[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; U%0Ty|$Y
} cqxVAzb
int i1=l; Wg`R_>qQSm
int i2=mid+1; !8`3GX:B_
for(int cur=l;cur<=r;cur++){ o\vBOp?hj
if(i1==mid+1) U]a*uF~h
data[cur]=temp[i2++]; ){jla,[
else if(i2>r) H@]MXP[_
data[cur]=temp[i1++]; mf'V)
else if(temp[i1] data[cur]=temp[i1++]; /VG2.:
else [w ;kkMJAy
data[cur]=temp[i2++]; \h8 <cTQ
} <w3!!+oK"
} Z"unF9`"1
g^zs,4pPU<
} fhB}9i^]tg
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改进后的归并排序: yDNOtC|
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package org.rut.util.algorithm.support; A 7[:5$
Cu6%h>@K$
import org.rut.util.algorithm.SortUtil; $1SUU F\.
TX
/** "Ks,kSEzu
* @author treeroot :1Sl"?xU
* @since 2006-2-2 ON+J>$[[
* @version 1.0 jt+iv*2N>
*/ )>BHL3@
public class ImprovedMergeSort implements SortUtil.Sort { 4@xE8`+bG
1?Z4K/
private static final int THRESHOLD = 10; ;;&}5jcV
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/* *hcYGLx r
* (non-Javadoc) cu+FM
* [z7bixN
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) I!^O)4QRx
*/ fFQ|T:vm
public void sort(int[] data) { [` sL?&a
int[] temp=new int[data.length]; #:SNHM^><
mergeSort(data,temp,0,data.length-1); 4`,j=3
} .bio7c6
1^gl}^|B
private void mergeSort(int[] data, int[] temp, int l, int r) { irjP>3_e
int i, j, k; m#=z7.XrX
int mid = (l + r) / 2; $ `7^+8vHV
if (l == r) _YRE (YZ/
return; sJNFFOz
if ((mid - l) >= THRESHOLD) $ MC)}l
mergeSort(data, temp, l, mid); 5atYOep
else 8_N]e'WUh
insertSort(data, l, mid - l + 1); ;| 1$Q!4
if ((r - mid) > THRESHOLD) i~r l o^
mergeSort(data, temp, mid + 1, r); z;y:9l
else |fo0
insertSort(data, mid + 1, r - mid); 5eWwgA
"yW:\
for (i = l; i <= mid; i++) { JfPD}w
temp = data; X]y)qV)a[c
} ={u0_j W
for (j = 1; j <= r - mid; j++) { 6^DR0sO
temp[r - j + 1] = data[j + mid]; m4*@o?Ow
} G z)NwD
int a = temp[l]; Po%(~ )S>
int b = temp[r]; 3h<,
for (i = l, j = r, k = l; k <= r; k++) { ]kboG%Dl?9
if (a < b) { RD.V'`n"
data[k] = temp[i++]; I|Gp$uq _
a = temp; Rn@#d}
} else { A~mum+[5
data[k] = temp[j--]; 7x<i :x3
b = temp[j]; jRatm.N
} LW(6$hpPp
} !kC*g
} k!{p7*0
$kQ~d8 O
/** eY e,r
* @param data 1UQHq@aM
* @param l QPq7R
* @param i KZeQ47|
*/ 0Zg%+)iy@
private void insertSort(int[] data, int start, int len) { '}9JCJ
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); Lco&Fp
} {%C7EAq*
} K^R,Iu/M
} @$z<i `4
} M %Qt|@O
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堆排序： x|vqNZ\F
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package org.rut.util.algorithm.support; 2;?I>~
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import org.rut.util.algorithm.SortUtil; T'~!9Q
)l#E}Uz
/** /:FOPPs
* @author treeroot bAx?&$
* @since 2006-2-2 `HBf&Z
* @version 1.0 OD_W8!-
*/ _l1NKk
public class HeapSort implements SortUtil.Sort{ `ta7Gc/:UY
l(Q?rwI8Y
/* (non-Javadoc) KSrx[q
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ?y!E-&
*/ 95V@X ^Ee
public void sort(int[] data) { =xS+5(
MaxHeap h=new MaxHeap(); hh[jN7K
h.init(data); x@Hc@R<!
for(int i=0;i h.remove(); )[Yv?>ib
System.arraycopy(h.queue,1,data,0,data.length); nb>7UN.9
} ivz{L-
-(bkr+N
private static class MaxHeap{ <Z/x,-^*<
_H/8_[xk
void init(int[] data){ ?)#5X_V-q
this.queue=new int[data.length+1]; "V}[':fen
for(int i=0;i queue[++size]=data; Q6r7.pk"SU
fixUp(size); pn^ d]rou?
