[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; ]b"Oy}ARW
} bZE;}d
int i1=l; t0 1@h_WS
int i2=mid+1; NT6OGBl&
for(int cur=l;cur<=r;cur++){ <GbF4\ue
if(i1==mid+1) S~9K'\vO
data[cur]=temp[i2++]; _qq> 43
else if(i2>r) CHeU?NtFps
data[cur]=temp[i1++]; Stkyz:,(
else if(temp[i1] data[cur]=temp[i1++]; ^}+qd1r
else iz&$q]P8
data[cur]=temp[i2++]; zF9SZ#{a
} 4'ym vR
} RpAqnDX)
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} X2? ^t]-N
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改进后的归并排序: mUmU_L u8
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package org.rut.util.algorithm.support; x +=zG4Hm
4;]<#u
import org.rut.util.algorithm.SortUtil; 1VlRdDg
ADTx _tE
/** /!l$Y?
* @author treeroot b?p<y`
* @since 2006-2-2 X0\2qD
* @version 1.0 -bN;nSgb
*/ OT*C7=
public class ImprovedMergeSort implements SortUtil.Sort { q`HuVilNH
_(K)(&
private static final int THRESHOLD = 10; Aj854 L(!
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/* </UUvMf"
* (non-Javadoc) f4JmY1)@
* ~6HpI0i
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) :2'y=t#
*/ )U?Tmh
public void sort(int[] data) { tl 0_Sd
int[] temp=new int[data.length]; WF)(Q~op0U
mergeSort(data,temp,0,data.length-1); G E=J Y
} I~'%
KW* 2'C&
private void mergeSort(int[] data, int[] temp, int l, int r) { {`FkiB` i
int i, j, k; SXYH#p
int mid = (l + r) / 2; yqEX0|V%
if (l == r) X"4:#s
return; B-oQ 9[~
if ((mid - l) >= THRESHOLD) rd*`8B
mergeSort(data, temp, l, mid); i++a^f
else $pV:)N4
insertSort(data, l, mid - l + 1); YP^=b}
if ((r - mid) > THRESHOLD) JHxy_<p/
mergeSort(data, temp, mid + 1, r); XX85]49`%
else BGtr=&Hq
insertSort(data, mid + 1, r - mid); B6N/nCvHK
n{d0}N=
for (i = l; i <= mid; i++) { E[:eMJR
temp = data; zTgY=fuz
} j20/Q)=h
for (j = 1; j <= r - mid; j++) { Lro[ |A
temp[r - j + 1] = data[j + mid]; |K|[>[?Z/
} $+ z3
int a = temp[l]; Q]JWWKt6rV
int b = temp[r]; aG"j9A~ &
for (i = l, j = r, k = l; k <= r; k++) { (i1JDe
if (a < b) { N~""Lc&
data[k] = temp[i++]; p?uk|C2
a = temp; ~4 ~c+^PF
} else { TY."?` [FK
data[k] = temp[j--]; 7L%JCH#F
b = temp[j]; Nl4,c[$C
} -0QoVGw
} b^*9m PP
} #?OJ9pyG'
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/** {8TLL@T4
* @param data iS p +~
* @param l R[C+?qux
* @param i Kyf,<zF
*/ e=>:(^CS
private void insertSort(int[] data, int start, int len) { 1@dB*Jt
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); #x?Ku\ts
} mY1I{'.
} x7<2K(
} .wU0F
} .tdaj6x
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堆排序： N)I9NM[
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package org.rut.util.algorithm.support; D*%?0
Q9yIQ{>H[
import org.rut.util.algorithm.SortUtil; 6`PQP;
Q#Tg)5.\
/** (#&-ld6
* @author treeroot $ Jz(Lb{
* @since 2006-2-2 ]C;X/8'Jf5
* @version 1.0 t@&U2JaL>W
*/ /5!0wxN
public class HeapSort implements SortUtil.Sort{ ag_*Z\
.+07 Ui]I!
