[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; ]>@; 2%YvY
} l;>#O
int i1=l; {+[~;ISL
int i2=mid+1; %+$P<Rw7
for(int cur=l;cur<=r;cur++){ RIX0AE
if(i1==mid+1) iUh_rX9A"
data[cur]=temp[i2++]; 96F:%|yG
else if(i2>r) @18@[ :d"
data[cur]=temp[i1++]; xM%E;
else if(temp[i1] data[cur]=temp[i1++]; {xt<`_R
else yy?|q0
data[cur]=temp[i2++]; ] K7>R0
} ?Gl'-tV
} EU,4qO
6<H[1PI`,G
} e4NT
8QYG"CA6/
改进后的归并排序: sTqy-^e7
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package org.rut.util.algorithm.support; ~nb%w?vv
bWv6gOPR3
import org.rut.util.algorithm.SortUtil; PKC``+Ki
/#$bb4
/** !U]V?Jpi"
* @author treeroot $XFG1?L!
* @since 2006-2-2 #I@]8U#,":
* @version 1.0 5fb,-`m.
*/ 8{Y ?;~G
public class ImprovedMergeSort implements SortUtil.Sort { &RXd1>|c2
y{ 90A
private static final int THRESHOLD = 10; c}mJ6Pt
:LVM'c62c>
/* &+`l $h
* (non-Javadoc) oO @6c%
* 'KQ]7
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) W<2%J)N<
*/ MV$>|^'em
public void sort(int[] data) { #`a-b<uz
int[] temp=new int[data.length]; UVu"meZX
mergeSort(data,temp,0,data.length-1); |dD!@K
} -/
.Z&OKWL
private void mergeSort(int[] data, int[] temp, int l, int r) { [ H>MeeR
int i, j, k; |f8by\Q86=
int mid = (l + r) / 2; |]A{8BBC
if (l == r) 0P/A
return; w0SzK-&
if ((mid - l) >= THRESHOLD) YO!,m<b^u
mergeSort(data, temp, l, mid); = k3O4gE7
else q~trn'X>
insertSort(data, l, mid - l + 1); |!%A1 wp#
if ((r - mid) > THRESHOLD) *U54x /w|
mergeSort(data, temp, mid + 1, r); W~k!qy `
else [&nwB!kt
insertSort(data, mid + 1, r - mid); U]R?O5K
8tA.d.8
for (i = l; i <= mid; i++) { wt2S[:!p
temp = data; 3N+P~v)T'
} /F;*[JZIb
for (j = 1; j <= r - mid; j++) { =La}^
temp[r - j + 1] = data[j + mid]; 9b]U&A$
} eiEZtu
int a = temp[l]; F:pXdU-xf
int b = temp[r]; 6xL=JSi~
for (i = l, j = r, k = l; k <= r; k++) { 0y;&L63>T
if (a < b) { #j-,#P@
data[k] = temp[i++]; g#[9O'H
a = temp; {]<D"x;
} else { YGWb!|Z$
data[k] = temp[j--]; 3jS=
b = temp[j]; <Dm6CH
} +{hxEDz
} y^@%Xrs
} 5.?O PK6
Y ga}8DU
/** tEN]0`
* @param data mApn(&
* @param l x(]s#D!)
* @param i ~;eWQwD
*/ ,xD{A}}V
private void insertSort(int[] data, int start, int len) { jLQjv
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); e_1mO 5z
} 1 9 k$)m
} n[4Nu`E9
} CPVKz
} c6c^9*,V
''5%5(Y.r
堆排序： ~Y'e1w$`
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package org.rut.util.algorithm.support; ~|uCZ.;o
w|L~+
import org.rut.util.algorithm.SortUtil; !'{j"tv
rB4#}+Uq
/** .qK=lHxT
* @author treeroot 3~cOQ%#]4
* @since 2006-2-2 ,j_{IL690
* @version 1.0 &us8,x6yg
*/ _5`M( ;hL2
public class HeapSort implements SortUtil.Sort{ K&)a3Z=(.
zl: u@!'
