[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; ;k9s@e#a
} I'`Q_5s5
int i1=l; sc@v\J;k
int i2=mid+1; cW/RH.N
for(int cur=l;cur<=r;cur++){ "o*F$7D!
if(i1==mid+1) ME>OTs
data[cur]=temp[i2++]; z%}^9
else if(i2>r) 3R !Mfz*
data[cur]=temp[i1++]; 7;dV]N
else if(temp[i1] data[cur]=temp[i1++]; ([qw#!;w;
else B;SYO>.W
data[cur]=temp[i2++]; 2w$o;zz1
} 9} :n
} A%Pjg1(uX
Zh)Qq?H
} 0vqXLFf
+w?RW^:Q=
改进后的归并排序: 1,p7Sl^h
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package org.rut.util.algorithm.support; u `1cXL['
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import org.rut.util.algorithm.SortUtil; g7EJyA
_bHmcK
/** 5)wz`OS
* @author treeroot &y[Od{=
* @since 2006-2-2 1 xm8w$%
* @version 1.0 qSlC@@.>
*/ 21O!CvX
public class ImprovedMergeSort implements SortUtil.Sort { 6wYd)MDLL
7{ (t_N>
private static final int THRESHOLD = 10; C&^"]-t
<{Wsh#7}.
/* X2 c<.
* (non-Javadoc) +H,/W_/g
* Du k v[/60
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) >)YaWcI
*/ gI~Ru8
public void sort(int[] data) { 6D_3Hwrs
int[] temp=new int[data.length]; z4D[>2*
mergeSort(data,temp,0,data.length-1); '2vZ%C$
} qgbp-A!2zF
Wf^6:
private void mergeSort(int[] data, int[] temp, int l, int r) { IP~*_R"bM
int i, j, k; ^vS+xq|4"
int mid = (l + r) / 2; 9+)5#!0
if (l == r) ]R~K-cN`
return; /~yk
if ((mid - l) >= THRESHOLD) nsQx\Tnhx
mergeSort(data, temp, l, mid); ]mYT!(}
else y#!8S{
insertSort(data, l, mid - l + 1); &x =}m
if ((r - mid) > THRESHOLD) ;HtHN K(o
mergeSort(data, temp, mid + 1, r); sPuNwVX>}I
else "q5Tw+KCfu
insertSort(data, mid + 1, r - mid); #]>Z4=]v
i1v0J->
for (i = l; i <= mid; i++) { FGo{6'K(:
temp = data; FO#`}? R`
} <)ozbv Xk
for (j = 1; j <= r - mid; j++) { DUUQz:?{J
temp[r - j + 1] = data[j + mid]; u;R<
} bq#*XCt#
int a = temp[l]; ^vPM\qP#g
int b = temp[r]; #q'J`BC
for (i = l, j = r, k = l; k <= r; k++) { \_;zm+ <{
if (a < b) { :_E=&4&g
data[k] = temp[i++]; \yP\@cpY{
a = temp; V+j58Wuf
} else { 4+qoq$F</
data[k] = temp[j--]; eT* )r~
b = temp[j]; kXK D>."E*
} 7~n<%q/6
} W'WZ@!!
} f}Mx\dc
{,61V;Bpm
/** ;/T=ctIs
* @param data nA$zp
* @param l Gxx:<`[ON
* @param i @k~'b
*/ V`Ve__5;
private void insertSort(int[] data, int start, int len) { s @\UZC
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); WfYu-TK*
} S?TyC";!
