[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; D[[|")Fn
} r"gJX
int i1=l; Pe_W;q.
int i2=mid+1; z;,u}u}aI
for(int cur=l;cur<=r;cur++){ wj$<t'MN
if(i1==mid+1) ~rqCN,=d
data[cur]=temp[i2++]; urs,34h
else if(i2>r) .LnGL]/
data[cur]=temp[i1++]; q.^;!f1
else if(temp[i1] data[cur]=temp[i1++]; 8?#/o c
else rK6l8)o
data[cur]=temp[i2++]; i4Q@K,$
} O'p9u@kc
} 5,lEx1{_
hP%M?MKC
} y{B=-\O]
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改进后的归并排序: T9E+\D
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package org.rut.util.algorithm.support; w,p PYf/t
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import org.rut.util.algorithm.SortUtil; ntX3Nt_n
:\`o8`
/** }#RakV4
* @author treeroot ,GhS[VJjR
* @since 2006-2-2 Hh3X \
* @version 1.0 iJI }TVep#
*/ $u6"*|
public class ImprovedMergeSort implements SortUtil.Sort { Fh&G;aEq
[B*x-R[FI
private static final int THRESHOLD = 10; HTv2#
}<0BX\@I
/* }^~F|
* (non-Javadoc) !I{0 _b{
* p}z<Fdu0
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) GE:vp>>}`
*/ 2. NN8PPD"
public void sort(int[] data) { DZ3wCLQtK
int[] temp=new int[data.length]; V# }!-Xj
mergeSort(data,temp,0,data.length-1); }1L4"}L.
} )Yh+c=6 ?
z3{G9Np
private void mergeSort(int[] data, int[] temp, int l, int r) { n:I,PS0H<
int i, j, k; c)6m$5]
int mid = (l + r) / 2; ]NQfX[
if (l == r) X&.ArXn*
return; *2>&"B09`
if ((mid - l) >= THRESHOLD) ;>U2|>5V
mergeSort(data, temp, l, mid); D#9m\o_
else ?um;s-x)
insertSort(data, l, mid - l + 1); ]!W=^!
if ((r - mid) > THRESHOLD) ihhDOmUto
mergeSort(data, temp, mid + 1, r); U|H=Y"pL
else niMsQ
insertSort(data, mid + 1, r - mid); /e5O"@
:[.vM
for (i = l; i <= mid; i++) { IEL%!RFG
temp = data; 6fE7W>la
} Di,^%
for (j = 1; j <= r - mid; j++) { P8OaoPj
temp[r - j + 1] = data[j + mid]; :_`F{rDB
} f <Zxz9
int a = temp[l]; PV.Xz0@R
int b = temp[r]; H*?t^
for (i = l, j = r, k = l; k <= r; k++) { Ea=8}6`s
if (a < b) { D=A&+6B@-
data[k] = temp[i++]; XAD- 'i
a = temp; wyH[x!QX
} else { 9R!atPz9
data[k] = temp[j--]; 1fp?
b = temp[j]; F$y$'Rzu_B
} )J o:pkM
} F>SRs=_
} Co9^OF-k
Pa>AWOG'
/** \i>?q
* @param data Fk&c=V;SU
* @param l 2lZ Q)
* @param i u74[>^
*/ `z}?"BW|
private void insertSort(int[] data, int start, int len) { hE:9{;Gf
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); ;}I:\P
} |MTnH/|
} 2"v6 >b%
} >>4qJ%bL
} }`@vF|2L
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堆排序： :^lI`9'*R
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package org.rut.util.algorithm.support; Po+.&7F
: g7@PJND
import org.rut.util.algorithm.SortUtil; A7{\</Z
7uqzm
/** V5@:#BIs
* @author treeroot 4!{KWL`A
* @since 2006-2-2 ,C\i^>=
* @version 1.0 )EPjAv
*/ OU\~::
public class HeapSort implements SortUtil.Sort{ BiLY(1,
>a<.mU|#
/* (non-Javadoc) }^WdJd]P
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) sPpH*,(
*/ 5+0gR &|j
public void sort(int[] data) { wQl ,
MaxHeap h=new MaxHeap(); x M/+L:_<
h.init(data); #b}Z`u?@
for(int i=0;i h.remove(); IxN9&xa
System.arraycopy(h.queue,1,data,0,data.length); JAnZdfRt
} {GT*ZU*
lWk>z; d
private static class MaxHeap{ IVnHf_PzF
.bl/*s
void init(int[] data){ %bn jgy
this.queue=new int[data.length+1]; yf.~XUk^
