[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; 4p]hY!7
} Jm3iYR+,
int i1=l; y2@8?
int i2=mid+1; Ombvp;
for(int cur=l;cur<=r;cur++){ h"(HDnq
if(i1==mid+1) }O8#4-E_Ji
data[cur]=temp[i2++]; Os)}kkja
else if(i2>r) D1~3 3;
data[cur]=temp[i1++]; a*?,wmzl
else if(temp[i1] data[cur]=temp[i1++]; =aRE
else t**o<p#)f
data[cur]=temp[i2++]; 3k* U/*
} FQw@@
} !;.nL-NQ
xmwH~UWp
} IfpFsq:
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改进后的归并排序: ?OdJt
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package org.rut.util.algorithm.support; qW t 9Tr
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import org.rut.util.algorithm.SortUtil; Jc,{n*
so }Kb3n
/** QW6\~l 4
* @author treeroot 6Ej@;]^^-
* @since 2006-2-2 xyRZ v]K1
* @version 1.0 Z{ b($po
*/ ?iaD;:'qE
public class ImprovedMergeSort implements SortUtil.Sort { S1W(]%0/
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private static final int THRESHOLD = 10; v`9n'+h-c6
<rFKJ^B
/* r?wE;gH
* (non-Javadoc) -,}ppTG
* 'E~[I"0
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 5Y(f7,JX
*/ NTL`9b
public void sort(int[] data) { (ZHEPN
int[] temp=new int[data.length]; ?o.Q
mergeSort(data,temp,0,data.length-1); &#qy:
} ~U_,z)<`)c
NRZ>03w
private void mergeSort(int[] data, int[] temp, int l, int r) { 3qBZzM O*
int i, j, k; @M]7',2"
int mid = (l + r) / 2; yf7$m_$C'
if (l == r) O;~dao
return; Pdw[#X<[`
if ((mid - l) >= THRESHOLD) 9Sk?tl
mergeSort(data, temp, l, mid); -<.b3Mh
else Mwd(?o
insertSort(data, l, mid - l + 1); o;2QZ"v
if ((r - mid) > THRESHOLD) "+:~#&r
mergeSort(data, temp, mid + 1, r); 5b-: e? |
else K(B|o6[
insertSort(data, mid + 1, r - mid); gv,8Wo
[G[|auKF
for (i = l; i <= mid; i++) { XhxCOpO
temp = data; RE}$(T=
} ({#M*=&"
for (j = 1; j <= r - mid; j++) { H}B%OFI\+
temp[r - j + 1] = data[j + mid]; [_?dpaTt
} q/HwcX+[b
int a = temp[l]; mo- Y %
int b = temp[r]; iLD:}yK
for (i = l, j = r, k = l; k <= r; k++) { &ZUV=q%g9n
if (a < b) { & !I$
data[k] = temp[i++]; 298@&_
a = temp; uGMmS9v$ J
} else { BV01&.<|
data[k] = temp[j--]; QL_9a,R'r
b = temp[j]; ',P E25Z
} &?gvW//L2
} 7;;HP`vY
} {@w!kl~8
G@Y!*ZH*f
/** _}(ej&'f
* @param data E/_I$<,_y
* @param l I?!7]Sn$
* @param i k(.6K[b
*/ dCkk5&2n
private void insertSort(int[] data, int start, int len) { PhOtSml0
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); y,QJy=?
