[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; WGN[`D"
} LeO ))
int i1=l; Qc;`nck
int i2=mid+1; WLiY:X(+|
for(int cur=l;cur<=r;cur++){ 1,`-n5@J%n
if(i1==mid+1) rtvuAFiH
data[cur]=temp[i2++]; SW(7!`
else if(i2>r) {.bLh0
data[cur]=temp[i1++]; aQCbRS6
else if(temp[i1] data[cur]=temp[i1++]; vY *p][$
else r=n|MT^O
data[cur]=temp[i2++]; :>nk63V (
} ioi0^aM
} VxjEKc
Fly@"W4a
} '&Q_5\Tn
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改进后的归并排序: _Jk-nZgn
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package org.rut.util.algorithm.support; FRF3V>
)~_!u}+:(
import org.rut.util.algorithm.SortUtil; WEqHL,Uh]
$qD8vu )|j
/** q?[{fcNh$
* @author treeroot KD$P\(5#
* @since 2006-2-2 b;]'Bo0K
* @version 1.0 %83PbH
*/ Vyj>&"28
public class ImprovedMergeSort implements SortUtil.Sort { 1]A%lud4
6NbIT[LvT
private static final int THRESHOLD = 10; *D~@xypy
Id]WKL:
/* 4en&EWUr
* (non-Javadoc) uQ&&?j
* -}{\C]%
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) h?.6e9Y4
*/ 86/CA[Y-
public void sort(int[] data) { [aO"9
int[] temp=new int[data.length]; b6bmvHD
mergeSort(data,temp,0,data.length-1); Mki(,Y|1~
} cy)L%`(7
;&WN%L*
private void mergeSort(int[] data, int[] temp, int l, int r) { V?Lf&X?
int i, j, k; q]<Xx{_
int mid = (l + r) / 2; ~Az20RrK)
if (l == r) ETH`.~%
return; j!mI9*hP
if ((mid - l) >= THRESHOLD) aP8Im1<A
mergeSort(data, temp, l, mid); )7q;Fm_/
else =zVbZ7
insertSort(data, l, mid - l + 1); 1kio.9NIp
if ((r - mid) > THRESHOLD) 1dfA 8=L,s
mergeSort(data, temp, mid + 1, r); '0H+2
else 5ez"B]&T
insertSort(data, mid + 1, r - mid); 5zpk6FR$
mt fDl;/D
for (i = l; i <= mid; i++) { 2s-f?WetbP
temp = data; i= ~HXr}
} jA=uK6m
for (j = 1; j <= r - mid; j++) { GuM-H$,
temp[r - j + 1] = data[j + mid]; XS9k&~)*
} gD=s~DgN)
int a = temp[l]; bT[Q:#GL
int b = temp[r]; @)<uQ S
for (i = l, j = r, k = l; k <= r; k++) { %E1~I\n:F
if (a < b) { ?j8CkqX!
data[k] = temp[i++]; 'QeqWn
a = temp; 5y=X?hF~)
} else { iA^w2K
data[k] = temp[j--]; A6lf-8ncx
b = temp[j]; GaRL]w
} 6 Y&OG>_\
} 'AeU
} n9bX[+#d
ji A$6dZU
/** 3WPMS/
* @param data F`Q,pBl1p6
* @param l b ";#qVv C
* @param i 8C,?Ai<ro
*/ "kP.Kx!
private void insertSort(int[] data, int start, int len) { L2{tof
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); @#VxjXW^
} M*t@Q|$:
} E'XFn'
} e{=7,DRH<
} RF6(n8["MW
J'@I!Jc
堆排序： ^Xa-)Pu
9!2KpuWji
package org.rut.util.algorithm.support; U%gP2]t%cs
y::KjB 0
import org.rut.util.algorithm.SortUtil; %=#&\ldPS
*>_:E6)
/** O(&EnNm[2
* @author treeroot EHzU`('?[
* @since 2006-2-2 uAVV4)
* @version 1.0 F{l,Tl"Jw
*/ ~p'/Z@Atu
public class HeapSort implements SortUtil.Sort{ 'QCvN b6
~JC``&6E=}
/* (non-Javadoc) y9W*/H{[`
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ik&loM_
*/ ,Oxdqxu7
public void sort(int[] data) { @Z3b^G[
MaxHeap h=new MaxHeap(); 6K`frt
h.init(data); 7acAU{Rr
for(int i=0;i h.remove(); ,wX/cUyZ
System.arraycopy(h.queue,1,data,0,data.length); .WyI.Y1
} HD=WHT&
O,^,G<`
private static class MaxHeap{ >IoOCQQ*
!m_'<=)B4~
void init(int[] data){ zw5EaY
this.queue=new int[data.length+1]; q#OLb"bTr
for(int i=0;i queue[++size]=data; ).v;~yE
fixUp(size); OEB_LI'
} {\]SvoJnJ
} mT!~;]RrF
diTzolY7
private int size=0; sGdt)
_9L2JN$R6
private int[] queue; :&_@U$
b?w4Nx#
public int get() { {_k 6t
return queue[1]; {tWfLfzU
} /eIwv31
l l&iMj]
public void remove() { WU=Os8gR
SortUtil.swap(queue,1,size--); h!d#=.R
fixDown(1); _e`b^_
} bE0S)b)
file://fixdown DCwldkdJN
private void fixDown(int k) { VaX>tUW
int j; c?IIaj!