for(int i=0;i queue[++size]=data; Mmj;-u
fixUp(size); |*eZD-f
} S"QWB`W2
} Pl06:g2I
se2!N:|R!G
private int size=0; bjW]bRw
V*;(kEqj
private int[] queue; |-67\p]
<]t%8GB2V
public int get() { dm0R[[7
return queue[1]; yx8z4*]kH
} wo{gG?B
`:fZ)$sY
public void remove() { A1$TXr
SortUtil.swap(queue,1,size--); ] )\Pqn(
fixDown(1); \~mT] '5
} LKB$,pR~1l
file://fixdown \;,+
private void fixDown(int k) { cGzPI+F
int j; OX0%C.K)hZ
while ((j = k << 1) <= size) { i v38p%Zm
if (j < size %26amp;%26amp; queue[j] j++; :uS\3toj
if (queue[k]>queue[j]) file://不用交换 =U9*'EFr
break; &vMb_;~B
SortUtil.swap(queue,j,k); / &5,3rU.G
k = j; r.&Vw|*>
} [#vH'y
} R$<&ie6UQ
private void fixUp(int k) { `:KY\
while (k > 1) { Ykw*&opz
int j = k >> 1; ifQ*,+@fxR
if (queue[j]>queue[k]) K#d`Hyx
break; ;?iW%:_,
SortUtil.swap(queue,j,k); %3-y[f
k = j; Np9<:GF1
} CAWNDl4
} BoWg0*5xb
dt]-,Y
} 1N-\j0au
z'n:@E
} b94DJzL1z
{$ JYw{a
SortUtil： *u[BP@vE
OX!tsARC@
package org.rut.util.algorithm; n5NsmVW\x
hd<c&7|G'
import org.rut.util.algorithm.support.BubbleSort; }@+0/W?\.
import org.rut.util.algorithm.support.HeapSort; YnAm{YyI
import org.rut.util.algorithm.support.ImprovedMergeSort; 5coyr`7mP
import org.rut.util.algorithm.support.ImprovedQuickSort; VA_PvL.9
import org.rut.util.algorithm.support.InsertSort; }!r|1$,kL
import org.rut.util.algorithm.support.MergeSort; <{cQM$#
import org.rut.util.algorithm.support.QuickSort; \ :sUL!
import org.rut.util.algorithm.support.SelectionSort; @o _}g !9=
import org.rut.util.algorithm.support.ShellSort; *vxk@`K~
mxC;?s;~
/** b5vC'B-!
* @author treeroot 1~ 3_^3OT
* @since 2006-2-2 }q`S$P;
* @version 1.0 #OD/$f_
*/ ,m:.-iy?
public class SortUtil { WPMSm<[
public final static int INSERT = 1; )9`qG:b'
public final static int BUBBLE = 2; l<LI7Z]A
public final static int SELECTION = 3; AJ`h9%B
public final static int SHELL = 4; BM .~ 5\
public final static int QUICK = 5; JIOR4'9
public final static int IMPROVED_QUICK = 6; $ @`V
public final static int MERGE = 7; .j0$J\:i
public final static int IMPROVED_MERGE = 8; ChPmX+.i_
public final static int HEAP = 9; vMH
:q%M_
public static void sort(int[] data) { #rfiD%c
sort(data, IMPROVED_QUICK); UECK:61Me
} f+,qNvBY/
private static String[] name={ [!#L6&:a8
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" K`zdc`/
}; m@v\(rT.
k"zv~`i'
private static Sort[] impl=new Sort[]{ )U:m:cr<
new InsertSort(), 97C]+2R%^
new BubbleSort(), u?(d gJ
new SelectionSort(), qiD@'Va\
new ShellSort(), k2tF}
new QuickSort(), @9RM9zK.q
new ImprovedQuickSort(), {qJ1ko)$
new MergeSort(), G@X% +$I
new ImprovedMergeSort(), 051E6-
new HeapSort() |{NYkw
}; R"t,xM
WO>nIo5Y
public static String toString(int algorithm){ rcG"o\g@+
return name[algorithm-1]; ,m|h<faZL
} 'yEHI
LYK"(C
public static void sort(int[] data, int algorithm) { }!.(n=idZ
impl[algorithm-1].sort(data); '4Bm;&6M
} EUX\^c]n
O;jrCB
public static interface Sort { aSQ#k;T[
public void sort(int[] data); $Sip$\+*
} LCKV>3+_#
i3mcx)d@H
public static void swap(int[] data, int i, int j) { SRDp*
int temp = data; ~P**O~
data = data[j]; :{l_FY436
data[j] = temp; #r\4sVg
} .|fHy
} \V~eVf;~