[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; aKdi
} |U}al[
int i1=l; V$O{s~@ti
int i2=mid+1; XKqUbi
for(int cur=l;cur<=r;cur++){ o<T_Pjp
if(i1==mid+1) 4OLq
data[cur]=temp[i2++]; *G)=6\
else if(i2>r) jFYv4!\ju
data[cur]=temp[i1++]; %,Fx qw
else if(temp[i1] data[cur]=temp[i1++]; ][R#Q;y<
else NQCJ '%L6
data[cur]=temp[i2++]; wIT0A-Por4
} p-QD(+@M
} fyat-wbb
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} ghq#-N/t
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改进后的归并排序: SenDJv00
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package org.rut.util.algorithm.support; =sVB.P
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import org.rut.util.algorithm.SortUtil; <=KtRE>$
5N=QS1<$5
/** ?ysC7((
* @author treeroot mup<%@7m
* @since 2006-2-2 NIn#
* @version 1.0 =#qf0
*/ Vm NCknG
public class ImprovedMergeSort implements SortUtil.Sort { {%!.aQ,
; ntq%
private static final int THRESHOLD = 10; :BFecS&i5
*G|w#-\.c
/* r@;n \
* (non-Javadoc) C^vB&3ghi
* fbaQXM
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) h"<-^=b
*/ 5"1kfB3v
public void sort(int[] data) { G2Zr(b')
int[] temp=new int[data.length]; cnfjOg'\{
mergeSort(data,temp,0,data.length-1); J)R;NYl
} 0&!,+
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private void mergeSort(int[] data, int[] temp, int l, int r) { R<>ptwy
int i, j, k; }lZfZ?oAz
int mid = (l + r) / 2; Q)}_S@v|%
if (l == r) _G]f v'
return; VFLxxFJ
if ((mid - l) >= THRESHOLD) #kD8U#
mergeSort(data, temp, l, mid); 83io@*D
else E:,V{&tLK
insertSort(data, l, mid - l + 1); NEInro<
if ((r - mid) > THRESHOLD) 8RS=Xemds
mergeSort(data, temp, mid + 1, r); XI#1)
else =m{]Xep
insertSort(data, mid + 1, r - mid); P9j[ NEV
8.9TWsZ
for (i = l; i <= mid; i++) { A1`y_ Aj
temp = data; =<nx[J
} "p<B|
for (j = 1; j <= r - mid; j++) { |y+<|fb,a
temp[r - j + 1] = data[j + mid]; 'urn5[i
} Jr/|nhGl5
int a = temp[l]; CT1)tRN
int b = temp[r]; fhCMbq4T
for (i = l, j = r, k = l; k <= r; k++) { a`XXz
if (a < b) { ^,`;x
data[k] = temp[i++]; W10=SM}
a = temp; 24u;'i-y5
} else { v[efM8
data[k] = temp[j--]; 0"q^`@sZ
b = temp[j]; )@"iWQ3K
} . e' vc
} $f`\TKlN
} mx`C6G5
]F:5-[V#
/** +r0ItqkM
* @param data Z]H`s{3
* @param l vb 2mY
* @param i ZMs$C3
*/ Er; @nOyD
private void insertSort(int[] data, int start, int len) { h*J=F0KM
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); hdZ{8 rP
} >0yx!Iao
} YcJZG|[
} |TCHPKN
} 6|q\ M
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堆排序： NYS|fa
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package org.rut.util.algorithm.support; }cDw9;~D
laVqI|0q
import org.rut.util.algorithm.SortUtil; WW5AD$P*
;9w:%c1
/** j*uc$hC"
* @author treeroot >s3H_X3F
* @since 2006-2-2 #:E}Eby/6I
* @version 1.0 O>P792)
*/ )TNAgTmqK
public class HeapSort implements SortUtil.Sort{ @f<q&K%FJ
:__z?<?(
/* (non-Javadoc) KW^#DI6tr
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) qY^OO~[
*/ ]Puu: IG
public void sort(int[] data) { E3IB> f
MaxHeap h=new MaxHeap(); r`? bYoz
h.init(data); fQZ,kl
for(int i=0;i h.remove(); 5[^pU$Y
System.arraycopy(h.queue,1,data,0,data.length); \*5`@>_
} v[S>
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private static class MaxHeap{ ,{{e'S9cy
:u}FF"j
void init(int[] data){ qo2/?]
