[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; *Dq ++
} |) cJ
int i1=l; 7L:Eg
int i2=mid+1; ,_$J-F?
for(int cur=l;cur<=r;cur++){ ]}Ys4(}
if(i1==mid+1) 7V@r^/`8N
data[cur]=temp[i2++]; &tbAXU5$
else if(i2>r) 6n]jx:CZ,
data[cur]=temp[i1++]; 3O4,LXdA
else if(temp[i1] data[cur]=temp[i1++]; :G98uX t
else Fnk@)1
data[cur]=temp[i2++]; 3 ;"[WOv
} / j "}e_Q
} [< g9jX5
*[i49X&rd
} 5"G-r._
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改进后的归并排序: u,:hT] ~+
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package org.rut.util.algorithm.support; Yx,E5}-
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import org.rut.util.algorithm.SortUtil; ,j{tGj_
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/** E;`^`T40
* @author treeroot ]jI<Js*F
* @since 2006-2-2 G2y1S/
* @version 1.0 +VQD'
*/ :Hb`vH3x
public class ImprovedMergeSort implements SortUtil.Sort { PepR]ym
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private static final int THRESHOLD = 10; gREk,4DAv
'Qg!ww7O
/* g-!
* (non-Javadoc) *@^@7`W
* K:XP;#OsP
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) E_'H=QN c
*/ 7jxx,#I:
public void sort(int[] data) { yMyvX_UNI
int[] temp=new int[data.length]; zICCSF&H
mergeSort(data,temp,0,data.length-1); %MGt3)
} 2[=3-1c
7l/ZRz}1
private void mergeSort(int[] data, int[] temp, int l, int r) { yK&
int i, j, k; Ad,n+%"e
int mid = (l + r) / 2; H)S!%(x4
if (l == r) B#IUSHC
return; hP'4PLK
if ((mid - l) >= THRESHOLD) Tc"J(GWG
mergeSort(data, temp, l, mid); 7vRp<
else a-S tOO5s
insertSort(data, l, mid - l + 1); IIT[^_g
if ((r - mid) > THRESHOLD) 6`6 / 2C$%
mergeSort(data, temp, mid + 1, r); NNr6~m)3v
else !U}2YM J
insertSort(data, mid + 1, r - mid); f34/whD65
(f_YgQEL
for (i = l; i <= mid; i++) { | @ ut/
temp = data; [aA@V0l
} fwA8=oSZd
for (j = 1; j <= r - mid; j++) { #^]vhnbN
temp[r - j + 1] = data[j + mid]; _OjZ>j<B.
} .Mb0++% W
int a = temp[l]; 7BINqVS&
int b = temp[r]; F7j/Zuj
for (i = l, j = r, k = l; k <= r; k++) { tw.GBR
if (a < b) { *aS+XnT/
data[k] = temp[i++]; jTg~]PQ^
a = temp; 5_](N$$
} else { 8!.V`|@lt
data[k] = temp[j--]; |By[ev"Kh%
b = temp[j]; %,~\,+NP
} $mAC8a_Zu
} iFI+W<QR
} f@Jrbg
?M|1'`!c8
/** {irc~||4
* @param data &b^~0Z
* @param l l"+8>Mm
* @param i >`WfY(Lq
*/ R@pY+d9qp
private void insertSort(int[] data, int start, int len) { <'UGYY\wg0
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); {PxFG<^U
} J;^PM:6
} +XO\#$o>W
} z k}AGw
} j%y{d(Q4
ZB)R4
堆排序： L~;(M6Jp
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package org.rut.util.algorithm.support; &)+H''JY
JN9>nC!Zy_
import org.rut.util.algorithm.SortUtil; ^vT!24sK
1,) yEeHjU
/** 8TAJ#Lm
* @author treeroot <B0f
* @since 2006-2-2 Xj{fM\,"9
* @version 1.0 3+uL@LXd
*/ *-Yw%uR
public class HeapSort implements SortUtil.Sort{ T_D] rMl
.1;UEb|T
/* (non-Javadoc) pw4^E|X
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) itirh"[
*/ ,>b>I#{
public void sort(int[] data) { *IWW,@0
MaxHeap h=new MaxHeap(); WG6 0
h.init(data); 2YKa <?_
for(int i=0;i h.remove(); &qdhxc4
System.arraycopy(h.queue,1,data,0,data.length); g6lWc@]F
} AnX<\7bc}
ZfqN4
private static class MaxHeap{ 6MY<6t0a
Y2 J-`o$5
void init(int[] data){ @>VVB{1@,]
this.queue=new int[data.length+1]; jy2gR1~
for(int i=0;i queue[++size]=data; pk.\IKlG]
fixUp(size); ^5Lk}<utw
} n6WKk+
} 8aWEl%
mrnPZf i
private int size=0; 1F5KDWtE
[H<TcT8
private int[] queue; /QyKXg6)l
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public int get() { /<8y>
return queue[1]; HrsG^x
} #L+:MA7H
h,m 90Hd+
public void remove() { r <5}& B`
SortUtil.swap(queue,1,size--); 1VM2CgRa
fixDown(1); C[ mTVxd
} KsOWTq"uj
file://fixdown JL1A3G
private void fixDown(int k) { JJtx `@Bc
int j; yTd8)zWq
while ((j = k << 1) <= size) { L0!CHP/nRS
if (j < size %26amp;%26amp; queue[j] j++; }}tbOD)t
if (queue[k]>queue[j]) file://不用交换 < z2wt
break; A)C)5W
SortUtil.swap(queue,j,k); @lE'D":?
