[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; a0d ,
} \3{3ly~L
int i1=l; x3p9GAd#
int i2=mid+1; q#1X[A()
for(int cur=l;cur<=r;cur++){ RR>G]#k
if(i1==mid+1) /jrY%C
data[cur]=temp[i2++]; Etmo78e
else if(i2>r) %"7WXOv&z
data[cur]=temp[i1++]; n@B{vyy
else if(temp[i1] data[cur]=temp[i1++]; qw:9zYG}qW
else rB]W,8~%
data[cur]=temp[i2++]; *Wyl2op6
} 0#|7U_n
} yMIT(
=Nl5{qYz^&
} ~8Sqa%F>
k@qWig
改进后的归并排序: hhq$g{+[
nN{dORJlx
package org.rut.util.algorithm.support; QTh0SL
;?im(9h"v!
import org.rut.util.algorithm.SortUtil; aR(E7mXQ
aG3k4
/** f4]&pcK
* @author treeroot I#l;~a<9z
* @since 2006-2-2 >_#)3K1y8
* @version 1.0 _O52ai><b
*/ ec?1c&E
public class ImprovedMergeSort implements SortUtil.Sort { PHkDb/HIx|
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private static final int THRESHOLD = 10; E*4t8
Rkv
/* >6K4b/.5w
* (non-Javadoc) ??TdrTS
* </w7W3F
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) y''0PSfb#
*/ n2na9dX)w
public void sort(int[] data) { [a D:A
int[] temp=new int[data.length]; xT+ ;w[s
mergeSort(data,temp,0,data.length-1); OPJgIU%
} C5B=NAc
LV=^jsQ5
private void mergeSort(int[] data, int[] temp, int l, int r) { -R@JIe_28f
int i, j, k; DB Xm
int mid = (l + r) / 2; M7U:g}
if (l == r) 1E^{B8cm
return; !d|8'^gc
if ((mid - l) >= THRESHOLD) x[}06k'
mergeSort(data, temp, l, mid); E8;TLk4\
else *K!7R2Rat
insertSort(data, l, mid - l + 1); M5rwoyn
if ((r - mid) > THRESHOLD) (+$ol'i
mergeSort(data, temp, mid + 1, r); \6c8z/O7
else I3ho(Kdi
insertSort(data, mid + 1, r - mid); gL,"ef+nM
p[;8
for (i = l; i <= mid; i++) { b.6ZfB,+G
temp = data; T:@7S
} Bb_}YU2#
for (j = 1; j <= r - mid; j++) { hOSf'mi
temp[r - j + 1] = data[j + mid]; 5)x6Q|-u
} toN
int a = temp[l]; X o_] v
int b = temp[r]; =u[rOU{X"W
for (i = l, j = r, k = l; k <= r; k++) { |<QI%Y$dr
if (a < b) { wV %8v\
data[k] = temp[i++]; V4oak!}?
a = temp; d.b?!kn
} else { 6o9sR)c ?
data[k] = temp[j--]; XL?Aw
b = temp[j]; oEPNN'~3
} G/%Ubi6%
} B^Bbso'{1
} k{qLkcOg=
\ j x0ZHR
/** I<9n(rA
* @param data ){jqfkL
* @param l D;J|eC>^
* @param i Vy&f"4~
*/ G$S1#F -
private void insertSort(int[] data, int start, int len) { cC'^T6
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); l92!2$]b
} Y"s )u7
} 8t--#sDy{0
} xf[zEEt
} @qpYDnJ:
JYl\<Z' {
堆排序： ,Os7T 1>
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package org.rut.util.algorithm.support; D'85VZEFyo
oFwG+W/
import org.rut.util.algorithm.SortUtil; widI s[ )
nxf{PbHk
/** ;4R=eI
* @author treeroot HUD7{6}4
* @since 2006-2-2 Y]M^n&f
* @version 1.0 ;*"!:GR%h
*/ ''%;EW>
public class HeapSort implements SortUtil.Sort{ *u<rU,C8
giQ{Xrj
/* (non-Javadoc) h<Jc;ht
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) tu7+LwF7
*/ =]WW'~
public void sort(int[] data) { @-}D7?