} rX1QMR7?
} R`~z0d.
9cj9SB4
private int size=0; LA)[ip4
%?Ev|:i`@
private int[] queue; ~T89_L
7!N2-6GV
public int get() { mtjh`
return queue[1]; FeTL&$O
} ::/j$bL
10U9ZC
public void remove() { Qg<(u?7N
SortUtil.swap(queue,1,size--); .?hP7;hhI
fixDown(1); 1&U>,;]*
} $-*!pRaVU
file://fixdown "%x<ttLl
private void fixDown(int k) { @#-q^}3
int j; <(-hx+^
while ((j = k << 1) <= size) { /n8B,-Z5s5
if (j < size %26amp;%26amp; queue[j] j++; ze]h..,]K
if (queue[k]>queue[j]) file://不用交换 yiA<,!;4P
break; _:"<[ >9
SortUtil.swap(queue,j,k); ,xxR\}
k = j; 9\DQ>V TQ
} `9b7>Nn<
} fP `b>]N_
private void fixUp(int k) { `{xNXH]@
while (k > 1) { +o51x'Ld*
int j = k >> 1; O7$hYk
if (queue[j]>queue[k]) ~7Tc$ "I
break; 6efnxxY}sa
SortUtil.swap(queue,j,k); X7g1:L1Ys
k = j; G"XVn~]
} VH1d$
} =>! Y{: y(
[bk?!0]aV
} KFwzy U"
yu/`h5&*
} |1>*;\o-
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SortUtil： S9",d~EM
8zR~d%pK
package org.rut.util.algorithm; k'5?M
ksN+?E4w
import org.rut.util.algorithm.support.BubbleSort; }I2@%tt?
import org.rut.util.algorithm.support.HeapSort; fOMW"myQ
import org.rut.util.algorithm.support.ImprovedMergeSort; 9b*nLyYVz
import org.rut.util.algorithm.support.ImprovedQuickSort; ZKckAz\#
import org.rut.util.algorithm.support.InsertSort; %&Q$dzgb_
import org.rut.util.algorithm.support.MergeSort; aWY gR
import org.rut.util.algorithm.support.QuickSort; L# 2+z@g
import org.rut.util.algorithm.support.SelectionSort; 7fba-7-P
import org.rut.util.algorithm.support.ShellSort; w2'f/
pn5Q5xc
/** C-H@8p?T
* @author treeroot `u&Zrdr,
* @since 2006-2-2 gjAIEI
* @version 1.0 ~'CE[G5
*/ ML>[^F
public class SortUtil { *=*AAF
public final static int INSERT = 1; z21|Dhiw&
public final static int BUBBLE = 2; /Bm( `T
public final static int SELECTION = 3; #Q`dku%V:
public final static int SHELL = 4; [a wjio
public final static int QUICK = 5; fu]s/'8B
public final static int IMPROVED_QUICK = 6; LMAE)]N
public final static int MERGE = 7; sU{NHC)5
public final static int IMPROVED_MERGE = 8; vsl]92xI
public final static int HEAP = 9; c>)Yt^q&K
d>t<_}
public static void sort(int[] data) { A'&K/)Z
sort(data, IMPROVED_QUICK); -u8NF_{c
} @("a.;1#o
private static String[] name={ p$3sME$L
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" _ "VkGG
}; e!=kWc
[6XF=L,!
private static Sort[] impl=new Sort[]{ Xn%pNxUL
new InsertSort(), L>RP-x>
new BubbleSort(), Ls] g
new SelectionSort(), R'@9]99
new ShellSort(), #odIEC/
new QuickSort(), ,~]tg77
new ImprovedQuickSort(), %s(k_|G+4
new MergeSort(), "pRtczxOgR
new ImprovedMergeSort(), b7p@Dn?E
new HeapSort() aD$v2)RR
}; S_IUV)
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public static String toString(int algorithm){ 4QIX19{"
return name[algorithm-1]; G%W8S \
} /Y7<5!cS
-K3^BZHI
public static void sort(int[] data, int algorithm) { ^>hWy D
impl[algorithm-1].sort(data); "\o+v|;
} -RvQB
cLsV`@J(k
public static interface Sort { @8ppEFw
public void sort(int[] data); W)f/0QX}W
} Pf\D-1gi
m4l& eEp
public static void swap(int[] data, int i, int j) { WL?\5?G9l
int temp = data; rcC<Zat,|
data = data[j]; s pp f
data[j] = temp; ~2QR{; XQ
} O4V.11FnW
} KQg]0y d