[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; jb{9W7;RL
} *'aouS/?<6
int i1=l; 56.JBBZZ
int i2=mid+1; P1B=fgT
for(int cur=l;cur<=r;cur++){ -$I30.#
if(i1==mid+1) <r`;$K
data[cur]=temp[i2++]; X(rXRP#
else if(i2>r) PAtv#)h
data[cur]=temp[i1++]; 9F?-zn;2s
else if(temp[i1] data[cur]=temp[i1++]; :@ VCKq!
else ,S(s
data[cur]=temp[i2++]; 5MD'AP:
} 5??}9
} ysl#Rwt/2
yWE\)]9
} D .LR-Z
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改进后的归并排序: kWy@wPqms
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package org.rut.util.algorithm.support; `Syfl^9B
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import org.rut.util.algorithm.SortUtil; ~J>;l s1
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/** }Nwp{["}]L
* @author treeroot %7w8M{I R3
* @since 2006-2-2 yjH'<
* @version 1.0 0Q?%B6g$m[
*/ jYFmL_{
public class ImprovedMergeSort implements SortUtil.Sort { t u{~:Z(
#s15AyKz5
private static final int THRESHOLD = 10; 3 H5
_)!*,\*`{
/* ?Tu=-ppw
* (non-Javadoc) N-knhA
* e84%Y8,0
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 0GeL">v,:=
*/ NA'45}fQ
public void sort(int[] data) { A#19&}
int[] temp=new int[data.length]; jw{B8<@s
mergeSort(data,temp,0,data.length-1); ->.9[|lIg
} ",Vx.LV
e*PUs
private void mergeSort(int[] data, int[] temp, int l, int r) { T]tu#h{ a
int i, j, k; JMo r[*
int mid = (l + r) / 2; (w5cp!qW9J
if (l == r) "kBVHy
return; ID!S}D
if ((mid - l) >= THRESHOLD) <)T~_s
mergeSort(data, temp, l, mid); _@[W[=|H
else 6 R})KIG
insertSort(data, l, mid - l + 1); jgG9?w)|u
if ((r - mid) > THRESHOLD) GiEt;8
mergeSort(data, temp, mid + 1, r); As,e.V5!
else Ut;4`>T
insertSort(data, mid + 1, r - mid); |UMm>.\'
t8h*SHD9
for (i = l; i <= mid; i++) { -T{2R:\{
temp = data; B@i%B+qCLv
} "-dA\,G
for (j = 1; j <= r - mid; j++) { q>>1?hzA
temp[r - j + 1] = data[j + mid]; cc_'Kv!
} ~LV]cX2J(
int a = temp[l]; >dm9YfQ
int b = temp[r]; Q1x&Zm1v
for (i = l, j = r, k = l; k <= r; k++) { Lw_|o[I}
if (a < b) { Wkjp:`(-$r
data[k] = temp[i++]; .Wy'
a = temp; PuGs%{$(h
} else { f+n {9Hz
data[k] = temp[j--]; ~wv$uL8y
b = temp[j]; E?P>s T3B
} 5V =mj+X?
} r~f;g9I
} V@-Q&K#
xsJXf @
/** 6vE#$(n#a&
* @param data DwGM+)!
* @param l ;R#RdUFH
* @param i 6o3#<ap<
*/ RO/(Ldh
private void insertSort(int[] data, int start, int len) { B>!mD{N
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); JW^ ${4
} 7g+T
} oe 6-F)+
} QkD ~
} 0!0e$!8l
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堆排序： S\A0gOL^
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package org.rut.util.algorithm.support; m[3c,Axl7
83/m^^F{]
import org.rut.util.algorithm.SortUtil; d<Q%h?E
]3f[v:JQ
/** &;P\e
* @author treeroot u^{p'a'
* @since 2006-2-2 js <Up/1
* @version 1.0 @_-,Q5
*/ -k8sR1(
public class HeapSort implements SortUtil.Sort{ =d^hiR!GN
W&|?8%"l]
/* (non-Javadoc) o^UOkxs.
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 4aBVO%t
*/ ppvlU H5;
public void sort(int[] data) { !8[A;+o3P
MaxHeap h=new MaxHeap(); }s<;YC
h.init(data); i.)n#@M2
for(int i=0;i h.remove(); !<=zFy[J.9
System.arraycopy(h.queue,1,data,0,data.length); n(eo_.W2|
} 5!qf{4j
pY )x&uM!
private static class MaxHeap{ z`E=V
K2xHXziQ
void init(int[] data){ : q%1Vi
this.queue=new int[data.length+1]; tNzO1BK
for(int i=0;i queue[++size]=data; HB5-B XBU
fixUp(size); * BR#^Wt
} %~Rg`+
} FP=- jf/
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private int size=0; Y]0c%Fd
g*YA~J@
private int[] queue; u$[8Zmgzz
59l9_yFJ
public int get() { v:/!OvLe
return queue[1]; X coPkW
} Q> y!
