[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; y"SVZ} ;|
} h"G#} C]
int i1=l; u($y<Q)=
int i2=mid+1; hpJi,4r.d
for(int cur=l;cur<=r;cur++){ YTpO4bX
if(i1==mid+1) R nf$
data[cur]=temp[i2++]; E7qk>~Dg
else if(i2>r) qTL]
data[cur]=temp[i1++]; miZ&9m
else if(temp[i1] data[cur]=temp[i1++]; &iDX+*(
else 9n"D/NZB
data[cur]=temp[i2++]; thjCfP
} *L.+w-g&&
} <M|kOi
ca1A9fvo
} AA$-Lx(UJk
dRXF5Ox5K}
改进后的归并排序: &8 ~+^P1w
o4CgtqRs
package org.rut.util.algorithm.support; |,89zTk'
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import org.rut.util.algorithm.SortUtil; s`G3SE
KfsURTZ
/** Ojf.D6nY
* @author treeroot ^?H3:CS
* @since 2006-2-2 |%R}!O<.c
* @version 1.0 i`R}IP?71
*/ 7"`%-a$7
public class ImprovedMergeSort implements SortUtil.Sort { Jiljf2h
-*u7MFq_
private static final int THRESHOLD = 10; /=}w%-;/;
b*xw=G3%
/* /}\EMP
* (non-Javadoc) 0a??8?Q1G
* Q9b.]W
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) E1'HdOh&z
*/ gSP]& _9j
public void sort(int[] data) { J]A!>|Ic
int[] temp=new int[data.length]; -Fe))Y'=
mergeSort(data,temp,0,data.length-1); $Aw"?&d"
} 2WRa@;Tj
p] V
private void mergeSort(int[] data, int[] temp, int l, int r) { [Az<E3H"
int i, j, k; XP"lqyAi
int mid = (l + r) / 2; l* =\0
if (l == r) i[_WO2
return; C$~2FTx
if ((mid - l) >= THRESHOLD) >'^Tp7\
mergeSort(data, temp, l, mid); Uv~r]P)
else V(|@6ww
insertSort(data, l, mid - l + 1); ^-9g_5
if ((r - mid) > THRESHOLD) lU0'5!3R,
mergeSort(data, temp, mid + 1, r); +wU9d8W
else Ccld;c&+
insertSort(data, mid + 1, r - mid); ndn)}Z!0h
.|Pq!uLvc
for (i = l; i <= mid; i++) { ^#T@NN0T
temp = data; ?H\K];
} @-9I<)Z/2
for (j = 1; j <= r - mid; j++) { JgJ4RmH-
temp[r - j + 1] = data[j + mid]; 'a`cK;X9F
} YQWGv,47\
int a = temp[l]; )A}u)PH4O
int b = temp[r]; 9gFema{U
for (i = l, j = r, k = l; k <= r; k++) { &>zzR$#1
if (a < b) { K]{Y >w
data[k] = temp[i++]; iX]Vkx
a = temp; A~_*vcz
} else { "&s9;_9
data[k] = temp[j--]; nCZ&FNi{O~
b = temp[j]; EIqe|a+
} ]Z?y\L*M-
} X!,2/WT
} roDE?7x1
#d,+87]\=
/** ,iKL 68
* @param data ]o18oY(
* @param l LD]a!eY
* @param i slC 38
*/ 038|>l-9[
private void insertSort(int[] data, int start, int len) { /gWaxR*m
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); 6;WfsG5
} B|9)4f&\=R
} KTr7z^
} ?/Bp8q(
} N8!V%i?
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堆排序： cI~uI'
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package org.rut.util.algorithm.support; %~eIx=s
TUw+A6u:p
import org.rut.util.algorithm.SortUtil; {O ]^8#v^
WrB:)Q(8=
/** iI|mFc|V
* @author treeroot @]v}&j7
* @since 2006-2-2 (gY3?&Ok*
* @version 1.0 .E H&GX
*/ 3 q1LIM
public class HeapSort implements SortUtil.Sort{ 6'YT3=
cR'l\iv+
/* (non-Javadoc) u^HC1r|%
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ^U"$uJz!c
*/ #NU@7Q[4
public void sort(int[] data) { P%VEJ5,]b
MaxHeap h=new MaxHeap(); zl?Gd4
h.init(data); hk6(y?#
for(int i=0;i h.remove(); 6#[
System.arraycopy(h.queue,1,data,0,data.length); ]S@zhQ
} RLy(Wz3%
-|0nZ
private static class MaxHeap{ vO>Fj
7+_TdDBYs
void init(int[] data){ }q<p;4<\F
this.queue=new int[data.length+1]; muh[wo
for(int i=0;i queue[++size]=data; =<yMB d\
fixUp(size); ~s3X&!#
} BlwAD
} +,7nsWV
yx0wR
private int size=0; PIk2mX/D_6
in-|",O`Z
private int[] queue; WP*xu-(:
/\L-y,>X
public int get() { 6pJFrWe{
return queue[1]; JXFPN|
} >A5*=@7bY?
