[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; `h(JD$w
} umYq56dw
int i1=l; 'Zf_/y
int i2=mid+1; e|+U7=CK
for(int cur=l;cur<=r;cur++){ ;Aiuy{<
if(i1==mid+1) ;RW!l pGjP
data[cur]=temp[i2++]; Mi9A%ZmP
else if(i2>r) Q <EFd
data[cur]=temp[i1++]; (F]f{8
else if(temp[i1] data[cur]=temp[i1++]; /s(/6~D|
else FZz\zp
data[cur]=temp[i2++]; )MLOYX
} qr$=oCqa
} s d>&6R^
kg7oH.0E
} \&]'GsfF
cUaLv1:HI
改进后的归并排序: R~CQ=KQ.
{*As-Y:'F
package org.rut.util.algorithm.support; Gk*Mx6|N
vY<(3[pp
import org.rut.util.algorithm.SortUtil; q*TH),)J
"0+_P{w+
/** @P6K`'.0
* @author treeroot HQK%Y2S
* @since 2006-2-2 gAC}
* @version 1.0 gzvEy^X
*/ \i}n1Qd
public class ImprovedMergeSort implements SortUtil.Sort { P49lE
~!&WK,k6
private static final int THRESHOLD = 10; ]]Ypi=<'
aG8}R~wH&
/* lz EF^6I
* (non-Javadoc) $:s1x\ol
* tfvX0J
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) bQow,vf
*/ ?3kfhR
public void sort(int[] data) { U5z^R>k
int[] temp=new int[data.length]; y. @7aT5
mergeSort(data,temp,0,data.length-1); (EIdw\
} {7[^L1
"2)<'4q5)
private void mergeSort(int[] data, int[] temp, int l, int r) { RtGETiA\b
int i, j, k; ]y@9z b
int mid = (l + r) / 2; L{ ?& .iA
if (l == r) kYl$V=
return; mfQQ<Q@
if ((mid - l) >= THRESHOLD) 2I(0EBW
mergeSort(data, temp, l, mid); ;#I(ucB<
else -RVwPY
insertSort(data, l, mid - l + 1); "2}04b|"
if ((r - mid) > THRESHOLD) .6+j&{WNo!
mergeSort(data, temp, mid + 1, r); 1`r 4
else 9}iEEI
insertSort(data, mid + 1, r - mid); Aga2 I#1r
K_bF)6"
for (i = l; i <= mid; i++) { D)8&v`LS
temp = data; jn>3(GRGC$
} E< "aUnI
for (j = 1; j <= r - mid; j++) { k'&BAC.K,
temp[r - j + 1] = data[j + mid]; oqB(l[%z2
} JGX E{FT
int a = temp[l]; _W/s=pCh
int b = temp[r]; fySzZ
for (i = l, j = r, k = l; k <= r; k++) { hf^,
if (a < b) { Y[i>
data[k] = temp[i++]; di>"\On-
a = temp; |3/=dG
} else { YH&`+ +
data[k] = temp[j--]; f%` =>l
b = temp[j]; b/5?)!I
} j1*'yvGM
} kq8:h
} $IA(QC_]AO
Oj\lg2Ck
/** 2HoTj|
* @param data tm@&f
* @param l L TZ3r/
* @param i [0El z@.C
*/ 6C4c.+S
private void insertSort(int[] data, int start, int len) { a&6 3[p.<}
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); AIR,XlD
} {3@f(H m
} v{$X2z_$w
} /qed_w.p
} 57*z0<
.C$S DhJ~
堆排序： wUW^ O
rS\j9@=Y4
package org.rut.util.algorithm.support; fPZt*A__
$[T^S
import org.rut.util.algorithm.SortUtil; ' 7+x,TszI
t*m04* }
/** CeSr~Ikg|
* @author treeroot ynvU$}w ~'
* @since 2006-2-2 !'wh hi
* @version 1.0 D)U 9xA)J
*/ g&!UaJ[#9
public class HeapSort implements SortUtil.Sort{ Hdw;=]-
C=IT`iom1C
/* (non-Javadoc) &YGd!Q
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ;e415T
*/ 9+nB;vA
public void sort(int[] data) { i#Io;
MaxHeap h=new MaxHeap(); m~'!