this.queue=new int[data.length+1]; /%W&zd=%#
for(int i=0;i queue[++size]=data; >lZ9Y{Y4v
fixUp(size); %`rZ]^H
} lFHj]%Y
} ?!PpooYK
zT;F4_p3G-
private int size=0; |UA)s3Uhxb
:aYbP,mE
private int[] queue; `tmd'
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public int get() { 85$W\d
return queue[1]; ``l7|b jJ
} |7 .WP;1
JA .J~3
public void remove() { v;!f
SortUtil.swap(queue,1,size--); ?OW!zE:
fixDown(1); fU@{!;|Pz
} ^SdorPOq&
file://fixdown ==$>M d
private void fixDown(int k) { G5JZpB#o
int j; {yPJYF_l
while ((j = k << 1) <= size) { B2}|b^'I
if (j < size %26amp;%26amp; queue[j] j++; R?,Oh*
if (queue[k]>queue[j]) file://不用交换 %<4ZU!2L
break; eVDO]5?
SortUtil.swap(queue,j,k); "qb1jv#to
k = j; 1y/_D$~ZO
} 3`V#ImV>
} F(?A7
private void fixUp(int k) { d(LX;sq?
while (k > 1) { vjfV??XSU
int j = k >> 1; FH"u9ygF
if (queue[j]>queue[k]) &y164xn'h
break; s\7]"3:wD
SortUtil.swap(queue,j,k); UOi[#L@N
k = j; y81B3`@
} zUw=e}?:
} e MX?x7
"oZ$/ap\
} /wF*@/PTH
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} o;d><
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SortUtil： fu}ZOPu
^ Tr )gik
package org.rut.util.algorithm; p3sR>ToJ
6xFvu7L_c;
import org.rut.util.algorithm.support.BubbleSort; 3%"r%:fQB/
import org.rut.util.algorithm.support.HeapSort; bV'^0(Zv
import org.rut.util.algorithm.support.ImprovedMergeSort; K6C@YY(
import org.rut.util.algorithm.support.ImprovedQuickSort; X`REhvT
import org.rut.util.algorithm.support.InsertSort; @wzzI 7}C
import org.rut.util.algorithm.support.MergeSort; u0Nag=cU
import org.rut.util.algorithm.support.QuickSort; g;|3n&
import org.rut.util.algorithm.support.SelectionSort; _A[k&nO!&J
import org.rut.util.algorithm.support.ShellSort; Klw\
jB"?iC.
/** YIb=rR[ $
* @author treeroot 3k5C;5
* @since 2006-2-2 L=Pz0
* @version 1.0 3,x|w
*/ nhbCk6Y5LZ
public class SortUtil { WyO7,Qr\
public final static int INSERT = 1; a{oG[e
public final static int BUBBLE = 2; 38I.1p9
public final static int SELECTION = 3; @U~i<kt
public final static int SHELL = 4; Wr3).m52}P
public final static int QUICK = 5; >= G{.H
public final static int IMPROVED_QUICK = 6; Zx%ib8|j
public final static int MERGE = 7; ( !K?^si
public final static int IMPROVED_MERGE = 8; >4c7r~\k
public final static int HEAP = 9; d[cqs9=\
)#NT*@j`
public static void sort(int[] data) { @Ido6Z7
sort(data, IMPROVED_QUICK); mJj [f8
} =vqy5y
private static String[] name={ '+@q
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" gj\'1(Ju
}; ]Wn^m+
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private static Sort[] impl=new Sort[]{ k7R8Q~4
new InsertSort(), N-lo[bDJh
new BubbleSort(), f&z@J,_=
new SelectionSort(), 6}Iu~|5
new ShellSort(), .Mn+Bd4f
new QuickSort(), eM3-S=R?<g
new ImprovedQuickSort(), jbDap i<
new MergeSort(), 4| 6<nk_
new ImprovedMergeSort(), }D/O cp~o
new HeapSort() ]8Eci^i
}; =V)88@W
BA1|%:.
public static String toString(int algorithm){ 1$Jria5n
return name[algorithm-1]; XAn{xNpz
} ?Re6oLm<B
hI&ugdf
public static void sort(int[] data, int algorithm) { 1XwW4cZ>:
impl[algorithm-1].sort(data); 5BztOYn,
} $p(,Qz(.8
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public static interface Sort { "0,d)L0,"
public void sort(int[] data); AU3Ou5
} k|ol+ 9Z
\Mi] !b|8
public static void swap(int[] data, int i, int j) { +IRr&J*P
int temp = data; %lr<;
data = data[j]; POnI&y]
data[j] = temp; &~%( RO
} tt|v opz
} #P)7b,3pe