/* (non-Javadoc) izC>-
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) LpmspIPvf
*/ 9d{W/t?NH
public void sort(int[] data) { =k$d8g ez
MaxHeap h=new MaxHeap(); Q%eBm_r;
h.init(data); tjd"05"@:
for(int i=0;i h.remove(); vj^UF(X
System.arraycopy(h.queue,1,data,0,data.length); ZH0f32K
} N!h>fE`
N"T8 Pt
private static class MaxHeap{ Q?"[zX1
/6q/`vx@
void init(int[] data){ E`?BaCrG~
this.queue=new int[data.length+1]; D~?kvyJ
for(int i=0;i queue[++size]=data; %I.{umU
fixUp(size); -:~`g*3#
} `PW=_f={
} he+[
9Np0<e3p
private int size=0; |wLQ)y*
cbwzT0
private int[] queue; *$cp"
:jUuw:\
public int get() { YAPD7hA
return queue[1]; /GXO2zO
} 9{TOFjsF
ReE3742@
public void remove() { 3?%kawO&
SortUtil.swap(queue,1,size--); O,>&w5
fixDown(1); ks r5P~
} ,Tz ,)rY
file://fixdown 7S1!|*/ I
private void fixDown(int k) { Dw#&x/G
int j; e{}o:r
while ((j = k << 1) <= size) { 8 6+>|
if (j < size %26amp;%26amp; queue[j] j++; DA wzXsx
if (queue[k]>queue[j]) file://不用交换 (mD]}{>
break; SW; bE
SortUtil.swap(queue,j,k); ]rNfr-
k = j; +[qkG. O
} L_.}z)S[\
} u!-eP7;7
private void fixUp(int k) { 0*AlLwO
while (k > 1) { ua[\npz5
int j = k >> 1; V8sY7QK=
if (queue[j]>queue[k]) }O>Zu[8a
break; ;VuB8cnL`
SortUtil.swap(queue,j,k); os.x|R]_
k = j; CC09:L?
} eLTNnz
} YiJu48J
Q&#:M>!|
} (s3%1OC[
BdKtpje
} FO5SXwx
yJL"uleRT
SortUtil： Y{yr-E #~M
2G-? P"4l@
package org.rut.util.algorithm; sXa8(xc
64vSJx>u
import org.rut.util.algorithm.support.BubbleSort; yTn@p(J
import org.rut.util.algorithm.support.HeapSort; b910Z?B^L
import org.rut.util.algorithm.support.ImprovedMergeSort; bpx=&74,6m
import org.rut.util.algorithm.support.ImprovedQuickSort; KCT8Q!\
import org.rut.util.algorithm.support.InsertSort; G;m"ao"2
import org.rut.util.algorithm.support.MergeSort; ul%bo%&~
import org.rut.util.algorithm.support.QuickSort; @j (jOe
import org.rut.util.algorithm.support.SelectionSort; :kVV.a#g
import org.rut.util.algorithm.support.ShellSort; LC7LO
&wuV}S7
/** %aKkk)s
* @author treeroot "qsNySI
* @since 2006-2-2 {_~G+rqY
* @version 1.0 GWVdNYpmr
*/ d!t@A
public class SortUtil { (FaT{W{
public final static int INSERT = 1; H_j<%VW
public final static int BUBBLE = 2; _+N^yw,r*
public final static int SELECTION = 3; 9y5\4&v
public final static int SHELL = 4; ]xG8vy
public final static int QUICK = 5; yq}{6IyZ^
public final static int IMPROVED_QUICK = 6; RI(uG-Y
public final static int MERGE = 7; ~ YK<T+
public final static int IMPROVED_MERGE = 8; `Z/IW
public final static int HEAP = 9; 9CNHjs+-}s
K_5&_P1
public static void sort(int[] data) { IebS~N E
sort(data, IMPROVED_QUICK); 5);#\&B
} JqUVGEg
private static String[] name={ e%U*~{m+
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" .vv*bx
}; x/7G0K2\}
752wK|o0|;
private static Sort[] impl=new Sort[]{ vdm?d/0(^
new InsertSort(), ]~^/w}(K
new BubbleSort(), is(!_Iv
new SelectionSort(), \uk#pL
new ShellSort(), 9^^#I~-
new QuickSort(), W~%~^2g ;k
new ImprovedQuickSort(), 5u46Vl{
new MergeSort(), qX(%Wn;n
new ImprovedMergeSort(), o x^lI
new HeapSort() aAri
}; /;rN/ot2o
\V>%yl{8
public static String toString(int algorithm){ 2eU[*x
return name[algorithm-1]; f}X8|GlBo
} m-89nOls
6p"c^
public static void sort(int[] data, int algorithm) { hU 7fZl%yl
impl[algorithm-1].sort(data); ]M(mq`K
} N%f!B"NQ
nvPE N
public static interface Sort { D-GU"^-9
public void sort(int[] data); `#rfp 9w
} /6?plt&CA
y!gM)9vq
public static void swap(int[] data, int i, int j) { j7 =3\SO
int temp = data; Qu,k
data = data[j]; @MB _gt)7?
data[j] = temp; 4Aew )
} 0Qp'}_
} ,)$KS*f"*z