MaxHeap h=new MaxHeap(); $8EV,9^U
h.init(data); A4}JZi6@
for(int i=0;i h.remove(); IsWcz+1n
System.arraycopy(h.queue,1,data,0,data.length); ^#}dPGm
} [U%.Gi
ef^Cc)S-Q
private static class MaxHeap{ <8g *O2
\}U[}5Pk&
void init(int[] data){ wK2yt?
this.queue=new int[data.length+1]; <[/PyNYK
for(int i=0;i queue[++size]=data; HDa~7wE
fixUp(size); #: dR^zr<
} :QxL 9&"
} :Pj W:]
g?w2J6Z.`J
private int size=0; M" xZz
uDpf2(>s
private int[] queue; 87&KQ_
RI#lI~&)
public int get() { )PsN_ 42~
return queue[1]; XKpL4]{&q4
} u-8X$aJ
"sz.v<F0:s
public void remove() { y|FBYcn#F
SortUtil.swap(queue,1,size--); v@F|O8t:s
fixDown(1); E_ o{c5N
} %kFTnXHK
file://fixdown Qx9>,e6+
private void fixDown(int k) { +3NlkN#
int j; ./7&_9|<
while ((j = k << 1) <= size) { }<6oFUZ
if (j < size %26amp;%26amp; queue[j] j++; T][-'0!
if (queue[k]>queue[j]) file://不用交换 bbE bf !E
break; KyuA5jQ7
SortUtil.swap(queue,j,k); 4.,KEt'H
k = j; <K=@-4/Bp
} Eqz4{\
} ?|%\<h@;
private void fixUp(int k) { TBoM{s=.
while (k > 1) { <`oCz Q1
int j = k >> 1; +Q@/F~1@6@
if (queue[j]>queue[k]) j;ff } b
break; ,\\%EZ%a
SortUtil.swap(queue,j,k); 2rPcNh9
k = j; fcgDU *A%
} s_S<gR
} NqQM!B]
^8o_Iz)r,
} 2N8rM}?90
g:G%Ei~sF
} "N?%mCPI
vjOG?-
SortUtil： %igFHh?
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package org.rut.util.algorithm; *F26}q
.g6PrhzFbk
import org.rut.util.algorithm.support.BubbleSort; Pg!;o= {M
import org.rut.util.algorithm.support.HeapSort; 1qB!RIau
import org.rut.util.algorithm.support.ImprovedMergeSort; h,!G7V
import org.rut.util.algorithm.support.ImprovedQuickSort; h|(ZXCH
import org.rut.util.algorithm.support.InsertSort; 1YF+(fk
import org.rut.util.algorithm.support.MergeSort; ?.rH;:9To
import org.rut.util.algorithm.support.QuickSort; ,7n;|1`
import org.rut.util.algorithm.support.SelectionSort; >z fq*_
import org.rut.util.algorithm.support.ShellSort; s=\LewF1<
[H6X2yjj|
/** kg/+vJ
* @author treeroot xA[Wb'
* @since 2006-2-2 FR@PhMUS
* @version 1.0 )[@YHE5g
*/ !s#'pTZk4
public class SortUtil { s2(w#n)
public final static int INSERT = 1; 7yqSt)/U
public final static int BUBBLE = 2; ~x4{P;y
public final static int SELECTION = 3; 78^UgO/
public final static int SHELL = 4; []2$rJZD9
public final static int QUICK = 5; 4Vb}i[</
public final static int IMPROVED_QUICK = 6; j#Ky0+@V
public final static int MERGE = 7; z*NC?\
public final static int IMPROVED_MERGE = 8; 3<e(@W}n-M
public final static int HEAP = 9; p]1yd;Jt
xN{"%>Mx
public static void sort(int[] data) { Dr8WV\4@
sort(data, IMPROVED_QUICK); d'lr:=GQ
} 7\\~xSXh
private static String[] name={ ex@,F,u>o
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" E1U4v&P
}; gW6G+
6oTbn{=UUq
private static Sort[] impl=new Sort[]{ %h/#^esi
new InsertSort(), ^\7 x5gO
new BubbleSort(), 2$SofG6D}
new SelectionSort(), \GbHS*\+
new ShellSort(), tpNtoqg_$
new QuickSort(), &.+n L
new ImprovedQuickSort(), s{1Deek=
new MergeSort(), `PQ?8z|
new ImprovedMergeSort(), niBjq#bJi
new HeapSort() |5<&r]xN
}; =x='<{jtgW
y'0dl "Dy\
public static String toString(int algorithm){ #TW>'lF
return name[algorithm-1]; 0]h8)EW
} &z xBi"
U'Ja\Ek/f
public static void sort(int[] data, int algorithm) { w$(0V$l_
impl[algorithm-1].sort(data); P- `~]]
} 1{hoO<CJ
YP$*;l
public static interface Sort { @LWxz
public void sort(int[] data); ]JqkC4|
} Bp$+ F/
t=E|RYC(k
public static void swap(int[] data, int i, int j) { !CVBG*E^l
int temp = data; D_ Bx>G9
data = data[j]; O%fp;Y{`
data[j] = temp; |$SvD2^
} 8}pcanPg
} :9!0Rm