0R2KI,WI
public void remove() { `_YXU
SortUtil.swap(queue,1,size--); srzlr-J
fixDown(1); B*0TM+
} Y-yozt
file://fixdown #mT\B[4h
private void fixDown(int k) { .r ,wc*SF
int j; N>pTl$\4
while ((j = k << 1) <= size) { 2VpKG*!\
if (j < size %26amp;%26amp; queue[j] j++; W&g@o@wa
if (queue[k]>queue[j]) file://不用交换 bVLBqa=
break; Dq07Z^#'
SortUtil.swap(queue,j,k); F,dPmR
k = j; h^QLvOuR
} 6zyxGJ(
} ]A?(OA
private void fixUp(int k) { o,r72>|
while (k > 1) { ?04jkq&
int j = k >> 1; +56N}MAs
if (queue[j]>queue[k]) -!@]z2uU
break; p!oO}gE
SortUtil.swap(queue,j,k); 0P_=Oy"l-
k = j; /penB[1i
} NL^;C3u
} kAV4V;ydh
53X i)
} u~O9"-m !V
;AH8/M B9
} X%C`('"R
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SortUtil： CMhl*dH
6o:b(v&Oo
package org.rut.util.algorithm; MnLo{G]
*x!j:/S`n
import org.rut.util.algorithm.support.BubbleSort; B~?R 6
import org.rut.util.algorithm.support.HeapSort; h5)4Z^n
import org.rut.util.algorithm.support.ImprovedMergeSort; H*.v*ro9_
import org.rut.util.algorithm.support.ImprovedQuickSort; K#%@4]jO3
import org.rut.util.algorithm.support.InsertSort; C.|.0^5
import org.rut.util.algorithm.support.MergeSort; q1^bH6*fl
import org.rut.util.algorithm.support.QuickSort; ;S_Imf0$v
import org.rut.util.algorithm.support.SelectionSort; iv!;gMco
import org.rut.util.algorithm.support.ShellSort; Wq2Bo*[*
~|Nj+A
/** 2%?Kc]JY9
* @author treeroot $x~U&a
* @since 2006-2-2 gB_gjn\
* @version 1.0 R+*-i+]Q#7
*/ R@df~
public class SortUtil { uv|RpIve:
public final static int INSERT = 1; sB@9L L]&|
public final static int BUBBLE = 2; W-RqooEv
public final static int SELECTION = 3; lRANXM
public final static int SHELL = 4; /Moyn"Kj{
public final static int QUICK = 5; 6:Hd`
public final static int IMPROVED_QUICK = 6; %zKTrsMZ
public final static int MERGE = 7; +xL' LCx
public final static int IMPROVED_MERGE = 8; u<U8LR=)V5
public final static int HEAP = 9; Mdw"^x$7
~hxW3e
public static void sort(int[] data) { YB+My~fw{l
sort(data, IMPROVED_QUICK); 2!)|B ;y
} g#iRkz%l)&
private static String[] name={ RRb>]oD
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" H73 r3BH
}; Pk3b#$+E
^/ff)'.J
private static Sort[] impl=new Sort[]{ 5E#8F
new InsertSort(), fKbg?
new BubbleSort(), j6d{r\!$4
new SelectionSort(), *snY|hF
new ShellSort(), %$<v:eMAs
new QuickSort(), r0Zj'F_e
new ImprovedQuickSort(), C14"lB.
new MergeSort(), 3o2x&v
new ImprovedMergeSort(), kmg/hNtN
new HeapSort() *kt|CXxAS8
}; *qA:%m3
<lZVEg
public static String toString(int algorithm){ s7(1|}jh
return name[algorithm-1]; v=_Ds<6n
} en"\2+{Cg
}U^iVq*
public static void sort(int[] data, int algorithm) { e>UU/Ks
impl[algorithm-1].sort(data); ~}_S]^br
} Sa-" G`
F AQx8P
public static interface Sort { |fB/hs \
public void sort(int[] data); l h?[wc
} D4T42L
mhMTn*9
public static void swap(int[] data, int i, int j) { hZ|8mV
int temp = data; % kaV?j
data = data[j]; M_O)w^ '
data[j] = temp; ~#dfZa&
} *EPJeblAV
} ?X+PNw|pf