/* (non-Javadoc) -JEiwi,
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) J~]Y
*/ |)+s,LT5
public void sort(int[] data) { tJM#/yT
MaxHeap h=new MaxHeap(); ){nOM$W
h.init(data); ^xyU*A}D
for(int i=0;i h.remove(); afw`Heaa2(
System.arraycopy(h.queue,1,data,0,data.length); rAn:hR{
} 7C&J88|\
V0l"tr@
private static class MaxHeap{ &KYPi'C9!z
Q$yMU[l)
void init(int[] data){ 5%_aN_1?ef
this.queue=new int[data.length+1]; 22T\-g{
for(int i=0;i queue[++size]=data; K8=jkU
fixUp(size); Sx0/Dm
} b8 ^O"oDrp
} }@y(-7t
{;L,|(o^
private int size=0; ^ Fnag]qQ
Ka_g3
private int[] queue; S4_C8
gkM Q=;Nn
public int get() { e7Sp?>-d
return queue[1]; "5!T-Z+F
} +a'LdEp
1KUM!DUD
public void remove() { V0<g$,W=
SortUtil.swap(queue,1,size--); j* ZU}Ss
fixDown(1); yPd6{% w
} 2dyS_2u
file://fixdown 5|jsv)M+
private void fixDown(int k) { -U{CWn3G
int j; = yFOH~_
while ((j = k << 1) <= size) { |iA8aHFU
if (j < size %26amp;%26amp; queue[j] j++; &7XsyDo6
if (queue[k]>queue[j]) file://不用交换 '5m4kDs
break; FNw0x6,~R
SortUtil.swap(queue,j,k); hh-a+] c0
k = j; #z1/VZ
} 5SMV3~*P
} k\TP3*fD
private void fixUp(int k) { yW)r`xpY
while (k > 1) { h"y~!NWn
int j = k >> 1; B1V+CP3t
if (queue[j]>queue[k]) I/*^s
break; SHYbQF2
SortUtil.swap(queue,j,k); LVNA`|>
k = j; a&Z,~Vp
} ]6 HR
} p9E/#U8A_
wVq9t|V
} {4$aA*
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} i-}Tt<^
n)j0h-
SortUtil： I 6'!b/
p/qu4[Mm
package org.rut.util.algorithm; P6I<M}p
(!PsK:wc
import org.rut.util.algorithm.support.BubbleSort; S"t\LB*'Ls
import org.rut.util.algorithm.support.HeapSort; ~dC.,"
import org.rut.util.algorithm.support.ImprovedMergeSort; z1^3~U$}
import org.rut.util.algorithm.support.ImprovedQuickSort; ([dwZ6$/J
import org.rut.util.algorithm.support.InsertSort; >V>`}TIH
import org.rut.util.algorithm.support.MergeSort; AQ?;UDqU
import org.rut.util.algorithm.support.QuickSort; t#VX#dJ
import org.rut.util.algorithm.support.SelectionSort; 5WA:gygB&
import org.rut.util.algorithm.support.ShellSort; /9A6"Z
5\EnD,y
/** R,s}<N$
* @author treeroot kTcW=AXu
* @since 2006-2-2 Qr_0 L
* @version 1.0 P}^Y"zF2
*/ =A*a9c2
public class SortUtil { !9{hbmF#
public final static int INSERT = 1; Qo!F?i/ n
public final static int BUBBLE = 2; w~q ]&
public final static int SELECTION = 3; g=KvCqJN
public final static int SHELL = 4; `fOp>S^Q4
public final static int QUICK = 5; {b'
public final static int IMPROVED_QUICK = 6; sYfm]Faz
public final static int MERGE = 7; )vUS).;S`
public final static int IMPROVED_MERGE = 8; |~ytAyw
public final static int HEAP = 9; dC;&X g`
ts% n tnvI
public static void sort(int[] data) { &Dt=[yqeG
sort(data, IMPROVED_QUICK); }Q*J!OH
} Uq @].3nf
private static String[] name={ !x:{"
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" OFBEJacy
}; }.pqV X{d
PhPe7^
private static Sort[] impl=new Sort[]{ %#o@c
new InsertSort(), <d"nz:e
new BubbleSort(), Fe %Vp/
new SelectionSort(), vcCNxIzEG
new ShellSort(), B9Mp3[
new QuickSort(), d>NO}MR
new ImprovedQuickSort(), d&AO4^
new MergeSort(), ^<Gxip
new ImprovedMergeSort(), A|4om=MO
new HeapSort() @lX%Fix9
}; #jzF6j%G
-LT!LBnEkf
public static String toString(int algorithm){ 8#HnV%|N
return name[algorithm-1]; HI{h>g T
} ~]#-S20
<Y6zJ#BD
public static void sort(int[] data, int algorithm) { MGq\\hLD\-
impl[algorithm-1].sort(data); ]R>NmjAI
} _BY+Tfol
4Y}Nu
public static interface Sort { IdMwpru(
public void sort(int[] data); *>"NUHq
} %6%mf>Guf
nW*cqM%+
public static void swap(int[] data, int i, int j) { $)$r
int temp = data; ^pH8'^n
data = data[j]; /qJCp![X
data[j] = temp; oc]:Ty
} Mtv{37k~
} H3*]}=