[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; *yaw$oB
} 8OFj0S1r`
int i1=l; lK(Fg
int i2=mid+1; Y`ihi,s`H
for(int cur=l;cur<=r;cur++){ M\oVA=d\0
if(i1==mid+1) q31>uF
data[cur]=temp[i2++]; )u} Q:`9
else if(i2>r) \ v2H^j/
data[cur]=temp[i1++]; k&6I f0i
else if(temp[i1] data[cur]=temp[i1++]; 93Yn`Av;
else B#l?IB~
data[cur]=temp[i2++]; !{UTD+|=N
} "&o,yd%
} _eQ-`?
dQ:cYNm
} ~^US/"
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改进后的归并排序: f@ `*>"
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package org.rut.util.algorithm.support; w4};q%OBj
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import org.rut.util.algorithm.SortUtil; >,5i60Q
X9=N%GY[
/** 1TN}GsAj
* @author treeroot %V_-%/3Z
* @since 2006-2-2 2W<n5o
* @version 1.0 7[#xOZT
*/ ERMa# L
public class ImprovedMergeSort implements SortUtil.Sort { kdrod[S
onei4c>@
private static final int THRESHOLD = 10; |Ul,6K@f"5
p<GR SJIk=
/* XEH}4;C'{
* (non-Javadoc) |zsbW9 W*m
* QfpuZEUK
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) nHOr AD|&
*/ [AzO:A
public void sort(int[] data) { S;\R!%t_
int[] temp=new int[data.length]; &)9{HRP
mergeSort(data,temp,0,data.length-1); /BA{O&Ro^
} :QQlI
YV'pVO'_+
private void mergeSort(int[] data, int[] temp, int l, int r) { _S?qDG{E|
int i, j, k; .K8w8X/3
int mid = (l + r) / 2; udk.zk
if (l == r) ,XKCz ]8V
return; IVvtX}
if ((mid - l) >= THRESHOLD) g}xQ6rd
mergeSort(data, temp, l, mid); ^q[gxuL_
else Rd&9E
insertSort(data, l, mid - l + 1); [:;# ]?
if ((r - mid) > THRESHOLD) Tbbz'b;{
mergeSort(data, temp, mid + 1, r); K >tf,
else *A}WP_ZQ
insertSort(data, mid + 1, r - mid); dbdM"z4
HM[klH]s=
for (i = l; i <= mid; i++) { S7iDTG_@t
temp = data; Kyg=$^{>G
} 3\$wdUFr
for (j = 1; j <= r - mid; j++) { K|S:{9Q
temp[r - j + 1] = data[j + mid]; 6cS>bl
} q?j|K|%
int a = temp[l]; <v 0*]NiX
int b = temp[r]; @I3eK^#|P
for (i = l, j = r, k = l; k <= r; k++) { |+,[``d>"
if (a < b) { \fWW'
data[k] = temp[i++]; ;^){|9@
a = temp; Q+q,!w8
} else { d3Di/Iej
data[k] = temp[j--]; m}j:nk
b = temp[j]; -~f511<
} *Ust[u
} T? ,P*l
} ;az5ZsvN D
yzsab ^]
/** k0z&v <
* @param data csZc|kDI
* @param l +_l^ #?o,
* @param i ;QCrHqRT`
*/ ?`_jFj+<\S
private void insertSort(int[] data, int start, int len) { dP2irC%f8
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); 5II(mSg8
} XMN:]!1J
} |J5 =J
} E ]9\R
} a`Qot
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堆排序： >JwLk[=j
{LzH&qu
package org.rut.util.algorithm.support; g| <wyt[
{svn=H /
import org.rut.util.algorithm.SortUtil; P(k(m<0
fl\aqtF
/** eW'2AT?2H%
* @author treeroot VhGs/5
* @since 2006-2-2 D('2p8;2"7
* @version 1.0 pv!oz2w1
*/ R8ONcG
public class HeapSort implements SortUtil.Sort{ Z#l%r0(o
3-n19[zk
/* (non-Javadoc) Z(>'0]G
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) {Rq1HH
*/ Q?t^@
public void sort(int[] data) { qm*}U3K
MaxHeap h=new MaxHeap(); N/QiI.V6
h.init(data); -D^A:}$
for(int i=0;i h.remove(); 3Ug
System.arraycopy(h.queue,1,data,0,data.length); qGmNz}4D5
} W=B"Q qL
s pLZ2]A
private static class MaxHeap{ cXMhq<GkAA
%h"z0@+
void init(int[] data){ DciwQcG
this.queue=new int[data.length+1]; nz1'?_5
