[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; f]T#q@|lE
} IH}?CZ@{?
int i1=l; G!XizhE
int i2=mid+1; b=K
for(int cur=l;cur<=r;cur++){ -$dnUXFsj[
if(i1==mid+1) NkNw9?:#4
data[cur]=temp[i2++]; ofcoNLX5c
else if(i2>r) 9Hlu%R
data[cur]=temp[i1++]; hd/5*C{s
else if(temp[i1] data[cur]=temp[i1++]; 9p2"5x
else ,8+SQo#3
data[cur]=temp[i2++]; p8Lb*7W
} PovPO
} _)2NFq
wC@4`h\U
} -a&wOn-W
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改进后的归并排序: 2NIK0%6
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package org.rut.util.algorithm.support; saU|.\l
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import org.rut.util.algorithm.SortUtil; f+fF5Z\
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/** f[%\LHq
* @author treeroot P0' ;65
* @since 2006-2-2 KkJcHU
* @version 1.0 v SHb\V#
*/ &Vnet7LfU
public class ImprovedMergeSort implements SortUtil.Sort { @iC!Q>D
=!{}:An1$
private static final int THRESHOLD = 10; UupQ*,dJ
)c]GgPH
/* Gp@Y=mU
* (non-Javadoc) 8 l}tYl`|
* | 2p\M?@
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 8{%/!ylJz
*/ N7+K$)3
public void sort(int[] data) { akJ{-
int[] temp=new int[data.length]; mQVduG
mergeSort(data,temp,0,data.length-1); 1m}'Y@I
} F4kU) i
&rcr])jg[
private void mergeSort(int[] data, int[] temp, int l, int r) { d/P$qMD
int i, j, k; UO<uG#FB
int mid = (l + r) / 2; 0<!kGL5
if (l == r) s:I^AL5
return; -uy}]s5Qu
if ((mid - l) >= THRESHOLD) =*8"ci$
mergeSort(data, temp, l, mid); !QcgTW)T
else lSXhHy
insertSort(data, l, mid - l + 1); }! zjj\g^
if ((r - mid) > THRESHOLD) W!XFaA$
mergeSort(data, temp, mid + 1, r); d@,q6R}!MP
else z7HC6{g%X
insertSort(data, mid + 1, r - mid); 0e:KiUr
J +<|8D
for (i = l; i <= mid; i++) { $dorE~T
temp = data; rAP+nh ans
} N|1J@"H
for (j = 1; j <= r - mid; j++) { 78qf
temp[r - j + 1] = data[j + mid]; 1;.}u=8
} 0IQu6 X
int a = temp[l]; 5jx{O${u
int b = temp[r]; OK3B6T5w=
for (i = l, j = r, k = l; k <= r; k++) { wT*`Od8w
if (a < b) { K# _plpr
data[k] = temp[i++]; z_A%>E4
a = temp; WYEvW<Hv
} else { 3i35F.=X,
data[k] = temp[j--]; ^]E| >~\
b = temp[j]; /*rMveT
} FCqs'
} Pbm;@V
} Wd~}O<"
9FPl
/** Cv;z^8PZJz
* @param data `n5RDz/f0
* @param l z0g$+bhy
* @param i }@1LFZx
*/ ^Ud`2 OW;2
private void insertSort(int[] data, int start, int len) { tet
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); "TN}=^A\F
} 2R<1^
} 6D0uLh
} ',juZ[]_{
} g&_0)(a\
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堆排序： ~5p `Kg*
[}P|OCW
package org.rut.util.algorithm.support; EMs$~CL4
kIXLB!L2b^
import org.rut.util.algorithm.SortUtil; ;qG a|`#j
-VRu^l#
/** 3'1O}xO
* @author treeroot MKoN^(7
* @since 2006-2-2 ]6=cSs!
* @version 1.0 %[NefA(
*/ pjjs'A*y
public class HeapSort implements SortUtil.Sort{ e5veq!*C?
prIq9U|@
/* (non-Javadoc) /91H!s
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) &^&k]JBaV
*/ <@;eN&
public void sort(int[] data) { \?g)jY
MaxHeap h=new MaxHeap(); H26j]kY
h.init(data); x%cKTpDh!
for(int i=0;i h.remove(); %pTbJaM\U
System.arraycopy(h.queue,1,data,0,data.length); 4I{|M,+
} Eq'{uV:
gK#aC[
private static class MaxHeap{ dQ;rO$co
3 5|5|ma
void init(int[] data){ *dUnP{6g
this.queue=new int[data.length+1]; DrMcE31
for(int i=0;i queue[++size]=data; Nm\I_wjX
fixUp(size); }=XL^a|V
} }o)GBWqHR
} (qohb0
#n~/~*:i92
private int size=0; "#[Y[t\Ia
x`C;
private int[] queue; k`\DC\0RG
CgEeO,N]j
public int get() { 7p u*/W~
return queue[1]; tk1qgjE(?