} :gJ?3LwTf
} I@<\DltPi
} Z&E!m
} .#[==
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堆排序： }L.&@P<
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package org.rut.util.algorithm.support; `gFE/i18
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import org.rut.util.algorithm.SortUtil; I?_YL*
oe{K0.`
/** nVt,= ?_ U
* @author treeroot U4*Q;A#
* @since 2006-2-2 ^*=.Vuqy
* @version 1.0 T,D(Xh
*/ A\v(!yg
public class HeapSort implements SortUtil.Sort{ ^<VJ8jk<
jA}b=c
/* (non-Javadoc) o6[aP[~F
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) |kXx9vGq@
*/ c/Ykk7T9--
public void sort(int[] data) { 2)zAX"#/
MaxHeap h=new MaxHeap(); C>:'@o Z
h.init(data); b,Vg3BS
for(int i=0;i h.remove(); }[gk9uM_7
System.arraycopy(h.queue,1,data,0,data.length); ecRY,MN
} #{BHH;J+
QwSYjR:K
private static class MaxHeap{ jJK`+J,i}X
Q'B2!9=LB
void init(int[] data){ %P2l@}?a
this.queue=new int[data.length+1]; = olmBXn/
for(int i=0;i queue[++size]=data; yxx'g+D*
fixUp(size); GF=rGn@,)`
} B3V;
} HDY2<Hzc
EDf"1b{PX
private int size=0; 9_
'M'k$G@Z
private int[] queue; Gjh8>(
<X b B;
public int get() { mhDC1lXF
return queue[1]; i=^!? i
} J )DFH~p
74p=uQ
public void remove() { 5SNa~ kC&
SortUtil.swap(queue,1,size--); "A]Xe[oS
fixDown(1); %qYiE!%&
} t3// U#
file://fixdown tvlrUp
private void fixDown(int k) { (rfR:[JkC2
int j; p?v.42R:z
while ((j = k << 1) <= size) { _P{f+HxU
if (j < size %26amp;%26amp; queue[j] j++; [<,i}z
if (queue[k]>queue[j]) file://不用交换 CVy\']
break; nde_%d$
SortUtil.swap(queue,j,k); W Y]
k = j; +\_c*'K>
} 6B=: P3Y
} !5}u\
private void fixUp(int k) { P\lEfsuR
while (k > 1) { Na$eeM
int j = k >> 1; !JGe .U5
if (queue[j]>queue[k]) b?kY`LC
break; 00-cT9C3
SortUtil.swap(queue,j,k); psFY=^69o
k = j; }83a^E9L
} "-T[D9(A
} G=ly .
=G,wR'M
} !K[UJQs\
qbsmB8rh
} y<5RV>"Vg
$~+(si2
SortUtil： a-bj! Rs
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package org.rut.util.algorithm; NZoNsNu*C.
6D&{+;
import org.rut.util.algorithm.support.BubbleSort; /f}!G
import org.rut.util.algorithm.support.HeapSort; je`Ysben
import org.rut.util.algorithm.support.ImprovedMergeSort; JJZu%9~[
import org.rut.util.algorithm.support.ImprovedQuickSort; >2t.7UhDI
import org.rut.util.algorithm.support.InsertSort; d2a*xDkv
import org.rut.util.algorithm.support.MergeSort; YLsOA`5X
import org.rut.util.algorithm.support.QuickSort; 2if7|o$=
import org.rut.util.algorithm.support.SelectionSort; MfA@)v
import org.rut.util.algorithm.support.ShellSort; /Bw <?:
q)j_QbW)
/** TKe\Bi
* @author treeroot D>fg
* @since 2006-2-2 [p+-]V
* @version 1.0 C==yl"w
*/ v8} vk]b
public class SortUtil { .sCj3sX*
public final static int INSERT = 1; VtN1 [}
public final static int BUBBLE = 2; \'Q rJ ?D
public final static int SELECTION = 3; CBr(a'3{Z
public final static int SHELL = 4; 3%[;nhbA7
public final static int QUICK = 5; g2;lEW
public final static int IMPROVED_QUICK = 6; ;p+[R+ )
public final static int MERGE = 7; [eO^C
public final static int IMPROVED_MERGE = 8; :;hz!6!
public final static int HEAP = 9; 7,lnfCm H
AxtmG\o>
public static void sort(int[] data) { X`6"^ xme
sort(data, IMPROVED_QUICK); 7 'q *(v
} QdrZi.qKH
private static String[] name={ smUSR4VK
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" /rIyW?& f
}; lQM&q
w7@TM%nS
private static Sort[] impl=new Sort[]{ 85T"(HhT
new InsertSort(), yT~rql
new BubbleSort(), OUk"aAo
new SelectionSort(), -3K01p
new ShellSort(), \(A A|;
new QuickSort(), (Z0_e&=*
new ImprovedQuickSort(), ^B)f!HtU
new MergeSort(), 'eo/"~/*w
new ImprovedMergeSort(), ;,}Dh/&E
new HeapSort() Z%Fc -KVt
}; 5%%e$o+
3_ly"\I\
public static String toString(int algorithm){ _a#k3r
return name[algorithm-1]; ,v%'2[}
} @y'0_Y0-B
u4h0s1iI
public static void sort(int[] data, int algorithm) { ^)y8X.iO
impl[algorithm-1].sort(data); Yb=77(QV
} 3=Q:{
=%B5TBG
public static interface Sort { 6_s(Kx>j
public void sort(int[] data); Nq%ir8hE
} eaC%&k
#;yxn.</
public static void swap(int[] data, int i, int j) { `*l aUn
int temp = data; H$+@O-
data = data[j]; <D[0mi0
data[j] = temp; ]OtnekkK$
} {Q}F.0Q
} L>h|1ZK