY=Q>g
h#Rza-?"\
import org.rut.util.algorithm.support.BubbleSort; hrJ(][8
import org.rut.util.algorithm.support.HeapSort; Yt=)=n
import org.rut.util.algorithm.support.ImprovedMergeSort; Bi9Q8#lh
import org.rut.util.algorithm.support.ImprovedQuickSort; g/l:q&Q<
import org.rut.util.algorithm.support.InsertSort; @=z.^I30
import org.rut.util.algorithm.support.MergeSort; wIAH,3!
import org.rut.util.algorithm.support.QuickSort; !m))Yp-"H
import org.rut.util.algorithm.support.SelectionSort; N,B!D~@
import org.rut.util.algorithm.support.ShellSort; yQ^,>eh
QiA}0q3]0
/** D HQxu4
* @author treeroot #Rfcp!
* @since 2006-2-2 #|+4`Gf^
* @version 1.0 tf54EIy5Y
*/ Q"NZE
public class SortUtil { f.j<VKF}
public final static int INSERT = 1; A ?tna6W:
public final static int BUBBLE = 2; *BrGh
public final static int SELECTION = 3; izcjI.3e,
public final static int SHELL = 4; k8J zey]X
public final static int QUICK = 5; oM>UIDCY_v
public final static int IMPROVED_QUICK = 6; AMB{Fssz
public final static int MERGE = 7; sWse (_2
public final static int IMPROVED_MERGE = 8; mVS^HQ:
public final static int HEAP = 9; Hr=|xw8.
k:V9_EI=
public static void sort(int[] data) { hl0X,G+@
sort(data, IMPROVED_QUICK); 9BlpqS:P&
} :!cK?H$+
private static String[] name={ A[@koLCL
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" 6d5J*y2
}; RX{} UmU<
kWa5=BW2f
private static Sort[] impl=new Sort[]{ ,K@[+ R!
new InsertSort(), du'`&{_/
new BubbleSort(), ' A+L #
new SelectionSort(), PPy~dp
new ShellSort(), %nUN
new QuickSort(), y5*zyd
new ImprovedQuickSort(), ]8"U)fzmc.
new MergeSort(), }'}n~cA.{
new ImprovedMergeSort(), %${$P+a`D
new HeapSort() /Q)I5sL@E
}; `<~=6H
8G$BQ
public static String toString(int algorithm){ <L*`WO]\l
return name[algorithm-1]; wA7\K~fHV
} #X1a v
7. $wK.
public static void sort(int[] data, int algorithm) { >}+R+''nR
impl[algorithm-1].sort(data); :81d~f7
} {A< 961
h|PC?@jp
public static interface Sort { 6~jAh@-
public void sort(int[] data); 1_!?wMo:f
} :_xfi9L~W0
7f k)a
public static void swap(int[] data, int i, int j) { ~a4Y8r
int temp = data; Vh;|qF 9
data = data[j]; vm;%713#1
data[j] = temp; n8)&1 q?V
} $nW9VMa
} ?Bq^#i|m