[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; *uZ'MS
} / , .rUn1
int i1=l; [IW6F
int i2=mid+1; #.~lt8F
for(int cur=l;cur<=r;cur++){ VufG7%S{
if(i1==mid+1) 05vu{>
data[cur]=temp[i2++]; ou'|e"tI
else if(i2>r) U7Pn $l2!
data[cur]=temp[i1++]; 8*yky
else if(temp[i1] data[cur]=temp[i1++]; N!=Q]\ZD
else 5[>N[}Ck>
data[cur]=temp[i2++]; b'yW+
} 2/FH9T;e".
} .aqP=
=J&aN1Hgt
} bR? $a+a)
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改进后的归并排序: uB uwE6
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package org.rut.util.algorithm.support; qy~@cPT
( 0Z3Ksfj1
import org.rut.util.algorithm.SortUtil; G@]|/kN1y
O(f&0h !
/** cdsF<tpy
* @author treeroot t%>x}b"2T
* @since 2006-2-2 U})Z4>[bvt
* @version 1.0 o[CjRQY]P
*/ I~I$/j]e`
public class ImprovedMergeSort implements SortUtil.Sort { O\qY?)
<\5Y~!)
private static final int THRESHOLD = 10; \%:]o-+"I
t>>\U X
/* +S>}<OE
* (non-Javadoc) (Qys`D
* }X*.Vv A
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) <E&"]
*/ k34!*(`q
public void sort(int[] data) { qfzT8-Y
int[] temp=new int[data.length]; M4TFWOC1
mergeSort(data,temp,0,data.length-1); W&(98}oT
} `` mi9E
Ayi Uz
private void mergeSort(int[] data, int[] temp, int l, int r) { az ?2
int i, j, k; $C !Mk
int mid = (l + r) / 2; Eq?d+s>
if (l == r) #5.L%F
return; :,(ZMx\
if ((mid - l) >= THRESHOLD) M.R]hI
mergeSort(data, temp, l, mid); N%&D(_
else )CCrO
insertSort(data, l, mid - l + 1); V2?&3Z)W
if ((r - mid) > THRESHOLD) -"e$ VB
mergeSort(data, temp, mid + 1, r); 13T0"}
else A/"p PO
insertSort(data, mid + 1, r - mid); nob^ I5?
[,fdNxc8
for (i = l; i <= mid; i++) { &$</|F)y
temp = data; 5U/1Z{
} J]|lCwF
for (j = 1; j <= r - mid; j++) { \dag~b<
temp[r - j + 1] = data[j + mid]; <\cH9D`dE
} Z"fnjH
int a = temp[l]; |E)IJj 3
int b = temp[r]; 2<@27C5
for (i = l, j = r, k = l; k <= r; k++) { s GP}>w-JZ
if (a < b) { 1y5$
data[k] = temp[i++]; h}_1cev?
a = temp; B:\TvWbu
} else { /8` S}g+
data[k] = temp[j--]; |<ZkJR3B
b = temp[j]; grhwPnKl
} 21BlLz
} ,\K1cW~U5
} /U%Xs}A)
S qQqG3F
/** txwTJScg
* @param data VoJelyzh
* @param l <IBzh_
* @param i 9GZKT{*
*/ 1=t\|Th-
private void insertSort(int[] data, int start, int len) { ZkJYPXdn?
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); jF\J+:5M
} I!;#Nk>
} ,e ~@
} yv<0fQ
} o2ndnIL
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堆排序： Vhww-A
}hFjl4`xa
package org.rut.util.algorithm.support; 2Ax HhD.
Dn?P~%
import org.rut.util.algorithm.SortUtil; $W8
G1"=}Wt`
/** ~qiSkG
* @author treeroot F62arDA
* @since 2006-2-2 S{NfU/: dL
* @version 1.0 w%1B_PyDg
*/ X~Li`
public class HeapSort implements SortUtil.Sort{ 1lNg} !)[K
T@]vjXd![
/* (non-Javadoc) (r^IW{IndX
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) /y,~?
*/ g'`J'6Pn
public void sort(int[] data) { )]%GNdU
MaxHeap h=new MaxHeap(); jBEt!Azur
h.init(data); XRI1/2YA
for(int i=0;i h.remove(); kl|KFdA;
System.arraycopy(h.queue,1,data,0,data.length); !o 7uZC\
} E$FXs~a
`oh'rm3'8
private static class MaxHeap{ -NVk>ENL4
T!hU37g h?
void init(int[] data){ gTR:9E:B
this.queue=new int[data.length+1]; NDRk%_Eu(
for(int i=0;i queue[++size]=data; *Df|D/,WE
fixUp(size); Y1 i!