while ((j = k << 1) <= size) { c!kbHZ<Z
if (j < size %26amp;%26amp; queue[j] j++; i~K~Czmok+
if (queue[k]>queue[j]) file://不用交换 X_%78$N-a`
break; #lJF$
SortUtil.swap(queue,j,k); P_b00",S
k = j; g1&GX(4[
} w5~<jw%>
} (q +Q.Q
private void fixUp(int k) { Qz<v. _
while (k > 1) { ENqJ9%sk7
int j = k >> 1; f3yZx!K_Br
if (queue[j]>queue[k]) {{2ZWK 6|
break; r/{0YFa
SortUtil.swap(queue,j,k); t$Qav>D
k = j; i ;X'1TN(y
} ,j5fzA
} hKX-]+6"
D}3E1`)W
} }r,k*I'K
u!g<y
} VK$+Nm)
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SortUtil： i(U*<1y
rRsLl/d
package org.rut.util.algorithm; u_:" u
0Q>Yoa 11
import org.rut.util.algorithm.support.BubbleSort; hV=)T^Q
import org.rut.util.algorithm.support.HeapSort; :k(aH Ua
import org.rut.util.algorithm.support.ImprovedMergeSort; $9hOWti
import org.rut.util.algorithm.support.ImprovedQuickSort; T[<9Ty'^
import org.rut.util.algorithm.support.InsertSort; "G4{;!0C
import org.rut.util.algorithm.support.MergeSort; 1h)I&T"kZ
import org.rut.util.algorithm.support.QuickSort; ,Zs-<e"
import org.rut.util.algorithm.support.SelectionSort; :[AW
import org.rut.util.algorithm.support.ShellSort; C:P,q6
\ u5%+GA-:
/** }1(F~6RH
* @author treeroot L\n_q6n
* @since 2006-2-2 6.K)uQgjmv
* @version 1.0 vk[Km[(U'
*/ 1}V_:~7
public class SortUtil { #]:nQ(
public final static int INSERT = 1; 4'X^YBm
public final static int BUBBLE = 2; fmloh1{4
public final static int SELECTION = 3; }|A%2!Q}
public final static int SHELL = 4; _jnH!Mw
public final static int QUICK = 5; zeR!Y yt!
public final static int IMPROVED_QUICK = 6; w/Q'T&>b/
public final static int MERGE = 7; gy*N)iv%
public final static int IMPROVED_MERGE = 8; ((t8
public final static int HEAP = 9; t@!oc"z}@
{){i ONd
public static void sort(int[] data) { 8[zP2L!-
sort(data, IMPROVED_QUICK); ]1p&*xX:Bj
} }hl# e[$
private static String[] name={ !@*Ac$J>$
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" wAy;ZNu
}; >gVR5o
nP_s+k
private static Sort[] impl=new Sort[]{ )8e_<^M
new InsertSort(), 8 Z#)Xb4
new BubbleSort(), WU}JArX9
new SelectionSort(), 2Uk$9s
new ShellSort(), mtJI#P
new QuickSort(), \Dr@n^hk@[
new ImprovedQuickSort(), lfWxdi
new MergeSort(), *[_?4*F
new ImprovedMergeSort(), i<&2Ffvq
new HeapSort() v( (fRX.`
}; *4+;Ey
BU])@~$
public static String toString(int algorithm){ YFsEuaV
return name[algorithm-1]; m: w/[|_
} +KD~/}C%-
#PtV=Ee1
public static void sort(int[] data, int algorithm) { Pk*EnA)
impl[algorithm-1].sort(data); zf2]|]*xz
} \.Q"fd?a_D
a"hlPJlG
public static interface Sort { 2:2rwH }e
public void sort(int[] data); ;XGG&M%3
} Y_f6y9?ZE
yjN|PqtSV
public static void swap(int[] data, int i, int j) { >mh:OJH45
int temp = data; T`f9jD
data = data[j]; 7eh}Je8
data[j] = temp; AA yzT*^
} UyIjM;X
} JNk ]$ xz