_1G/qHf^S
public void remove() { &k}B66
SortUtil.swap(queue,1,size--); >(igVaZ>
fixDown(1); q 9xA.*
} ^#Q-?O
file://fixdown V^[&4
private void fixDown(int k) { (W:@v&p
int j; $RYGAh
while ((j = k << 1) <= size) { P* 0kz@
if (j < size %26amp;%26amp; queue[j] j++; L f"!:]
if (queue[k]>queue[j]) file://不用交换 [y'blCb
break; N'EZJoH
SortUtil.swap(queue,j,k); U-1UWq
k = j; !fn%Q'S
} +39uKOrZ
} zM&ro,W
private void fixUp(int k) { :AztHf?X
while (k > 1) { rY^uOrR>j*
int j = k >> 1; w$f_z*/
if (queue[j]>queue[k]) HSG Ln906
break; H6 x
SortUtil.swap(queue,j,k); T&pCLvkz
k = j; W)Y`8&,
} aXVldt'
} WcKDerc
qX-5/;n
} Ah7"qv'L\
~//9Nz~;3
} l%GArH`
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SortUtil： aQx6;PC
-%fj-Y7y
package org.rut.util.algorithm; ]ASw%Lw)
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import org.rut.util.algorithm.support.BubbleSort; W1"NKg~4
import org.rut.util.algorithm.support.HeapSort; ff.k1%wr^
import org.rut.util.algorithm.support.ImprovedMergeSort; er3~gm
import org.rut.util.algorithm.support.ImprovedQuickSort; ^lV}![do!
import org.rut.util.algorithm.support.InsertSort; V>)/z|[
import org.rut.util.algorithm.support.MergeSort; MSM8wYcD
import org.rut.util.algorithm.support.QuickSort; B;=Z^$%T
import org.rut.util.algorithm.support.SelectionSort; }a5TY("d9H
import org.rut.util.algorithm.support.ShellSort; *'8q?R?7g
dNt^lx
/** vkGF_aenk
* @author treeroot |wuTw|
* @since 2006-2-2 A)n_ST0
* @version 1.0 LZ_VLW9wE
*/ ,S`n?.&& 7
public class SortUtil { 5O]tkHYR
public final static int INSERT = 1; p )JR5z
public final static int BUBBLE = 2; |Sjy
public final static int SELECTION = 3; SQK82/
public final static int SHELL = 4; 8ly)G
public final static int QUICK = 5; K(upzn*a
public final static int IMPROVED_QUICK = 6; us|Hb
public final static int MERGE = 7; 1DcBF@3sWG
public final static int IMPROVED_MERGE = 8; >^g2Tg:
public final static int HEAP = 9; QEt"T7a[/
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public static void sort(int[] data) { UwS7B~
sort(data, IMPROVED_QUICK); )GG9[%H!
} xgIb6<qwY
private static String[] name={ aIa<,
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" =L#&`s@)_
}; tP! %(+V
5Q8 H8!^
private static Sort[] impl=new Sort[]{ +fboTsp% H
new InsertSort(), M}11 tUl
new BubbleSort(), |A*4Fuc&
new SelectionSort(), 7=?!B#hm!
new ShellSort(), G5U?]& I8
new QuickSort(), qtAt=` s
new ImprovedQuickSort(), --l UEo~
new MergeSort(), vJ&D>Vh4e
new ImprovedMergeSort(), ^\B4]'+^j
new HeapSort() G9okl9;od
}; c;q=$MO`
(,o@/ -o
public static String toString(int algorithm){ l([aKm#
return name[algorithm-1]; D )`(b
} &\6},JN
-( p%+`
public static void sort(int[] data, int algorithm) { gkxHfm
impl[algorithm-1].sort(data); *l =f=
} \f4rA?+f
4bL *7bA
public static interface Sort { *\'t$se+
public void sort(int[] data); T$u'+* Xx
} 9rz$c, Y(
'q:7PkN!p
public static void swap(int[] data, int i, int j) { LRu*%3xx
int temp = data; /YZMP'v
data = data[j]; ;[ Dxk$"
data[j] = temp; iQ Xlz]'
} Yn [ F:Z
} {c3FJ5: