[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; oC;l5v<
} SvCK;$:
int i1=l; w2RESpi
int i2=mid+1; 9^=t@
for(int cur=l;cur<=r;cur++){ M?:f^
if(i1==mid+1) vs)HbQ
data[cur]=temp[i2++]; (>kBmK1Aj
else if(i2>r) '3Y0D1`v
data[cur]=temp[i1++]; 'bQs_
else if(temp[i1] data[cur]=temp[i1++]; ;nHo%`Zt
else -6*OF.Ag`
data[cur]=temp[i2++]; 8M5!5Jzv
} J_)z:`[yE
} !S$oaCxM
Ve')LY<
} M2;(+8 b
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改进后的归并排序: ) J:'5hz
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package org.rut.util.algorithm.support; )x5$io
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import org.rut.util.algorithm.SortUtil; lMI ix0sSj
cC(ubUR
/** B "s8i{Vm
* @author treeroot "|~B};|MFF
* @since 2006-2-2 EZa{C}NQ$2
* @version 1.0 QL|:(QM
*/ E|6Z]6[
public class ImprovedMergeSort implements SortUtil.Sort { kcZ;SYosj
-qnXa
private static final int THRESHOLD = 10; 71.:p,Z@z
IQIb\OUo!v
/* ,nuDoc
* (non-Javadoc) Z-;uzx
* 5)o-]S>
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) [F9KC^%S
*/ McMK|_H
public void sort(int[] data) { _<' kzOj
int[] temp=new int[data.length]; Vzv.e6_
mergeSort(data,temp,0,data.length-1); He$mu=$q{
} n3@g{4~
[laL6
private void mergeSort(int[] data, int[] temp, int l, int r) { WRU@i;l
int i, j, k; MjF.>4
int mid = (l + r) / 2; 1rzq$,O
if (l == r) h-v&I>
return; )Q pP1[
if ((mid - l) >= THRESHOLD) ,uD*FSp>
mergeSort(data, temp, l, mid); N#6A>
else {Z{NH:^
insertSort(data, l, mid - l + 1); j~0ZE -e
if ((r - mid) > THRESHOLD) N<i Vs
mergeSort(data, temp, mid + 1, r); 7=ga_2
else PXQ9P<m
insertSort(data, mid + 1, r - mid); ez<wEtS
SO jDtZ
for (i = l; i <= mid; i++) { 2b&;Y/z
temp = data; keq[6Lv
} mWFZg.#?
for (j = 1; j <= r - mid; j++) { .$x[!fuuR&
temp[r - j + 1] = data[j + mid]; (Vv[
} `?|]:7'<
int a = temp[l]; ,Vn]Ft?n
int b = temp[r]; ~v,KI["o
for (i = l, j = r, k = l; k <= r; k++) { a0j.\g
if (a < b) { {q>4:lsS
data[k] = temp[i++]; q,>F#A'
a = temp; F'_8pD7
} else { tMk>Bx9[
data[k] = temp[j--]; u9^;~i,
b = temp[j]; [/,6O
} jN[6JY1
} - 5Wt9
} 5J#gJFA
?m7"G)
/** *A9{H>Vq
* @param data $YQ&\[pDA
* @param l ok_{8z\#
* @param i Zdg{{|mm
*/ 9i[2z:4HJ
private void insertSort(int[] data, int start, int len) { !eoec2h#5
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); KKXb,/
} Ln%_8yth
} hGHzO
} m95$V&
} G[-jZ
Q+M3Pqy
堆排序： &Gwh<%=U
KgAX0dM
package org.rut.util.algorithm.support; E1v<-UPbA
@Iatlz*W
import org.rut.util.algorithm.SortUtil; 07Cuoqt2
J+|V[E<x
/** K'/x9.'%
* @author treeroot .7rsbZzs
* @since 2006-2-2 rzj'!~>U
* @version 1.0 Q>*K/%KD
*/ L%s""nP
public class HeapSort implements SortUtil.Sort{ !K)|e4$
Bq8<FZr#!
/* (non-Javadoc) 3yX^R^`
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 1vd+p!n
*/ eajL[W^>
public void sort(int[] data) { qz2d'OhmtH
MaxHeap h=new MaxHeap(); u[qtuM?&
h.init(data); V-u\TiL
for(int i=0;i h.remove(); &bx,6dX
System.arraycopy(h.queue,1,data,0,data.length); ;<rJ,X#
} 4"=pcHNV
`Yve
private static class MaxHeap{ C@W0fz
[0@i,7{ZqE
void init(int[] data){ qeGOSGc_
this.queue=new int[data.length+1]; (<-0UR]%q;
for(int i=0;i queue[++size]=data; M#|xj <p
fixUp(size); 0CYI,V
} [%q":Ig
} @#">~P|Hp
Hc!_o`[{l
private int size=0; .YbD.{]D
_JoA=<O!
private int[] queue; b5C #xxIO
JH9CN
public int get() { lPP7w`[PA
return queue[1]; o*VQH`G*|g
} .kV/0!q?
