[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; `>Tu|3%\
} 4rT*tW"U
int i1=l; {PP9$>4`l
int i2=mid+1; >^Q&nkB"B
for(int cur=l;cur<=r;cur++){ d_UN0YT<
if(i1==mid+1) $ i)bq6
data[cur]=temp[i2++]; (_kp{0r#
else if(i2>r) C&LBr|
data[cur]=temp[i1++]; GG064zPq7
else if(temp[i1] data[cur]=temp[i1++]; H={DB
else N[]Hc
data[cur]=temp[i2++]; ='ZRfb&
} zLs|tJOVp
} EC2+`HJ"
K5ZC:Ks
} ZX!r1*c 6
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改进后的归并排序: o+`6LKg;
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package org.rut.util.algorithm.support; uzmk6G v
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import org.rut.util.algorithm.SortUtil; WG*t::NN
h^,8rd
/** geQ{EwO8n
* @author treeroot CTt vyr
* @since 2006-2-2 X'.qYsS
* @version 1.0 t*z~5_/
*/ _{t9 x\=
public class ImprovedMergeSort implements SortUtil.Sort { H9h@sSg
{FRAv(,\
private static final int THRESHOLD = 10; C{sLz9
B\J^=W+`
/* z,qRcO&
* (non-Javadoc) T2}FYVj?!g
* Zfk*HV#\
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) "|;:>{JC
*/ R>DaOH2K*
public void sort(int[] data) { rG#Z=*b%
int[] temp=new int[data.length]; Q-ni|
mergeSort(data,temp,0,data.length-1); L;gO;vO
} obdFS,JxxG
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private void mergeSort(int[] data, int[] temp, int l, int r) { M?=;JJ:
int i, j, k; (D@A74q\'
int mid = (l + r) / 2; }2K$^uR
if (l == r) | 8qBm
return; b-3*Nl_%
if ((mid - l) >= THRESHOLD) K3\#E/Ox
mergeSort(data, temp, l, mid); z4&iK)x
else >^Se'SE]
insertSort(data, l, mid - l + 1); f;}EhG'
if ((r - mid) > THRESHOLD) aM7uBx\8 5
mergeSort(data, temp, mid + 1, r); G^q3Z#P
else nXjPx@
insertSort(data, mid + 1, r - mid); :4^\3~i1X
V5p= mmnA,
for (i = l; i <= mid; i++) { G_>#Js
temp = data; 5 H#W[^s"
} 9-]i.y
for (j = 1; j <= r - mid; j++) { <hwy*uBrD
temp[r - j + 1] = data[j + mid]; ^$&k5e/}C
} 1? FrJ6V
int a = temp[l]; VUI|.76g
int b = temp[r]; +7t6k7]c
for (i = l, j = r, k = l; k <= r; k++) { %,hV[[@.
if (a < b) { R\XKMF3mN3
data[k] = temp[i++]; z,{<Nm7&F
a = temp; c1%H4j4/
} else { "R8KQj
data[k] = temp[j--]; w '3#&k+
b = temp[j]; M-i_#EWP
} !"+'A)Nve
} bFA!=uvA
} \,J/ r!
= waA`Id
/** ~tOAT;g}q
* @param data iD= p\
* @param l >Z1q j>
* @param i &qS[%K )
*/ w`l{LHrR
private void insertSort(int[] data, int start, int len) { &K/FyY5
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); \^#~@9
} _0gKK2
} 8u!"#S#>a
} &YDK (&>
} iMfngIs |
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堆排序： kh%{C]".1
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package org.rut.util.algorithm.support; Z'H5,)j0R
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import org.rut.util.algorithm.SortUtil; g#]wLm#
@y31NH(
/** waKT{5k
* @author treeroot w1UA?+43
* @since 2006-2-2 >AJSqgHQ,
* @version 1.0 S~]mWxgZ
*/ WW~+?g5
public class HeapSort implements SortUtil.Sort{ G|\^{5
OM{WI27
/* (non-Javadoc) #M A4
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) #[#KL/i)$
*/ wCk~CkC?