} +twBFhS7k
?+`Zef.g
public void remove() { 3z~zcQ^\
SortUtil.swap(queue,1,size--); hr]NW>;
fixDown(1); 1iF |t5>e
} WGp81DNS|
file://fixdown 0m*0I>
private void fixDown(int k) { *pI3"_
int j; 2"V?+Hhz
while ((j = k << 1) <= size) { $9Z8P_^.0(
if (j < size %26amp;%26amp; queue[j] j++; eDTEy;^o
if (queue[k]>queue[j]) file://不用交换 eZP"M6
break; EkXns%][L
SortUtil.swap(queue,j,k); AQ+w%>G6
k = j; QdDdrR^&
} 8iX?4qj{P
} N15{7,
private void fixUp(int k) { 1s!hl{n<~
while (k > 1) { H6'xXS
int j = k >> 1; w="I*7c@
if (queue[j]>queue[k]) n%"s_W'E
break; z KJ6j]m
SortUtil.swap(queue,j,k); rBgLj,/`U/
k = j; ;O{AYF?,N
} .bnoK
} CXA)Zl5#
fyQAQZT
} UN,@K9
!7 *X{D v
} 4fpz;2%
B.&q]CAv-
SortUtil： z,DEBRT+
0>E`9|
package org.rut.util.algorithm; _CI!7%
v\\Z[,dK
import org.rut.util.algorithm.support.BubbleSort; 9LCV"xgX
import org.rut.util.algorithm.support.HeapSort; 6aMqU?-
import org.rut.util.algorithm.support.ImprovedMergeSort; U_M> Q_r(
import org.rut.util.algorithm.support.ImprovedQuickSort; $C^94$W
import org.rut.util.algorithm.support.InsertSort; S=M$g#X`5
import org.rut.util.algorithm.support.MergeSort; JNX7]j\
import org.rut.util.algorithm.support.QuickSort; "v^Q !
import org.rut.util.algorithm.support.SelectionSort; 8 kd
import org.rut.util.algorithm.support.ShellSort; (h`||48d
!;iySRZr
/** \>9%=32u.
* @author treeroot K*CO%:,-
* @since 2006-2-2 % YU(,83(+
* @version 1.0 EJZl'CR
*/ e ~*qi&,4
public class SortUtil { VN`2bp>5I
public final static int INSERT = 1; SjG=H%
public final static int BUBBLE = 2; {\lu; b!
public final static int SELECTION = 3; O`|'2x{[O
public final static int SHELL = 4; &XgB-}^:
public final static int QUICK = 5; ,{:5Z:<|
public final static int IMPROVED_QUICK = 6; Fwho.R-.
public final static int MERGE = 7; -Z6ot{%
public final static int IMPROVED_MERGE = 8; ^*}L9Ot~
public final static int HEAP = 9; M^+~r,D1u
= #ocp
public static void sort(int[] data) { 8 +uOYNXsA
sort(data, IMPROVED_QUICK); *^" 4 )
} fn;7Nf7{
private static String[] name={ *"1]NAz+
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" c%i/ '<Afr
}; 2r[Q$GPM<
LFg<j1Gk`
private static Sort[] impl=new Sort[]{ bl}$x/
new InsertSort(), ~?[@KK
new BubbleSort(), F(@|p]3*
new SelectionSort(), p,ZubRJ"
new ShellSort(), wf8vKl#Kfw
new QuickSort(), -+ $u
new ImprovedQuickSort(), w 7=Y_
new MergeSort(), 37M7bB0
new ImprovedMergeSort(), JJ7-$h'0q
new HeapSort() QD /| zi
}; Y@#~8\_
eMWY[f3
public static String toString(int algorithm){ n;O 3.2
return name[algorithm-1]; DB%=/ \U
} 3(vI{[yhT
4*m\Zoq>
public static void sort(int[] data, int algorithm) { ##R]$-<4dQ
impl[algorithm-1].sort(data); G^ n|9)CVW
} "o[\Aec:
.;*0odxv
public static interface Sort { i,* DWD+
public void sort(int[] data); > -k$:[l
} \ m2[
97$y,a{6
public static void swap(int[] data, int i, int j) { ^B]M- XG
int temp = data; F"a,[i,[W
data = data[j]; 1a#wUd3
data[j] = temp; zPhNV8k-
} zif()i
} Wq"pKI#x