k = j; / }$n_N\!)
} |0=UZK7%O
} +K'Hr:(
private void fixUp(int k) { ZzupK^5Z
while (k > 1) { ySmbX
int j = k >> 1; .nrllVG%`
if (queue[j]>queue[k]) 3)W zX
break; h5@GeYda
SortUtil.swap(queue,j,k); gd*Gn"
k = j; b@;Wh-{d
} [TFJb+N&
} X^ Is-[OvE
V9v20iX
} XhM!pSl\
pzz*>Y
} 87 s*lS
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SortUtil： v wEbGx
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package org.rut.util.algorithm; qt~=47<d
:HO5 T
import org.rut.util.algorithm.support.BubbleSort; z2uL[deN'"
import org.rut.util.algorithm.support.HeapSort; /!?LBtqy
import org.rut.util.algorithm.support.ImprovedMergeSort; ZKrLp8l\
import org.rut.util.algorithm.support.ImprovedQuickSort; -U=Ci
import org.rut.util.algorithm.support.InsertSort; a9.yuSzL
import org.rut.util.algorithm.support.MergeSort; _rwJ:r
import org.rut.util.algorithm.support.QuickSort; aaFT
import org.rut.util.algorithm.support.SelectionSort; ;Nj9,Va(t
import org.rut.util.algorithm.support.ShellSort; aE`d[dSG
+GI906K
/** Q< :RLKVT
* @author treeroot V9<`?[Usv
* @since 2006-2-2 3O/#^~\'hW
* @version 1.0 l&qnqmW<
*/ y'K2#Y~1e
public class SortUtil { r\;fyeH
public final static int INSERT = 1; :D)(3U5
public final static int BUBBLE = 2; xmvE*q"9]
public final static int SELECTION = 3; x)~i`$
public final static int SHELL = 4; {p84fR1P
public final static int QUICK = 5; wu)+n\mt'
public final static int IMPROVED_QUICK = 6; EsMX#1>/m
public final static int MERGE = 7; -BSdrP|
public final static int IMPROVED_MERGE = 8; Oo|PZ_P
public final static int HEAP = 9; Ur(R[*2bx
r0XEB,}
public static void sort(int[] data) { 2jFuF71
sort(data, IMPROVED_QUICK); u S1O-Q>
} W[\6h Zv
private static String[] name={ G@k]rwub
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" Dw%'u'HG
}; 43PLURay
u=.8M`FxP
private static Sort[] impl=new Sort[]{ "B_3<RSL
new InsertSort(), ef7{D P
new BubbleSort(), x=oV!x
new SelectionSort(), 0ra'H/>Ly
new ShellSort(), gw]%: WeH
new QuickSort(), ;miif
new ImprovedQuickSort(), Q\N*)&Sd<M
new MergeSort(), r=H?fTY<3E
new ImprovedMergeSort(), ?RsrY4P
new HeapSort() zw>L0gC
}; $a M5jH<
f4"UI-8;n
public static String toString(int algorithm){ ]4l2jY
return name[algorithm-1]; UTD_rQ
} hIJtu;}zU
=SfNA F
public static void sort(int[] data, int algorithm) { s<s}6|Z
impl[algorithm-1].sort(data); 8=`L#FkRp
} ).SJ*Re*^I
k QuEG5n.-
public static interface Sort { R~\R>\
public void sort(int[] data); X4 Arn,
} AE0uBv
~L)~p%rbi
public static void swap(int[] data, int i, int j) { ~3F'X
int temp = data; uuC ["Z
data = data[j]; Jka>Er
data[j] = temp; {zwH3)|Hn
} vd%g'fTy9
} 4)S99|1