for(int i=0;i queue[++size]=data; ^-CINt{O
fixUp(size); 8N%Bn&
} ^\:8w0Y^
} B\*@krI@
I:V0Xxz5t
private int size=0; 8x{B~_~
S\6[EQ65
private int[] queue; g$:Xuw1
@XD+'{]
public int get() { +|Hioq*,t
return queue[1]; V}o n|A
} j;_c+w!P
w6dFb6~R
public void remove() { %owsBO+
SortUtil.swap(queue,1,size--); x.0p%O=`
fixDown(1); 9mc!bj^811
} kPBV6+d~
file://fixdown ZlYPoOq
private void fixDown(int k) { gG%V 9eOQ
int j; S_T^G` [
while ((j = k << 1) <= size) { _sE#)@p
if (j < size %26amp;%26amp; queue[j] j++; K-<^$VWh
if (queue[k]>queue[j]) file://不用交换 LLWB
break; :f5s4N
SortUtil.swap(queue,j,k); d8SE,A&
k = j; oBq 49u1
} kL7#W9
} 0,s$T2
private void fixUp(int k) { 8E&XbqP+
while (k > 1) { a9zw)A
int j = k >> 1; &Lt[WT$
if (queue[j]>queue[k]) 9jp:k><\(c
break; WD;Y~|
SortUtil.swap(queue,j,k); b5IA"w
k = j; DcIvhBp
} =z?%;4'|
} 1CPjil*eb
o47r<>t
} rPc7(,o*
KV|}#<dD
} =Cv/Y%DN
;Zj]~|
SortUtil： h=kQ$`j6
biozZ
package org.rut.util.algorithm; 4`Nt{
8,O33qwH
import org.rut.util.algorithm.support.BubbleSort; >U1R.B7f
import org.rut.util.algorithm.support.HeapSort; q(5j(G ;
import org.rut.util.algorithm.support.ImprovedMergeSort; 7@.cOB`y@3
import org.rut.util.algorithm.support.ImprovedQuickSort; p\C%%
import org.rut.util.algorithm.support.InsertSort; Kx"<J@
import org.rut.util.algorithm.support.MergeSort; bW#@OrsS
import org.rut.util.algorithm.support.QuickSort; s{ V*1$e~
import org.rut.util.algorithm.support.SelectionSort; ;)Kh;;e
import org.rut.util.algorithm.support.ShellSort; o!Ev;'D
E6Rz@"^XV
/** ?::NO Dg
* @author treeroot jNwjK0?
* @since 2006-2-2 %puLr'Y
* @version 1.0 Md)zEj`\
*/ e@@?AB$n(
public class SortUtil { "I;C;}!
public final static int INSERT = 1; S1n3(U:m
public final static int BUBBLE = 2; J" j.'.
public final static int SELECTION = 3; d;Hn#2C
public final static int SHELL = 4; yix'rA-T
public final static int QUICK = 5; JO&JP3N1
public final static int IMPROVED_QUICK = 6; 0.r4f'vk
public final static int MERGE = 7; 3`O?16O
public final static int IMPROVED_MERGE = 8; s#h8%['
public final static int HEAP = 9; /wQL
}14{2=!Q
public static void sort(int[] data) { w.Ezg j
sort(data, IMPROVED_QUICK); NRnRMY-
} ~5ZvOX6L2
private static String[] name={ e73^#O&Xt
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" v]2S`ffP
}; |{g+Y
&m3.h!dq
private static Sort[] impl=new Sort[]{ ;;5Uwd'-
new InsertSort(), {P8[X@Lu
new BubbleSort(), QYXx:nIrg
new SelectionSort(), 8pM>Co!
new ShellSort(), j^`X~gE
new QuickSort(), <0|9Tn2O
new ImprovedQuickSort(), nU+tM~C%a
new MergeSort(), "%WgT2)m.
new ImprovedMergeSort(), C7T(+Wd!,
new HeapSort() "wH)mQnd
}; x+? 9C
ZWc+),X
public static String toString(int algorithm){ ?wMHS4
return name[algorithm-1]; hlvt$Jwq
} 3zuF{Q2P<
~:;3uLs,8
public static void sort(int[] data, int algorithm) { iMF<5fLH&
impl[algorithm-1].sort(data); y$Zj?Dd#
} I9$c F)zk
?tf&pgo
public static interface Sort { si1*Wt<3Bc
public void sort(int[] data); -9P2`XQ^
} \a"Ct'
P#kGX(G9!
public static void swap(int[] data, int i, int j) { 7k{2Upg;
int temp = data; ~CRSL1?
data = data[j]; ,lYaA5&I
data[j] = temp; Tm+;0
} Qx|H1_6
} bTmL5}n