[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; yJqDB$0
} ;YQ6X>
int i1=l; X%iqve"{nB
int i2=mid+1; hhylsm
for(int cur=l;cur<=r;cur++){ 2y8FP#
if(i1==mid+1) em^2\*sxpA
data[cur]=temp[i2++]; ?H!&4o
else if(i2>r) 5qqU8I
data[cur]=temp[i1++]; hN1[*cF
else if(temp[i1] data[cur]=temp[i1++]; I|>IV
else 2e ~RM2PQ
data[cur]=temp[i2++]; b^8"EBo
} +&_n[;
} *x2u
P:XX8&#
} yFFNzw{
Z$YG'p{S
改进后的归并排序: +'` ^ N
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package org.rut.util.algorithm.support; s\3ZE11L
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import org.rut.util.algorithm.SortUtil; ]Qx-f* D6
9@Z++J.^y
/** =`gFwH<
* @author treeroot F 'HYWH0?
* @since 2006-2-2 D{[i_K
* @version 1.0 )MM(HS
*/ J/vcP
public class ImprovedMergeSort implements SortUtil.Sort { )=,;-&AR
9B3}LVg\
private static final int THRESHOLD = 10; :J5CmU$
Y3hudjhLl
/* gp{P _
* (non-Javadoc) etP`q:6^c
* d k|X&)xTJ
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Y:'c<k
*/ P'Jb')m
public void sort(int[] data) { +n8,=}
int[] temp=new int[data.length]; rf&nTDaWI
mergeSort(data,temp,0,data.length-1); ]b&qC (
} FC8= ru
>LR+dShG
private void mergeSort(int[] data, int[] temp, int l, int r) { hN:2(x
int i, j, k; RveMz$Yy
int mid = (l + r) / 2; 'cbD;+YH
if (l == r) /lvH p
return; opxPK=kJ
if ((mid - l) >= THRESHOLD) rMUQh~a/
mergeSort(data, temp, l, mid); #+P)X_i`
else \6Hu&WHy
insertSort(data, l, mid - l + 1); Dr"F5Wbg
if ((r - mid) > THRESHOLD) C F<
mergeSort(data, temp, mid + 1, r); * @j#13.
else D#&N?<}
insertSort(data, mid + 1, r - mid); JE+{Vx}
}Rq-IRa'
for (i = l; i <= mid; i++) { YPav5<{a
temp = data; D&&11Iz&
} N+ R/ti
for (j = 1; j <= r - mid; j++) { })r[qsv
temp[r - j + 1] = data[j + mid]; E|^~R}z)
} dCMWv~>
int a = temp[l]; <?iwi[S
int b = temp[r]; Q1@V?`rkS{
for (i = l, j = r, k = l; k <= r; k++) { 0IjQqI
if (a < b) { uBC*7Mkm
data[k] = temp[i++]; 7J2i /m
a = temp; t%<d}QuHW
} else { ^?tF'l`
data[k] = temp[j--]; +#y[sKa
b = temp[j]; Kth^WHL
} /ZKO\q
} X\1'd,V
} j^Z3
6*2z^P9FRj
/** . RNQlh3
* @param data v ~%6!Tr
* @param l "-TIao#
* @param i GVp2|\-L
*/ yeNC-U<
private void insertSort(int[] data, int start, int len) { P A9 ]L
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); hU `H\LE
} b-+iL
} wLC|mByq
} 8a1G0HRQ
} l$Y7CIH
~z!U/QR2
堆排序： *(x`cf;k
2,<!l(X
package org.rut.util.algorithm.support; #sEbu^
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import org.rut.util.algorithm.SortUtil; /\_ s
T;}pMRd%
/** ZuF-$]oL&
* @author treeroot *,o)`
* @since 2006-2-2 nMXSpX>!|
* @version 1.0 P{)eZINlE
*/ yHhBUpIo
public class HeapSort implements SortUtil.Sort{ b07 MTDFH7
nlK"2/W
/* (non-Javadoc) NQ%lwE~
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ?+b )=Z
*/ dd>stp
public void sort(int[] data) { .t0Q>:}&b
MaxHeap h=new MaxHeap(); Ut8yA"Y~
h.init(data); Uw][U
for(int i=0;i h.remove(); nYMdYt04sl
System.arraycopy(h.queue,1,data,0,data.length); [:sV;37s
} 7WW@%4(
!B(6
private static class MaxHeap{ qI"@ PI!s
pVPCxP
void init(int[] data){ }0|,*BkI m
this.queue=new int[data.length+1]; Rg,pC.7;
for(int i=0;i queue[++size]=data; 2|Hq[c=~
fixUp(size); FU~ Ip
} PSNrY e
} 7 rOziKZ"
n_hV;