J{I?t~u
public void remove() { xRmB?kM3]5
SortUtil.swap(queue,1,size--); fN;y\!q5
fixDown(1); " 8v
} NU"X*g-x^
file://fixdown xNU}uW>>T
private void fixDown(int k) { Rlu;l
int j; U6"50G~u
while ((j = k << 1) <= size) { _1QNO#X
if (j < size %26amp;%26amp; queue[j] j++; >FO=ioNY
if (queue[k]>queue[j]) file://不用交换 :mL.Y em*'
break; IAQ=d4V&
SortUtil.swap(queue,j,k); S]+}Zyg
k = j; M_DkjuR
} 54-x 14")
} Gl(,%~F9i
private void fixUp(int k) { ?g2K&
while (k > 1) { +=v|kd
int j = k >> 1; A2 rRYzN;
if (queue[j]>queue[k]) B _ >|Mo/
break; l!2.)F`x
SortUtil.swap(queue,j,k); TDFv\y}yc
k = j; y!].l0e2a
} 7}MWmS^8j
} oUH\SW8?
6$Y1[
} E2l.
08Gr
} ?Z"}RMM)8
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SortUtil： GU9`;/
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package org.rut.util.algorithm; 0nX5 $Kn
%"tf`,d~3
import org.rut.util.algorithm.support.BubbleSort; gxiJ`.D=
import org.rut.util.algorithm.support.HeapSort; sz5@=
import org.rut.util.algorithm.support.ImprovedMergeSort; v%r!}s
import org.rut.util.algorithm.support.ImprovedQuickSort; f/xBR"'
import org.rut.util.algorithm.support.InsertSort; |?8wyP
import org.rut.util.algorithm.support.MergeSort; Oc1ZIIkh\
import org.rut.util.algorithm.support.QuickSort; BC^WPr
import org.rut.util.algorithm.support.SelectionSort; lsd\ `X5,
import org.rut.util.algorithm.support.ShellSort; (s*}=
d)@MMF
/** i*3_ivc)
* @author treeroot Ek:u[Uw\
* @since 2006-2-2 /V^S)5r
* @version 1.0 tpS F[W
*/ BFY~::<b
public class SortUtil { R_csKj
public final static int INSERT = 1; 4)?c[aC4P
public final static int BUBBLE = 2; 'W)x<Iey1
public final static int SELECTION = 3; QJ QQ-
public final static int SHELL = 4; yq2Bz7P
public final static int QUICK = 5; Nt)9-\T
public final static int IMPROVED_QUICK = 6; a v/=x
public final static int MERGE = 7; ie)Qsw@
public final static int IMPROVED_MERGE = 8; 1FuChd
public final static int HEAP = 9; CBc}N(9
p"ZPv~("V
public static void sort(int[] data) { d7@ N~<n
sort(data, IMPROVED_QUICK); PO#FtG
} FU<rE&X2:
private static String[] name={ }k%>%xQ.
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" }rN"H4)
}; _=rXaTp
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private static Sort[] impl=new Sort[]{ Ofn:<d
new InsertSort(), L^22,B 0
new BubbleSort(), p47~vgJN
new SelectionSort(), $>+-=XMVB
new ShellSort(), ;9rQN3J$gn
new QuickSort(), k[][Md2Vh
new ImprovedQuickSort(), g&"Nr aQM9
new MergeSort(), TYp{nWwi
new ImprovedMergeSort(), g wk\[I`;
new HeapSort() *J6qL! ["
}; V[%r5!83H
0pu'K)Rb
public static String toString(int algorithm){ :]x)lP(3E
return name[algorithm-1]; dX<UruPA
} (7"qT^s3
i"r=b%;;
public static void sort(int[] data, int algorithm) { 7+ c?eH
impl[algorithm-1].sort(data); G|o-C:~
} &" b0`&l
Lbd_L
public static interface Sort { 0FXM4YcrJO
public void sort(int[] data); 8F%TZM
} M 3^p,[9r#
g?`w)O7v
public static void swap(int[] data, int i, int j) { !0cfz5t
int temp = data; Kl^Yq
data = data[j]; s4w<X}O_
data[j] = temp; Q_ $AGF
} Ros5]5=dP
} :yv! x