[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; u, ff>/1
} s7<AfaJPF
int i1=l; #spCtZE
int i2=mid+1; >z03{=sAN
for(int cur=l;cur<=r;cur++){ ^~dWU>
if(i1==mid+1) ]d]]'Hk
data[cur]=temp[i2++]; dM5-;
else if(i2>r) ,}PgOJZ
data[cur]=temp[i1++]; e(sk[guvX
else if(temp[i1] data[cur]=temp[i1++]; bOB\--:]
else }EPY^VIw
data[cur]=temp[i2++]; [GR;?R5
} a[C@
} KXy6Eno
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} 9Na$W:P c
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改进后的归并排序: `A>@]d
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package org.rut.util.algorithm.support; 8y L Y
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import org.rut.util.algorithm.SortUtil; UZMd~|
S!UaH>Rh
/** 3<!7>]A
* @author treeroot n]9$:aLZ
* @since 2006-2-2 Ey2^?
* @version 1.0 )UR7i8]!0
*/ QY/w
public class ImprovedMergeSort implements SortUtil.Sort { zdYjF|
r" y.KD^
private static final int THRESHOLD = 10; 2:kH[#
Ie_wHcM<
/* +R&gqja
* (non-Javadoc) paK2xX8E
* *T/']t
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) #4PN"o@
*/ w}KkvP^
public void sort(int[] data) { D^O@'zP=At
int[] temp=new int[data.length]; y0#2m6u
mergeSort(data,temp,0,data.length-1); \85i+q:LuA
} gJXaPJA{
M-71 1|eGI
private void mergeSort(int[] data, int[] temp, int l, int r) { #] QZ
int i, j, k; wj,=$RX
int mid = (l + r) / 2; +whDU2 "
if (l == r) q1,~
return; py4 h(04u
if ((mid - l) >= THRESHOLD) Xhm c6?
mergeSort(data, temp, l, mid); DUS6SO
else SU0 hma8
insertSort(data, l, mid - l + 1); ! mHO$bQ"
if ((r - mid) > THRESHOLD) fVlB=8DNk&
mergeSort(data, temp, mid + 1, r); 5+'<R8{:,
else GJrG~T
insertSort(data, mid + 1, r - mid); C_Dn{
;+%rw2Z,B
for (i = l; i <= mid; i++) { r&CiSMS*
temp = data; t0S1QC+
} Cye.gsCT
for (j = 1; j <= r - mid; j++) { z_HdISy0
temp[r - j + 1] = data[j + mid]; 3w=J'(RU
} Vksuu@cch
int a = temp[l]; 5+vaE 2v
int b = temp[r]; _/|\aqF.
for (i = l, j = r, k = l; k <= r; k++) { aUp g u"
if (a < b) { 80I#TA6C
data[k] = temp[i++]; w:0E(z
a = temp; p{_" bB
} else { @dKTx#gZ
data[k] = temp[j--]; s<Ziegmw|g
b = temp[j]; +>,I1{u%&
} m`XHKRp
} 7dWS
} qPNR`%}Q
R_C)
/** TbU#96"~.
* @param data 4 KiY6)
* @param l (=0.inZ
* @param i ~$'awY
*/ ;l+Leex
private void insertSort(int[] data, int start, int len) { # d
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); .Mbz3;i0
} 3`g^
} 1M6D3d_
} {c'lhUB
} ?9/G[[(
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堆排序： W\3X=@|u)
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package org.rut.util.algorithm.support; P pb\6|*
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import org.rut.util.algorithm.SortUtil; V gWRW7Se
^q5#ihM
/** ?s01@f#
* @author treeroot afVT~Sf{
* @since 2006-2-2 +(Ae4{z"1+
* @version 1.0 /v{I
*/ )nkY_'BV
public class HeapSort implements SortUtil.Sort{ 4(+PD&_J
%b$>qW\*&
/* (non-Javadoc) )A6<c%d =x
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) q V=!ORuj
*/ -@'FW*b
public void sort(int[] data) { Lbgi7|&
MaxHeap h=new MaxHeap(); Wr 4,YQM
h.init(data); XFl6M~ c
for(int i=0;i h.remove(); }bxs]?OW>
System.arraycopy(h.queue,1,data,0,data.length); c 9Mz]1@f
} <'u'#E@"sl
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private static class MaxHeap{ #qki
y29m/i:
void init(int[] data){ IGl9g_18
this.queue=new int[data.length+1]; M`_0C38
for(int i=0;i queue[++size]=data; HMXE$d=[
fixUp(size); BmT!aue
} i!Ba]n
} _BufO7`.