private int size=0; Lu6!W
/N7j5v(
private int[] queue; F%t`dz!L
)avli@W-3j
public int get() { ?x"<0k1g
return queue[1]; 9#iu#?*B
} &mKtW$K` q
@]t}bF]
public void remove() { [GX5jD#
SortUtil.swap(queue,1,size--); _JiB=<Fkr
fixDown(1); 6+e@)[l.zc
} ksT2_Ic
file://fixdown q<yp6Q3^
private void fixDown(int k) { S.aSNH<
int j; x-+Hy\^@|
while ((j = k << 1) <= size) { (2Z-NVU#
if (j < size %26amp;%26amp; queue[j] j++; (hS j4Cp
if (queue[k]>queue[j]) file://不用交换 +dcBh Dq
break; c=K .|g,
SortUtil.swap(queue,j,k); 61HU_!A8S
k = j; yf*^Y74
} ;z/Z(7<;;
} u;GS[E4
private void fixUp(int k) { $a>,sL&;
while (k > 1) { +1~Y2
int j = k >> 1; 5fMVjd
if (queue[j]>queue[k]) fwK5p?Xhm
break; lO! Yl:;m%
SortUtil.swap(queue,j,k); c"Ddw'?e
k = j; D]\of#%T
} tAO,s ZW
} zgXg-cr
dE~]%fUFy-
} @&p:J0hbp
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} ZxLdh8v.
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SortUtil： S-l<+O1fy
Ut.%=o;&[
package org.rut.util.algorithm; ]r|sU.Vl
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import org.rut.util.algorithm.support.BubbleSort; DSjEoWj
import org.rut.util.algorithm.support.HeapSort; Htl2CcZ
import org.rut.util.algorithm.support.ImprovedMergeSort; C{(&Yy"
import org.rut.util.algorithm.support.ImprovedQuickSort; (7Su{tq
import org.rut.util.algorithm.support.InsertSort; 3,`I\>No
import org.rut.util.algorithm.support.MergeSort; }7?_>
import org.rut.util.algorithm.support.QuickSort; 3-x ;_
import org.rut.util.algorithm.support.SelectionSort; 'KvSI=$
import org.rut.util.algorithm.support.ShellSort; 2%4u/
4Z8FLA+T,
/** : EA-L
* @author treeroot )Fk*'6
* @since 2006-2-2 r@")MOGc
* @version 1.0 [$\KS_,Mn
*/ WH|TdU$V
public class SortUtil { KU$:p^0l;*
public final static int INSERT = 1; 8XfhXm>~
public final static int BUBBLE = 2; uuHg=8(
public final static int SELECTION = 3; Qa`+-Wu8
public final static int SHELL = 4; m\zCHX#n
public final static int QUICK = 5; 75v7w
public final static int IMPROVED_QUICK = 6; (\8IgQ{
public final static int MERGE = 7; we:P_\6
public final static int IMPROVED_MERGE = 8; BD.&K_AW
public final static int HEAP = 9; R+sv?4k
,9,cN-/a
public static void sort(int[] data) { U:r^4,Mz*
sort(data, IMPROVED_QUICK); ]@Z[/z%~04
} {L'uuG\9U
private static String[] name={ q@i>)nC R
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" ^8.s"4{
}; n4XEyCrD
u.yYE,9
private static Sort[] impl=new Sort[]{ #~}4< 18
new InsertSort(), O0l1AX"
new BubbleSort(), f;D(X/"f]
new SelectionSort(), a``/x_EZMn
new ShellSort(), h 8<s(WR
new QuickSort(), kxQ al
new ImprovedQuickSort(), lvOM1I
new MergeSort(), _xsHU`(J#
new ImprovedMergeSort(), zK_Q^M`
new HeapSort() r\A|fiL
}; k1'd';gQ
Z-j?N{3&
public static String toString(int algorithm){ ?`= <*{_o
return name[algorithm-1]; 0VnRtLnqI
} t/lQSUip
\E {'|
public static void sort(int[] data, int algorithm) { lLur.f
impl[algorithm-1].sort(data); 3mQ3mV:
} -G[TlH06
:jy}V'bn$
public static interface Sort { %0p9\I
public void sort(int[] data); lFp:F5
} <S^Hy&MD>
6&"*{E
public static void swap(int[] data, int i, int j) { 5KNa-\
int temp = data; ),>whCtsI
data = data[j]; /2Z7
data[j] = temp; w7E#mdW
} fh*7VuAc
} :IO"' b