[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; zf@gAvJ
} 7Hghn"ol
int i1=l; "gm[q."n<
int i2=mid+1; ~0}gRpMW
for(int cur=l;cur<=r;cur++){ i!H)@4jX
if(i1==mid+1) (HNxo{t
data[cur]=temp[i2++]; ?hqHTH:PU
else if(i2>r) RJpH1XQ j
data[cur]=temp[i1++]; O$Wi=5
else if(temp[i1] data[cur]=temp[i1++]; 1u?h4wC
else "I[a]T}/
data[cur]=temp[i2++]; 9q +I
} @DiXe[kI
} J1i{n7f=@
t)#8r,9c
} f`ro{p
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改进后的归并排序: w %4SNR
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package org.rut.util.algorithm.support; gYeKeW3)
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import org.rut.util.algorithm.SortUtil; ]!7%)
?]*WVjskE
/** F52%og~N
* @author treeroot zD#$]?@ b
* @since 2006-2-2 k|C~qe3E
* @version 1.0 icO$9c
*/ bQU{)W
public class ImprovedMergeSort implements SortUtil.Sort { |PGF g0li
1NHiW v
private static final int THRESHOLD = 10; &zuPt5G|
j,DF' h
/* #Hn<4g"AjM
* (non-Javadoc) <WXGDCj
* NCW<~
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 968<yO]
*/ ///
public void sort(int[] data) { C bWz;$r
int[] temp=new int[data.length]; {Ad4H[]|]
mergeSort(data,temp,0,data.length-1); gmdJ8$
} Sb2hM~
^T?zR7r
private void mergeSort(int[] data, int[] temp, int l, int r) { KT5amct
int i, j, k; _xKIp>A
int mid = (l + r) / 2; OD@k9I[
if (l == r) U46qpb7
return; 2 m"2>gX
if ((mid - l) >= THRESHOLD) ;mT|0&o>#
mergeSort(data, temp, l, mid); kM:Z(Z7$
else 'E\/H17
insertSort(data, l, mid - l + 1); .Us)YVbk
if ((r - mid) > THRESHOLD) HZINsIm!?
mergeSort(data, temp, mid + 1, r); -_*ux!
else 0W_olnZ
insertSort(data, mid + 1, r - mid); 2XX-
]\~s83?X
for (i = l; i <= mid; i++) { (vR9vOpJ
temp = data; r\PO?1
} ZVelKI8>
for (j = 1; j <= r - mid; j++) { ABx< Ep6
temp[r - j + 1] = data[j + mid]; ojc m%yd
} n-"(lWcp
int a = temp[l]; >PYLk{q
int b = temp[r]; 1bz%O2U-(
for (i = l, j = r, k = l; k <= r; k++) { qjBF]3%t%
if (a < b) { Wg!<V6}
data[k] = temp[i++]; c-`'`L^J
a = temp; ?[Sac]h ys
} else { 0~a9gBG
data[k] = temp[j--]; 009[`Z
b = temp[j]; XRl!~Y|
} r,43 gg
} 0hNgr'
} T'ko =k
BvnNAi
/** ;L*Ku'6Mt
* @param data +$uQ_ve
* @param l >Ut4INV
* @param i )%+7"7.
*/ #\zC|%2+z
private void insertSort(int[] data, int start, int len) { }'KHF0
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); vE~>9
} #+"1">l
} |F}6Zv
} o?{-K-'B$
} [g/ &%n0^
1zcaI^e#
堆排序： B>;`$-
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package org.rut.util.algorithm.support; .),Fdrg
1!S*z^LGl
import org.rut.util.algorithm.SortUtil; .A Dik}o
*^3&Y@
/** JBI>D1`"
* @author treeroot ^XgBkC~
* @since 2006-2-2 gcA,u)z}R
* @version 1.0 "d; T1
*/ 9Ai3p
public class HeapSort implements SortUtil.Sort{ CcJ%;.V,T
I3.cy i
/* (non-Javadoc) d)WGI RUx
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Ajm
*/ oypF0?!m
public void sort(int[] data) { NZu2D
MaxHeap h=new MaxHeap(); H3xMoSs
h.init(data); u2E}DhV
for(int i=0;i h.remove(); vWH)W?2
System.arraycopy(h.queue,1,data,0,data.length); W^,(we
} ,%T sfB
4[lym,8C
private static class MaxHeap{ Xk(p:^ R
YlC$L$%Zd.
