[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; #a~BigZ[G
} }cGILH%
int i1=l; f(eXny@Y
int i2=mid+1; ';8 ,RTe
for(int cur=l;cur<=r;cur++){ 5S!j$_(
if(i1==mid+1) qC"`i}7
data[cur]=temp[i2++]; tjB)-=j[
else if(i2>r) dY0W=,X$7T
data[cur]=temp[i1++]; SqRM*Cf=
else if(temp[i1] data[cur]=temp[i1++]; YQFz6#Ew
else =54D#,[B
data[cur]=temp[i2++]; hCF_pt+
} F%&lM[N%
} jPZ+~:m+
n7~4*B
} B[EOz\?=m
;r~1TUKb
改进后的归并排序: %saP>]o
DbB<8$
package org.rut.util.algorithm.support; Gf9sexn]l
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import org.rut.util.algorithm.SortUtil; !\d~9H%`B
Xf#;`*5
/** KehM.c^
* @author treeroot 7t#Q8u?
* @since 2006-2-2 I+.U.e^gx
* @version 1.0 l<4P">M!.
*/ O43"-
public class ImprovedMergeSort implements SortUtil.Sort { l59 N0G
m-tn|m!J
private static final int THRESHOLD = 10; btnD+O66<
\),f?f-m
/* u$zRm(!RB
* (non-Javadoc) tN4&#YK<
* Sw; kUJ
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Fq <JxamR
*/ I~YV&12
public void sort(int[] data) { `uk=2k}&m
int[] temp=new int[data.length]; GYb&'#F~t
mergeSort(data,temp,0,data.length-1); fK]%*i_"
} CMbID1M3
1,$"'lKwt
private void mergeSort(int[] data, int[] temp, int l, int r) { X[$|I9
int i, j, k; %g5#q64
int mid = (l + r) / 2; J!6w9,T_
if (l == r) >b9J!'G,(
return; *q,nALs
if ((mid - l) >= THRESHOLD) Ja5od
mergeSort(data, temp, l, mid); g@s`PBF7`
else ,YBO}l
insertSort(data, l, mid - l + 1); ,ZrR*W?iF
if ((r - mid) > THRESHOLD) "K9[P:nw
mergeSort(data, temp, mid + 1, r); Wf5;~RJC?
else p<0=. ~
insertSort(data, mid + 1, r - mid); -EFdP]XO
#6YpV)
for (i = l; i <= mid; i++) { Hf1b&8&:K
temp = data; m{Uh{G$
} :BV$3]y
for (j = 1; j <= r - mid; j++) { nVgvn2N/
temp[r - j + 1] = data[j + mid]; ZnAQO3%y
} d/Wp>A@dob
int a = temp[l]; W-|CK&1
int b = temp[r]; <P0 P*>M
for (i = l, j = r, k = l; k <= r; k++) { "[fPzIP9
if (a < b) { YryMB,\
data[k] = temp[i++]; !T:7xEr
a = temp; 4Y3@^8h&=
} else { xhho{
data[k] = temp[j--]; ]}l.*v\uK
b = temp[j]; j1->w8
} W+=j@JY}q9
} hS &H*
} g@M5_I(W
<3N\OV2
/** j x< <h_j
* @param data o+{i26%
* @param l '~f*O0_
* @param i Ei+lVLoC
*/ ht6}v<x.eA
private void insertSort(int[] data, int start, int len) { 6(htpT%J
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); NJd4( P
} VyYrL]OrA
} $6 Hf[(/e
} t.RDS2N|
} c2:,
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堆排序： NRP)'E
lFcHE c
package org.rut.util.algorithm.support; A/}[Z\C
~Eik&5 z
import org.rut.util.algorithm.SortUtil; CKFr9bT{
Iix:Y}
/** {&D$U'ye
* @author treeroot 76o[qay
* @since 2006-2-2 -Q Mwtr#q}
* @version 1.0 G)b:UJa"
*/ +8\?7,FY
public class HeapSort implements SortUtil.Sort{ EW4a@
IUh9skW5
/* (non-Javadoc) ^2%)Nq;O
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 9{S$%D
*/ }uaFmXy3
public void sort(int[] data) { yV L >Ie/
MaxHeap h=new MaxHeap(); .8ikcs
h.init(data); ^!k_"C)B
for(int i=0;i h.remove(); H=WB6~8)
System.arraycopy(h.queue,1,data,0,data.length); ?5lO1(
} IIXA)b!