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private int size=0; MgZ/(X E
4#D,?eA7
private int[] queue; dtDFoETz
5P2K5,o|n~
public int get() { &>O+}>lr9
return queue[1]; \bXa&Lq
} =;L|gtH"
UQsN'r\tS
public void remove() { \z$= K
SortUtil.swap(queue,1,size--); j 7B!h|
fixDown(1); )%TmAaj9d
} F,kZU$
file://fixdown 8*X4\3:*N
private void fixDown(int k) { &=[WIG+rk
int j; }MySaL>
while ((j = k << 1) <= size) { w0. u\
if (j < size %26amp;%26amp; queue[j] j++; +{]j]OP
if (queue[k]>queue[j]) file://不用交换 k$VlfQ'+
break; 5P bW[
SortUtil.swap(queue,j,k); PCA4k.,T
k = j; [),ige
} I%):1\)
} '/p4O2b,
private void fixUp(int k) { ?6!LL5a.
while (k > 1) { P}iE+Z3
int j = k >> 1; 8ag!K*\V<
if (queue[j]>queue[k]) [E_9V%^
break; lE;!TQj:X
SortUtil.swap(queue,j,k); bA 2pbjg=
k = j; @Qe0! (_=
} btB%[]
} 9c],<;{'
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} ceA9){
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} U$g?!Yl0
f);FoVa6
SortUtil： \8tsDG(1 '
#yen8SskB
package org.rut.util.algorithm; 4-w{BZuS
UiWg<_<t
import org.rut.util.algorithm.support.BubbleSort; =4!mAo}
import org.rut.util.algorithm.support.HeapSort; $G>.\t
import org.rut.util.algorithm.support.ImprovedMergeSort; ]:;&1h3'7
import org.rut.util.algorithm.support.ImprovedQuickSort; }H4RR}g
import org.rut.util.algorithm.support.InsertSort; 'w/hw'F6
import org.rut.util.algorithm.support.MergeSort; ]9-\~Mwh
import org.rut.util.algorithm.support.QuickSort; 2oW"'43X
import org.rut.util.algorithm.support.SelectionSort; XW9!p.*.U
import org.rut.util.algorithm.support.ShellSort; _F{C\}
~&O%N
/** ]n~V!hl?A
* @author treeroot }JfjX'
* @since 2006-2-2 ?2a$*(
* @version 1.0 /reX{Y
*/ u2I Cl
public class SortUtil { BUFv|z+H
public final static int INSERT = 1; =a!=2VN9y
public final static int BUBBLE = 2; & kIFcd@
public final static int SELECTION = 3; :&Nbw
public final static int SHELL = 4; $]1=\I
public final static int QUICK = 5; 6*?F@D2&
public final static int IMPROVED_QUICK = 6; $>gFf}#C
public final static int MERGE = 7; E^PB)D(.
public final static int IMPROVED_MERGE = 8; i4Jc.8^9$
public final static int HEAP = 9; oU|c.mYe
8t`?#8D}
public static void sort(int[] data) { 0x7'^Z>-oe
sort(data, IMPROVED_QUICK); $kgVa^
} e!`i3KYn"
private static String[] name={ !k%#R4*>
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" <{pz<io)
}; t) +310w
c,22*.V/
private static Sort[] impl=new Sort[]{ g0 [w-?f
new InsertSort(), ;4a{$Lw~^9
new BubbleSort(), zT/\Cj68
new SelectionSort(), Bq>m{
new ShellSort(), VL^EHb7
new QuickSort(), d _ e WcI
new ImprovedQuickSort(), Q\)F;:|
new MergeSort(), 'yth'[
new ImprovedMergeSort(), B *vM0
new HeapSort() H]!"Zq k
}; >p/`;Kq@
51u0]Qx;fm
public static String toString(int algorithm){ Bt#N4m[X*|
return name[algorithm-1]; ^{{qV
} \9d$@V
u>$t'
public static void sort(int[] data, int algorithm) { X8|EHb<
impl[algorithm-1].sort(data); %SI'BJ
} 4YHY7J
f)!Z~t &
public static interface Sort { Fi1@MG5$2
public void sort(int[] data); zLit
} P4?glh q#
mq[ug>
public static void swap(int[] data, int i, int j) { BHw, 4#F1;
int temp = data; *H122njH+T
data = data[j]; F/Pep?'
data[j] = temp; OZT.=^:A
} #%s#c0TX
} VX/#1StC