} fR[kjwX)<1
} qXC>DGy
} hZ6CiEJB
F} d>pK9fn
堆排序： =s3f{0G
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package org.rut.util.algorithm.support; 0RmQfD>
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import org.rut.util.algorithm.SortUtil; sswYwU
X;`XkOjk
/** \0. c_
* @author treeroot IjJO;
* @since 2006-2-2 t*X k'(v
* @version 1.0 (prqo1e@
*/ t0t" =(d
public class HeapSort implements SortUtil.Sort{ U8Rko)
ZmM/YPy
/* (non-Javadoc) <*I%U]
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 5k/Y7+*?E
*/ l!UF`C0g
public void sort(int[] data) { %C}TdG(C
MaxHeap h=new MaxHeap(); 8&T6
h.init(data); Z1u:OI@(
for(int i=0;i h.remove(); yn&+ >{
System.arraycopy(h.queue,1,data,0,data.length); Y [8~M8QX
} zl~`>
lI#Ap2@
private static class MaxHeap{ Cbw@:+%J{
dG5p`N%
void init(int[] data){ ~%)ug3%e
this.queue=new int[data.length+1]; ibe#Y
for(int i=0;i queue[++size]=data; GZt+(q
fixUp(size); eAvOT$
} )8ub1,C
} .v<Q-P\8/
Qv~KGd9
private int size=0; ^Yu<fFn
A}K2"lQ#>,
private int[] queue; ZV:cgv
!cblmF;0
public int get() { jV:Krk6T<
return queue[1]; ~o"VZp
} j2\B(PA
u7L!&/6On
public void remove() { 'x'.[=;
SortUtil.swap(queue,1,size--); qHM,#W<
fixDown(1); ){'Ef_/R
} UvR F\x%
file://fixdown POZ5W)F(
private void fixDown(int k) { G.ag$KF
int j; vR;?~^{*s
while ((j = k << 1) <= size) { LI`L!6^l
if (j < size %26amp;%26amp; queue[j] j++; ~96fyk|
if (queue[k]>queue[j]) file://不用交换 $?voQ&
break; d46PAA{'
SortUtil.swap(queue,j,k); R<"fcsU
k = j; Q7<_>)e^
} (+M]C]
} -1~-uE.~4d
private void fixUp(int k) { ~3,>TV
while (k > 1) { km%c0:
int j = k >> 1; P~"e=NL5
if (queue[j]>queue[k]) k)'y;{IN
break; x:Mh&dq?
SortUtil.swap(queue,j,k); -eZ$wn![
k = j; pb>TUKvT&
} (4;m*'X
} }(*eRF'
+0{$J\s
} 0[\^Y<ec
wNNInS6
} 6a_MA*XK
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SortUtil： ]6:|-x:m
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package org.rut.util.algorithm; J(0E'o{ug
> T$M0&<
import org.rut.util.algorithm.support.BubbleSort; *wvd[q h
import org.rut.util.algorithm.support.HeapSort; mNc?`G_R
import org.rut.util.algorithm.support.ImprovedMergeSort; #pe#(xoI
import org.rut.util.algorithm.support.ImprovedQuickSort; bSG}I|
import org.rut.util.algorithm.support.InsertSort; o7_*#5rD
import org.rut.util.algorithm.support.MergeSort; G)(vd0X1
import org.rut.util.algorithm.support.QuickSort; ~2HlAU))<&
import org.rut.util.algorithm.support.SelectionSort; \3WF-!xe
import org.rut.util.algorithm.support.ShellSort; ,b b/ $
d*}dM"
/** vS@;D7ep
* @author treeroot <l#|I'hP
* @since 2006-2-2 [osIQ!u;:
* @version 1.0 ?h$ =]
*/ t\GoUeH]
public class SortUtil { +n'-%?LD&
public final static int INSERT = 1; PU& v{gn
public final static int BUBBLE = 2; sxP1.= W
public final static int SELECTION = 3; h?8I`Z)h
public final static int SHELL = 4; nfj8z@!
public final static int QUICK = 5; ,$H[DX
public final static int IMPROVED_QUICK = 6; ryC7O'j_P
public final static int MERGE = 7; 88]4GVi
public final static int IMPROVED_MERGE = 8; ?KB+2]7m6
public final static int HEAP = 9; B_kjy=]O.
B'AU~#d
public static void sort(int[] data) { =x &"aF1
sort(data, IMPROVED_QUICK); 6d# 7
} c[E"
private static String[] name={ C>MEgGP
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" uV|%idC
}; '5f6 M^}|2
*v}3So
private static Sort[] impl=new Sort[]{ ],W/IDv
new InsertSort(), z1AYXW6F
new BubbleSort(), u&E$(
new SelectionSort(), ]ChGi[B~9
new ShellSort(), [& d"Z2gK
new QuickSort(), 2F z;TNS
new ImprovedQuickSort(), lihV!1
new MergeSort(), ?=},%^
new ImprovedMergeSort(), mw!EDJ;'
new HeapSort() ##\ <mFE
}; SjmWlf,
.='hYe.
public static String toString(int algorithm){ K(: _52rt
return name[algorithm-1]; o-}q|tD$<
} 9kO}054
I'%\ E,
public static void sort(int[] data, int algorithm) { fZ6-ap,u
impl[algorithm-1].sort(data); !vY5X2?tr,
} 5ns.||%k
{0~xv@ U
public static interface Sort { K^yZfpa8
public void sort(int[] data); 9aacW
} {L#+v~d^'n
d1{%z\u a
public static void swap(int[] data, int i, int j) { Y+ Qm.
int temp = data; .1q4Q\B<
data = data[j]; Z37%jdr
data[j] = temp; QqdVN3#1z
} .B?J@,
} 0kiV-yc