void init(int[] data){ :^En\YcU
this.queue=new int[data.length+1]; [*K.9}+G_
for(int i=0;i queue[++size]=data; =c;.cW
fixUp(size); Ln$= 8x^T
} +C36OcmT~
} gSk0#Jt
zq'KX/o
private int size=0; h:=W`(n5u
{+^&7JX
private int[] queue; Rn$TYCO
L2Fi/UWM
public int get() { (:>Sh0.
return queue[1]; B%I<6E[D
} z7s}-w,
j a'_syn
public void remove() { |/%X8\
SortUtil.swap(queue,1,size--); E#~J"9k98
fixDown(1); Ly-}HW(
} AIG5a$}&
file://fixdown PVi0|
private void fixDown(int k) { qQwf#&
int j; }vEMG-sxX
while ((j = k << 1) <= size) { S=a>rnF
if (j < size %26amp;%26amp; queue[j] j++; >aAsUL5W
if (queue[k]>queue[j]) file://不用交换 \'6%Ld5km
break; 9>6?tb"f*H
SortUtil.swap(queue,j,k); ?$6(@>`f&t
k = j; aeE~[m
} i<M F8$
} YJF|J2u
private void fixUp(int k) { .k"unclT0
while (k > 1) { ,: Ij@u>)
int j = k >> 1; 6Zx)L|B
if (queue[j]>queue[k]) 97pfMk1_
break; f<;eNN
SortUtil.swap(queue,j,k); Oh3A?!y#
k = j; x3l~kZ(
} qm6X5T
} ";Q}Gs}
4vi[hiV
} C ~Doj
' 7H"ezt
} /pWKV>tjj
h,ipQ>
SortUtil： &<EixDi4q
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package org.rut.util.algorithm; 07G'"=
?h:xO\h8
import org.rut.util.algorithm.support.BubbleSort; |~B`[p]5H
import org.rut.util.algorithm.support.HeapSort; hz+c]K
import org.rut.util.algorithm.support.ImprovedMergeSort; Z=beki]
import org.rut.util.algorithm.support.ImprovedQuickSort; =J`M}BBx
import org.rut.util.algorithm.support.InsertSort; `h~-
import org.rut.util.algorithm.support.MergeSort; *{(tg~2'(
import org.rut.util.algorithm.support.QuickSort; 1Q7]1fRu
import org.rut.util.algorithm.support.SelectionSort; 0*,]`A=
import org.rut.util.algorithm.support.ShellSort; $"g'C8
M7=|N:/_
/** o|APsQE
* @author treeroot ;)Sf|
* @since 2006-2-2 #s{EIj~YR_
* @version 1.0 K(AZD&D
*/ Z3f}'vr
public class SortUtil { dN@C)5pm5`
public final static int INSERT = 1; UHS"{%
public final static int BUBBLE = 2; {$I1(DYN
public final static int SELECTION = 3; <m> m"|G
public final static int SHELL = 4; ! u9LZ
public final static int QUICK = 5; h\4enu9[RL
public final static int IMPROVED_QUICK = 6; 8M,$|\U
public final static int MERGE = 7; %?BygG
public final static int IMPROVED_MERGE = 8; |#sY(1
public final static int HEAP = 9; yeLd,M/I
S;tvt/\!Z
public static void sort(int[] data) { _FkH;MGWS
sort(data, IMPROVED_QUICK); IM_SZs
} M%OUkcWCk
private static String[] name={ _adW>-wQ!d
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" Y/f8rN
}; Zfd `Fu
v,Z?pYYo
private static Sort[] impl=new Sort[]{ x b!&'cw
new InsertSort(), a28`)17z
new BubbleSort(), %zN~%mJG
new SelectionSort(), ^fP5@T*f
new ShellSort(), ,4r 4 <
new QuickSort(), 7w}]9wCN?
new ImprovedQuickSort(), jEm=A8q
new MergeSort(), juQ?k xOB
new ImprovedMergeSort(), yJdkDVxYr
new HeapSort() h*?]A
}; >$7{H]
,WE2MAjhT
public static String toString(int algorithm){ 1]&{6y
return name[algorithm-1]; 4MoxP
} C8y[B1Y
4!A(7 s4t
public static void sort(int[] data, int algorithm) { 19i=kdH
impl[algorithm-1].sort(data); 4$+/7I \
} R]l2,0:
QtLd(& !v
public static interface Sort { -HRa6
public void sort(int[] data); QzY5S0
} @%8$k[
QC(ce)Y
public static void swap(int[] data, int i, int j) { eC_i]q&o|
int temp = data; oGL2uQXX
data = data[j]; l - ~PX
data[j] = temp; MADt$_
} S_;m+Ytg
} \*Z:w3;r