[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; 89x;~D1
} G8&/Ic
int i1=l; GH \ Sy
int i2=mid+1; 8n35lI( [
for(int cur=l;cur<=r;cur++){ zbI|3
if(i1==mid+1) H128T8?r[
data[cur]=temp[i2++]; m/3,;P.6
else if(i2>r) jG{OLF6 !
data[cur]=temp[i1++]; :DrF)1C
else if(temp[i1] data[cur]=temp[i1++]; ;0lY_ii
else 2ZEDyQM
data[cur]=temp[i2++]; wC?$P
} Xe&p.v
} L1Jn@
wjfq"7Q
} ~owodc
~dk97Z8
改进后的归并排序: {&J~P&,k
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package org.rut.util.algorithm.support; _F5*\tQ
>p'{!k
import org.rut.util.algorithm.SortUtil; z'7XGO'Lo
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/** 1m5*MY
* @author treeroot [+_>g4M~%
* @since 2006-2-2 BOWBD@y
* @version 1.0 c]n"1YNm
*/ >g m
public class ImprovedMergeSort implements SortUtil.Sort { *%Fu/
s94*uZ(C/
private static final int THRESHOLD = 10; S9{A}+"K
qtmKX
/* A'.=SA2.Y
* (non-Javadoc) Mo5b @ [
* `ZbFky{
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) G:3szz
*/ RD46@Q`
public void sort(int[] data) { 91]sO%3
int[] temp=new int[data.length]; NWP!V@WG
mergeSort(data,temp,0,data.length-1); VFzIBgJ3
} L^r & .N\
!JyY&D~`
private void mergeSort(int[] data, int[] temp, int l, int r) { #wo *2(
int i, j, k; E7M_R/7@y
int mid = (l + r) / 2; /M+Du,
if (l == r) Io|Du
return; !sSq4K
if ((mid - l) >= THRESHOLD) +<j7^AEG
mergeSort(data, temp, l, mid); U2l3E*O
else L SP p
insertSort(data, l, mid - l + 1); 5mC"8N1)
if ((r - mid) > THRESHOLD) ,2^4"gIl
mergeSort(data, temp, mid + 1, r); 'E+"N'M|
else [:FiA?O]
insertSort(data, mid + 1, r - mid); #c5jCy}n
B6Eu."T
for (i = l; i <= mid; i++) { 4(|yl^w
temp = data; ,zltNbu\.(
} -^5467
for (j = 1; j <= r - mid; j++) { __2<v?\
temp[r - j + 1] = data[j + mid]; Qr9;CVW
} dH!z<~
int a = temp[l]; T*f/M
int b = temp[r]; TI8r/P? ]V
for (i = l, j = r, k = l; k <= r; k++) { KWZhCS?[(
if (a < b) { PO`p.("h
data[k] = temp[i++]; }:Gs ,
a = temp; b:D92pH
} else { iN[x *A|h
data[k] = temp[j--]; !R"W2Z4h
b = temp[j]; 2S{P(B
} D]]wJQU2
} xwf-kwF8^
} %'yrIR
4P&2Z0
/** 80Dn!9j*
* @param data MQQm3VaKS
* @param l Lr:Qc#2
* @param i yGdX>h
*/ y%SxQA+\
private void insertSort(int[] data, int start, int len) { wQSye*ec
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); Zd6ik&S
} k*\Bl4g
} IT1YF.i
} AJbCC
} /ce;-3+
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堆排序： WVdV:vJ-
l1)~WqhE}
package org.rut.util.algorithm.support; U!aM63F3
vR!+ 8sy$
import org.rut.util.algorithm.SortUtil; @-'a{hBR
R}ki%i5|
/** "bm|p/A
* @author treeroot HIXAA?_eh=
* @since 2006-2-2 \8`7E1d
* @version 1.0 i6WH^IQM
*/ 2.D2 o
public class HeapSort implements SortUtil.Sort{ >A$L&8'C
_MBhwNBxZ
/* (non-Javadoc) >}+{;d
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) (/e&m=~
*/ J~m$7T3Af
public void sort(int[] data) { "do5@$p|
MaxHeap h=new MaxHeap(); ppyy0E^M
h.init(data); Vu:ZG*^
for(int i=0;i h.remove(); u>*a@3$f
System.arraycopy(h.queue,1,data,0,data.length); LwC?t3n
} cx\E40WD
;@wa\H[3v2
private static class MaxHeap{ V<QpC5
OS(`H5D
void init(int[] data){ AYAU
this.queue=new int[data.length+1]; O[ma% E*0
for(int i=0;i queue[++size]=data; f%]@e9dD
fixUp(size); -9b=-K.y
} \p4*Q}t
} X+4Uh I
N]P~`)
private int size=0; SZWNN#w60?