} i)0*J?l=
} 'PlKCn`(w
nYuZg6K
private int size=0; ~`{HWmah
mLO{~ruu
private int[] queue; IrXC/?^h
eN%Ks
public int get() { Y:VM5r)
return queue[1]; I/GZ
} %f@VOSs
&,fBg6A%
public void remove() { Z$,1Tk"O/s
SortUtil.swap(queue,1,size--); doxQS ohS
fixDown(1); 8jjJ/Mz`
} -{ZTp8P>
file://fixdown AdB5D_ Ir
private void fixDown(int k) { .l*]W!L]
int j; j~"X`:=
while ((j = k << 1) <= size) { 6yF4%Sz9
if (j < size %26amp;%26amp; queue[j] j++; "_C^Bc
if (queue[k]>queue[j]) file://不用交换 yi7-[W}
break; nrA}36E
SortUtil.swap(queue,j,k); -)?~5Z
k = j; u9>.x zYG
} "wxs
} 9r7QE&.
private void fixUp(int k) { D|Z,eench
while (k > 1) { vdNh25a<h
int j = k >> 1; HF5aU:M
if (queue[j]>queue[k]) Xig+[2zS
break; 7BF't!-2F
SortUtil.swap(queue,j,k); yaA9*k
k = j; 5in6Y5ckj
} x-U^U.i@
} $;+B)#
q[b-vTzI
} bs]ret$?(q
i<1w*yu
} T{|'<KT
\x x<\8Qr_
SortUtil： 5D]%E?ag
~/\;7E{8!
package org.rut.util.algorithm; *Yvfp{B
89@89-_mC
import org.rut.util.algorithm.support.BubbleSort; 'oEFNC9V
import org.rut.util.algorithm.support.HeapSort; GA6Z{U{XS
import org.rut.util.algorithm.support.ImprovedMergeSort; tB[(o%k
import org.rut.util.algorithm.support.ImprovedQuickSort; d+ih]?
import org.rut.util.algorithm.support.InsertSort; !?ayZ5G([
import org.rut.util.algorithm.support.MergeSort; #joU}Rj|
import org.rut.util.algorithm.support.QuickSort; u3 ?+Hu|*T
import org.rut.util.algorithm.support.SelectionSort; $&k2m^R<
import org.rut.util.algorithm.support.ShellSort; E[htNin.B~
XT= #+
/** 4lb3quY$Us
* @author treeroot rg_-gZl8&z
* @since 2006-2-2 f8N
* @version 1.0 c1CP12
*/ Z5-"a?{Y
public class SortUtil { $}OU~d1q
public final static int INSERT = 1; v<tH 3I+
public final static int BUBBLE = 2; N!"GwH
public final static int SELECTION = 3; KL.{)bi
public final static int SHELL = 4; 0tn5>Dsk
public final static int QUICK = 5; n4k.tq
public final static int IMPROVED_QUICK = 6; m3 (fr
public final static int MERGE = 7; .K}u`v T
public final static int IMPROVED_MERGE = 8; R.|fc5_"+
public final static int HEAP = 9; VuJth
zG@9-s* L
public static void sort(int[] data) { F>n<;<
sort(data, IMPROVED_QUICK); ,Xk8{=
} xHykU;p@
private static String[] name={ V>A@Sw
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" ILF"m;
}; MJV&%E6{:{
xJ>hN@5}i
private static Sort[] impl=new Sort[]{ c2?(.UV
new InsertSort(), 52l|
new BubbleSort(), xYM/{[
new SelectionSort(), ^lRXc.c z
new ShellSort(), x}N+vK
new QuickSort(), %r6~5_A
new ImprovedQuickSort(), ]v94U b
new MergeSort(), WU#bA|Cf
new ImprovedMergeSort(), (rZq0*
new HeapSort() w6R=r n
}; +#1WOQfAD
$./JA)`
public static String toString(int algorithm){ )J~Qx-jG
return name[algorithm-1]; I^M3>}p
} vCbqZdy?
4p>@UB&U
public static void sort(int[] data, int algorithm) { 9Wx q
impl[algorithm-1].sort(data); 5[X^1
} ;5"r)F+P
]ueq&|
public static interface Sort { 8xg:ItJaA0
public void sort(int[] data); )5d&K8@
} +*)B;)P
)V)4N[?GC
public static void swap(int[] data, int i, int j) { (sJ{27b_
int temp = data; _rs!6tp
data = data[j]; A_Sl#e
data[j] = temp; _=q)lt-UY
} }#EiL !Pv
} c4L5"_#`x-