[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; sFw;P`
} g17 fge6%
int i1=l; O96%U$W
int i2=mid+1; "f:_(np,
for(int cur=l;cur<=r;cur++){ Ou{VDE
if(i1==mid+1) zg$NrI&
data[cur]=temp[i2++]; /"@cv{
else if(i2>r) =F09@C,
data[cur]=temp[i1++]; 2]cU:j6G
else if(temp[i1] data[cur]=temp[i1++]; J+m1d\lBu
else b}!T!IP}
data[cur]=temp[i2++]; X#Hl<d2
} `\yQn7 Oq
} Qv]>L4PO
_2X6c,
} z@[-+Q:
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改进后的归并排序: ;%Kh~
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package org.rut.util.algorithm.support; 7M<co,"
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import org.rut.util.algorithm.SortUtil; cUr5x8<W).
_ ($U\FW
/** 7{p6&xXx
* @author treeroot ~p x2kHZ
* @since 2006-2-2 lBLL45%BIN
* @version 1.0 y.gjs<y
*/ 10CRgrZ
public class ImprovedMergeSort implements SortUtil.Sort { H18pVh
t**MthnW
private static final int THRESHOLD = 10; 5%"sv+iO
m8Rt>DY
/* $Y[C A.F
* (non-Javadoc) eC`G0.op
* k,61Va
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 6*:U1{Gl)
*/ Pr3>}4M
public void sort(int[] data) { >,x``-
int[] temp=new int[data.length]; lJt?0;gn
mergeSort(data,temp,0,data.length-1); WmuYHEU
} 4VhKV JX
Jk57| )/
private void mergeSort(int[] data, int[] temp, int l, int r) { T@d4NF#
int i, j, k; O@a7MzJ
int mid = (l + r) / 2; O+t'E9Fa
if (l == r) {Rq5=/b
return; G%>M@nYUE
if ((mid - l) >= THRESHOLD) |xrnLdng0R
mergeSort(data, temp, l, mid); \lF-]vz*
else 8aTo TA7JA
insertSort(data, l, mid - l + 1); \f'=
if ((r - mid) > THRESHOLD) kV4,45r
mergeSort(data, temp, mid + 1, r); "] ]aF1
else ~0rvrDDg
insertSort(data, mid + 1, r - mid); 0(Hzh?t_
<sG}[:v
for (i = l; i <= mid; i++) { dst!VO: M
temp = data; hbm#H7Y
} d(C5i8d
for (j = 1; j <= r - mid; j++) { e6Kyu*
temp[r - j + 1] = data[j + mid]; QObHW[:F
} 5ljEh -
int a = temp[l]; V`}u:t7r
int b = temp[r]; :XB^IyO-A
for (i = l, j = r, k = l; k <= r; k++) { aX? tnDv
if (a < b) { W8M(@* T
data[k] = temp[i++]; Z<#h$XUA
a = temp; xn anca
} else { ?N&s.
data[k] = temp[j--]; 1ezBnZJg
b = temp[j]; T3PwM2em_`
} d?aZk-|c
} ,3W,M=j)
} Y?:"nhN
<MJ-w1A
/** *9(E0"
* @param data 3-BC4y/
* @param l =d/$B!t{
* @param i P?Kg7m W
*/ XO}SPf-
private void insertSort(int[] data, int start, int len) { !UHX?<3r
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); \{={{O
} w{ Pl
} av~kF
} cXK.^@du
} p MR4]G
" :V@AT
堆排序： }brBhe8a
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package org.rut.util.algorithm.support; w!OYH1ds]_
uCc5)
import org.rut.util.algorithm.SortUtil; &.JJhX
vJe c+a
/** gUme({h&|
* @author treeroot oiQ:&$y
* @since 2006-2-2 'ql<R0g
* @version 1.0 $?uLFD
*/ oG c9 6B%
public class HeapSort implements SortUtil.Sort{ "Rn@yZV
UQjYWXvi
/* (non-Javadoc) pW_mS|
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) *A0*.>@N
*/ `E|>K\
public void sort(int[] data) { 0@RVM|
MaxHeap h=new MaxHeap(); =b>e4I@
h.init(data); \zhCGDm1_
for(int i=0;i h.remove(); K;]Dh?
System.arraycopy(h.queue,1,data,0,data.length); U "v=XK)!
} M|7][!<G!
U5[r&Y D
private static class MaxHeap{ py6O\` \
gps.
void init(int[] data){ # ELYPp]6
this.queue=new int[data.length+1]; %- Ga^[
for(int i=0;i queue[++size]=data; >J{e_C2ZS
fixUp(size); zICrp
} zb.sh
} S 9;FD3
z&z5EtFUTh
private int size=0; ,r;E[k@
p]jG ,S
private int[] queue; K4b2)8
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public int get() { dw'P =8d
return queue[1]; \_7'f
} ' ?a d
\vE-;,
public void remove() { v!AfIcEV
SortUtil.swap(queue,1,size--); Yn>FSq^Wp-
fixDown(1); u]P9ip"Z
} $?On,U
file://fixdown y:k7eE"
private void fixDown(int k) { 3?TUt{3g
int j; JY%l1:}G3
while ((j = k << 1) <= size) { ? 3oUkGfn
if (j < size %26amp;%26amp; queue[j] j++; J)sOne
if (queue[k]>queue[j]) file://不用交换 79B+8= K
break; C|]Zpn#{K
SortUtil.swap(queue,j,k); u$qazj
k = j; Y6a9S`o
} G6qFAepwi
} }S{VR(i`J
private void fixUp(int k) { lYU?j|n
while (k > 1) { df/7u}>9
int j = k >> 1; zUWeOR'X
if (queue[j]>queue[k]) SPnW8
break; 0> QqsQ
SortUtil.swap(queue,j,k); 9{%/I
k = j; [-^xw1:
} =-avzuy#
} sTvw@o*
uEkGo5
} ;aH3{TS
2#Qw
} W+Ou%uv}S
:\^jIKvZ
SortUtil： W>u{JgY
sHQO*[[
package org.rut.util.algorithm; 9TEAM<b;
J\Tu=f)
import org.rut.util.algorithm.support.BubbleSort; vnqLcNB H
import org.rut.util.algorithm.support.HeapSort; 3bHB$n
import org.rut.util.algorithm.support.ImprovedMergeSort; (W#^-*$R
import org.rut.util.algorithm.support.ImprovedQuickSort; /1eeNbd
import org.rut.util.algorithm.support.InsertSort; 6 kD.
import org.rut.util.algorithm.support.MergeSort; NleMZ
import org.rut.util.algorithm.support.QuickSort; 9 $^b^It
import org.rut.util.algorithm.support.SelectionSort; eL [.;_
import org.rut.util.algorithm.support.ShellSort; $)6x3&]P
7_J0[C!G
/** }/jWa|)f
* @author treeroot gI/(hp3ob
* @since 2006-2-2 {uxTgX
* @version 1.0 I(j$^DA.
*/ >|mZu)HIY;
public class SortUtil { 8Ep!
public final static int INSERT = 1; +5GPU 9k
public final static int BUBBLE = 2; ~DS.b-E
public final static int SELECTION = 3; v3wq-
public final static int SHELL = 4; |g"K7XfM4
public final static int QUICK = 5; ED>P>Gg
public final static int IMPROVED_QUICK = 6; 'Jd*r(2d
public final static int MERGE = 7; kpMo7n
public final static int IMPROVED_MERGE = 8; #!P>.".
public final static int HEAP = 9; (/ -90u
sYB2{w
public static void sort(int[] data) { "oh;?gQ.
sort(data, IMPROVED_QUICK); )!FheoR
} y s[z[
private static String[] name={ znAo]F9=J"
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" <KX+j,4
}; Nl^uA
o* e'D7
private static Sort[] impl=new Sort[]{ DH)E9HL
new InsertSort(), {9{PU&?(
new BubbleSort(), 77'@U(
new SelectionSort(), YR[I,j
new ShellSort(), 9xeg,#1
new QuickSort(), gOMy8w4>
new ImprovedQuickSort(), ^b 3nEcQn
new MergeSort(), DXZZZ[#
new ImprovedMergeSort(), 24\^{3nOK
new HeapSort() cI-@nV
}; *DvQnj
i/PL!'oq
public static String toString(int algorithm){ r(rT.D&
return name[algorithm-1]; BE!l{
} SeLFubs_
T/:6Z
public static void sort(int[] data, int algorithm) { )!;20Po
impl[algorithm-1].sort(data); N|/gwcKe
} E@-5L9eJ\
gw$?&[wY
public static interface Sort { arvKJmD
public void sort(int[] data); R:[#OH.c
} H#G3CD2&
7c8`D;A-K
public static void swap(int[] data, int i, int j) { y[GqV_~?Y
int temp = data; t+M'05-U2
data = data[j]; MjbgAH-
data[j] = temp; h)s&Nqg1B
} w%(D4ldp
} k7]4TIUD*