public void sort(int[] data) { P]z[v)}
MaxHeap h=new MaxHeap(); ]jpu,jz:
h.init(data); b~-%c_
for(int i=0;i h.remove(); #lU9yv
System.arraycopy(h.queue,1,data,0,data.length); }-~T<egF
} LL$_zK{
Ged[#Q
private static class MaxHeap{ lDmtQk-SN
fu$R7
void init(int[] data){ fL]Pztsk+
this.queue=new int[data.length+1]; l|5fE1K9U
for(int i=0;i queue[++size]=data; ;\MW$/[JCy
fixUp(size); Hi]cxD*`
} mw5?[@G-
} CkswJ:z)sc
;l}- Z@! /
private int size=0; 1n\ t+F
BPr^D0P
private int[] queue; xJ2*LM-
Ma|qHg
public int get() { I}2P>)K
return queue[1]; )!tK[K?5
} =vT<EW}[
fg#x7v4O
public void remove() { ly WwGR
SortUtil.swap(queue,1,size--); ~zHg[X*
fixDown(1); >c-fI$]
} E\;ikX&1
file://fixdown +/D>|loRC
private void fixDown(int k) { >3u]OSb
int j; Dz./w
while ((j = k << 1) <= size) { }h 3K@R
if (j < size %26amp;%26amp; queue[j] j++; .vG,fuf8
if (queue[k]>queue[j]) file://不用交换 7Ol}EPf#
break; H:H6b
SortUtil.swap(queue,j,k); OCy0#aPRS
k = j; BnRN;bu
} NzKUtwnIz
} Ej7 /X ~
private void fixUp(int k) { Blq8H"3!:
while (k > 1) { Vb qto|X@
int j = k >> 1; h$N0D !
if (queue[j]>queue[k]) w-@6|o,S
break; sE{pzPq!
SortUtil.swap(queue,j,k); kM`l
k = j; Z/rTVAs@r
} #yI.nzA*
} PR|R`.QSs
,#W
} 5<L_|d)0"
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} m5G\}8|
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SortUtil： $BmmNn#
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package org.rut.util.algorithm; &_5tqh
1c+]gIe
import org.rut.util.algorithm.support.BubbleSort; n41@iK2l
import org.rut.util.algorithm.support.HeapSort; wW?,;B'74
import org.rut.util.algorithm.support.ImprovedMergeSort; XBQ\_2>
import org.rut.util.algorithm.support.ImprovedQuickSort; #"fJa:IYG7
import org.rut.util.algorithm.support.InsertSort; ob_I]~^I?|
import org.rut.util.algorithm.support.MergeSort; /=uMk]h
import org.rut.util.algorithm.support.QuickSort; Vx_rc%'
import org.rut.util.algorithm.support.SelectionSort; f.GETw
import org.rut.util.algorithm.support.ShellSort; a{Esw`
;IK[Y{W/
/** Jx#k,Z4
* @author treeroot v+"rZ
* @since 2006-2-2 /J)l/oI
* @version 1.0 Jw~( G9G
*/ ``ekR6[8c
public class SortUtil { *Ywpz^2?:
public final static int INSERT = 1; T!W~n ZC
public final static int BUBBLE = 2; sS TPMh
public final static int SELECTION = 3; aAu>Tn86D.
public final static int SHELL = 4; -yDs< Xl
public final static int QUICK = 5; 9x+<Ik
public final static int IMPROVED_QUICK = 6; ZDL']*)'
public final static int MERGE = 7; U}Hwto`R
public final static int IMPROVED_MERGE = 8; ~"Gf<3^y+
public final static int HEAP = 9; d7Ur$K\=y
1xf=_F0`&
public static void sort(int[] data) { ,%bhyww<
sort(data, IMPROVED_QUICK); U=sh[W
} i~J;G#b
private static String[] name={ ?t@v&s
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" h;lirvO|
}; *b}>cn)<v
(yo;NKq,@
private static Sort[] impl=new Sort[]{ <ktzT&A
new InsertSort(), )x#5Il H
new BubbleSort(), ]<DNo&fw
new SelectionSort(), 9]$8MY
new ShellSort(), ,D6v4<jh
new QuickSort(), m\/(w_/?
new ImprovedQuickSort(), }G$]LWgQx
new MergeSort(), yz+, gLY
new ImprovedMergeSort(), ~#\i!I;RY}
new HeapSort() 6pE :A@
}; N^VD=<#T
/RLq>#:h**
public static String toString(int algorithm){ `nR%Cav,U
return name[algorithm-1]; =\)IaZ
} u!N{y,7W)
Q4s&E\}
public static void sort(int[] data, int algorithm) { O gmO&cE
impl[algorithm-1].sort(data); 8|twV35
} }wSi~^*
h!&sNzX
public static interface Sort { PU9`<3z5
public void sort(int[] data); <I;*[;AK
} U3vEdw<lV
[-*F"}D,
public static void swap(int[] data, int i, int j) { ~#:e*:ro
int temp = data; 'k&?DZ!
data = data[j]; 7dh1W@\
data[j] = temp; ~$O1`IT
} 09M;}4ev&7
} o7&4G$FX~