&,Loqr
private static class MaxHeap{ [J eq ?X9
5S&Qj7kr
void init(int[] data){ yLXIjR
this.queue=new int[data.length+1]; Xq37:E2
for(int i=0;i queue[++size]=data; /4+zT?f
fixUp(size); I~p*~mLh'
} 2Q%M2Ua
} ds+2z=!!e
}z\t}lven
private int size=0; ' Gx\
*M:p[.=1
private int[] queue; !{(crfXB
QFhyidm=]
public int get() { Pd d(1K*
return queue[1]; 3^q9ll7Op
} YbWz!.WPe
`-b{|a J
public void remove() { aYpc\jJ
SortUtil.swap(queue,1,size--); C9k"QPE
fixDown(1); \7xc*v [
} yEJ3O^(F
file://fixdown (~F}O
private void fixDown(int k) { J &=5h.G$
int j; D?*du#6
while ((j = k << 1) <= size) { sH1ucZ>9Y
if (j < size %26amp;%26amp; queue[j] j++; VTDnh*\5
if (queue[k]>queue[j]) file://不用交换 e,#5I(E
break; HD$`ZV
SortUtil.swap(queue,j,k); A93(} V7I
k = j; 6wq%4RI0
} p`U#
} ~fcC+"7q/
private void fixUp(int k) { lY,9bSF$
while (k > 1) { QP!;Gwqr
int j = k >> 1; 1{cF/ :o
if (queue[j]>queue[k]) lSd tw b
break; :c )R6=v
SortUtil.swap(queue,j,k); UaQW<6+
k = j; e9S*^2;
} U%VFr#
} hmb=_W
?,hGKSC
} z [u!C/
N5cC!K
} z?`7g%Z?{
-(%Xq{
SortUtil： e(DuJ-
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package org.rut.util.algorithm; {ynI]Wj`L
v6x jLP;O
import org.rut.util.algorithm.support.BubbleSort; 33hP/p%
import org.rut.util.algorithm.support.HeapSort; m#6p=E
import org.rut.util.algorithm.support.ImprovedMergeSort; ~e){2_J&n
import org.rut.util.algorithm.support.ImprovedQuickSort; yC|odX#
import org.rut.util.algorithm.support.InsertSort; w`#9Re
import org.rut.util.algorithm.support.MergeSort; 56NDU>j$
import org.rut.util.algorithm.support.QuickSort; 7s:cg
import org.rut.util.algorithm.support.SelectionSort; 2AxKB+c1`
import org.rut.util.algorithm.support.ShellSort; a~-k} G5
%^"i\-*|S
/** 4m~p(r
* @author treeroot kqC7^x
* @since 2006-2-2 S|yDGT1
* @version 1.0 dOgc%(kz
*/ mwz!7Q
public class SortUtil { UK@hnQU8`
public final static int INSERT = 1; EW]8k@&g
public final static int BUBBLE = 2; ~1,$
public final static int SELECTION = 3; d1*0?GTT
public final static int SHELL = 4; 4}YHg&@\d%
public final static int QUICK = 5; O=!EqaExW
public final static int IMPROVED_QUICK = 6; LR"7e
public final static int MERGE = 7; D42!#
public final static int IMPROVED_MERGE = 8; |*]<*qnZt
public final static int HEAP = 9; |oR{c%z05
brF) %x`
public static void sort(int[] data) { nnd-d+$
sort(data, IMPROVED_QUICK); y,<\d/YY@
} $B%3#-
private static String[] name={ AX )dZdd
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" BBl9<ne$
}; Fj<a;oV
v}^uN+a5
private static Sort[] impl=new Sort[]{ v?DA>
new InsertSort(), "(\]-%:7
new BubbleSort(), x.(Sv]+[
new SelectionSort(), zj1_#=]
new ShellSort(), pM!cF
new QuickSort(), <2I<Z'B,e
new ImprovedQuickSort(), Et)j6xz/F
new MergeSort(), 8..g\ZT
new ImprovedMergeSort(), }.<]A
new HeapSort() s8r[U, }(
}; }\ya6Gi8
R}OjSiS\
public static String toString(int algorithm){ w~e$ul(IQM
return name[algorithm-1]; 6ZGw 3p)
} 5@i(pVWZ
r"KW\HN8
public static void sort(int[] data, int algorithm) { >T29kgF2
impl[algorithm-1].sort(data); Rd1I$| Y
} {8~xFYc:
!OR%AdxB
public static interface Sort { 0'`#I
public void sort(int[] data); nh"LdHqiDB
} %#lJn.o
j5 W)9HW:
public static void swap(int[] data, int i, int j) { {w9GMqq
int temp = data; 1-pxM~Y
data = data[j]; tW3Nry
data[j] = temp; o{K#LP
} 1tCe#*|95
} nqib`U@"