h.init(data); Yrs7F.Y"
for(int i=0;i h.remove(); NQz*P.q
System.arraycopy(h.queue,1,data,0,data.length); JGOry \
} @X+m,u
%OB:lAeJ
private static class MaxHeap{ N4I`6uDgD
d00#;R
void init(int[] data){ uf]SPG#/D
this.queue=new int[data.length+1]; <k!M+}a 9V
for(int i=0;i queue[++size]=data; #<s6L"Z-
fixUp(size); 2-728
} W@`2+}
} {^=T&aCYdS
"s]r"(MX
private int size=0; T\I}s"d
XLb lVi@
private int[] queue; g>-pC a
3O7]~5 j1
public int get() { pYf57u
return queue[1]; Q)c3=.[>
} 3u#bx1
U$v|c%6
public void remove() { `-W.uOZ0
SortUtil.swap(queue,1,size--); SK [1h3d
fixDown(1); `)%zk W
} :+NZW9_
file://fixdown S"'0lS
private void fixDown(int k) { @&?E3?5ll
int j; `|coA2$rw
while ((j = k << 1) <= size) { O 7RIcU
if (j < size %26amp;%26amp; queue[j] j++; ,%"!8T
if (queue[k]>queue[j]) file://不用交换 h?R{5?RxK
break; J!Er%QUR
SortUtil.swap(queue,j,k); G%^jgr)
k = j; *o.f<OwOz
} SQ8xfD*
} \ne1Xu:hM
private void fixUp(int k) { g%Bh-O9\
while (k > 1) { /N= }wC
int j = k >> 1; fn.KZ
if (queue[j]>queue[k]) yJQ>u
break; OL]P(HRm]~
SortUtil.swap(queue,j,k); EQI9J#;+
k = j; 01=nS?
} M.fAFL
} 'yxN1JF
;\j7jz^uC
} zU7co.G
WX .Ax$fT
} Zc9@G-
K&ZN!VN/p
SortUtil： } I>68dS[
!C\$=\$
package org.rut.util.algorithm; 9d&@;&al
^POHQQ
import org.rut.util.algorithm.support.BubbleSort; ypU-/}Cf,
import org.rut.util.algorithm.support.HeapSort; dUN{@a\R0
import org.rut.util.algorithm.support.ImprovedMergeSort; ' ` _TFTO
import org.rut.util.algorithm.support.ImprovedQuickSort; 4> k"$l/:
import org.rut.util.algorithm.support.InsertSort; q9Zp8&<EqH
import org.rut.util.algorithm.support.MergeSort; T_R2BBT v
import org.rut.util.algorithm.support.QuickSort; F!7dGa$
import org.rut.util.algorithm.support.SelectionSort; `eZzYe(N
import org.rut.util.algorithm.support.ShellSort; YTpiOPf
PAng(tubl
/** 8tfM,.]_i
* @author treeroot '41'Gn
* @since 2006-2-2 OQW%nF9~
* @version 1.0 Kzwbr?&z
*/ a+'k#m
public class SortUtil { n*A?>NV
public final static int INSERT = 1; 37apOK4+
public final static int BUBBLE = 2; "I)/|x\G*
public final static int SELECTION = 3; V>Dqw!
public final static int SHELL = 4; ^h\(j*/#X
public final static int QUICK = 5; #[f]-c(!
public final static int IMPROVED_QUICK = 6; :eIi^K z[
public final static int MERGE = 7; Z8C~o)n9
public final static int IMPROVED_MERGE = 8; 7Tb[sc'
public final static int HEAP = 9; tGE=!qk
Cj%n?-
public static void sort(int[] data) { ;w/@_!~
sort(data, IMPROVED_QUICK); >?<S(
} Tp46K\}Uf
private static String[] name={ T@wgWE<0y_
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" CvhVV"n
}; 'oKen!?A
u9nJ;:
private static Sort[] impl=new Sort[]{ ai%*s&0/Y
new InsertSort(), .;rE4B
new BubbleSort(), o6tPQ (Vi
new SelectionSort(), d1P|v( `S9
new ShellSort(), Qb%o%z?hee
new QuickSort(), (+yH
new ImprovedQuickSort(), 3rVfBz
new MergeSort(), (E;+E\E
new ImprovedMergeSort(), Ez8k.]qu
new HeapSort() @C-03`JWuK
}; c@3mfc{
=yF]#>Ah
public static String toString(int algorithm){ :V3z`}Rl
return name[algorithm-1]; za%gD
} :)Pj()Os|
N0DzFXp
public static void sort(int[] data, int algorithm) { :KmnwYm
impl[algorithm-1].sort(data); &(7=NAQsE
} dI%?uk
+0}z3T1L
public static interface Sort { SR$ 'JGfp
public void sort(int[] data); p}oGhO&=
} /4*Y#IpZ
2FR+Z3&z
public static void swap(int[] data, int i, int j) { !4-4i
int temp = data; X+1Mv
data = data[j]; d-3.7nJ:
data[j] = temp; /#WvC;B
} V7b;qC'
} Rk,'ujc