TO6F
private int[] queue; + -<8^y
G\sx'#Whc
public int get() { ynsYU(
return queue[1]; Z",0 $Gxu
} 5U2%X pO
56Wh<i3
public void remove() { 56pj(}eq
SortUtil.swap(queue,1,size--); L4po1
fixDown(1); 7ys' [G|}r
} OX;bA^+}P
file://fixdown fzJiW@-T
private void fixDown(int k) { *).
int j; +L09^I
while ((j = k << 1) <= size) { L1kn="5
if (j < size %26amp;%26amp; queue[j] j++; D[>:az`
if (queue[k]>queue[j]) file://不用交换 L'wR$
break; E2zL-ft.
SortUtil.swap(queue,j,k); q,[;AHb
k = j; RPX.?;":
} EZj rX>"#
} C^$E#|E9N
private void fixUp(int k) { iZ]^JPU}
while (k > 1) { "smU5 s,P
int j = k >> 1; \4 b^*`d
if (queue[j]>queue[k]) ^@x&n)nzP
break; *$cx7yJ
SortUtil.swap(queue,j,k); IR"C?
k = j; TFHYB9vV
} $}4ao2
} pauO_'j_1p
Da<`| l
} OsOfo({I_
3XY"s"
} O=K0KOj
z&9ljQ iF
SortUtil： TTO8tT3[6}
@CM5e!
package org.rut.util.algorithm; ?jmL4V2-f
GYtgw9 "Y
import org.rut.util.algorithm.support.BubbleSort; $JOtUB{
import org.rut.util.algorithm.support.HeapSort; qbc=kP
import org.rut.util.algorithm.support.ImprovedMergeSort; SOPair <r
import org.rut.util.algorithm.support.ImprovedQuickSort; y=Eb->a){
import org.rut.util.algorithm.support.InsertSort; [VX5r1-F
import org.rut.util.algorithm.support.MergeSort; ,OrrGwp&
import org.rut.util.algorithm.support.QuickSort; a,fcKe&B
import org.rut.util.algorithm.support.SelectionSort; xm=Gt$>.o
import org.rut.util.algorithm.support.ShellSort; +L=Xc^
pa^_D~
/** 0OlT^
* @author treeroot y ~-v0/
* @since 2006-2-2 IPTFx )]G
* @version 1.0 X6}W]
*/ `s69p'<;p
public class SortUtil { ^$`mS&3/q
public final static int INSERT = 1; tW!*W?
public final static int BUBBLE = 2; ,dd1/zm
public final static int SELECTION = 3; l_;6xkv4
public final static int SHELL = 4; K20Hh7cVJ
public final static int QUICK = 5; -~RGjx
public final static int IMPROVED_QUICK = 6; Ugo!
public final static int MERGE = 7; d %FLk=]
public final static int IMPROVED_MERGE = 8; Cj}H'k<B
public final static int HEAP = 9; 'pUJREb
!Mgo~h"]#
public static void sort(int[] data) { "3++S
sort(data, IMPROVED_QUICK); d=D#cs;\
} )zy;!
private static String[] name={ \ C$t
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" /]0SF_dZ
}; FzSL[S4i
o&M.9V?~~
private static Sort[] impl=new Sort[]{ {2Ew^Li
new InsertSort(), g9;s3qXiG
new BubbleSort(), ' -9=>
new SelectionSort(), qnQ".
new ShellSort(), o\><e1P
new QuickSort(), M/lC&F(
new ImprovedQuickSort(), y$di_)&g
new MergeSort(), v:Gy>&
new ImprovedMergeSort(), ~xDu2-5
new HeapSort() 9Nna-}e?W
}; C[jX;//Jiu
X!ldL|Ua%
public static String toString(int algorithm){ G; exH$y
return name[algorithm-1]; D vU1+y
} y<m[9FC}
3G<4rH]
public static void sort(int[] data, int algorithm) { ;; {K##^l
impl[algorithm-1].sort(data); q7_Ttjn-DV
} 0s{7=Ef
2A";oE
public static interface Sort { oclU)f.,
public void sort(int[] data); X@:Y./
} ,~1sZ`C
zkqn>
public static void swap(int[] data, int i, int j) { ?* ,
int temp = data; Q@PDhISa
data = data[j]; 3OKs?i3A
data[j] = temp; %,<Ki]F
} Nmt~1.J
} B/;'D7i|S