[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; /QTGZb
} __)9JF
int i1=l; k*M1m'1
int i2=mid+1; _,5(HETE2
for(int cur=l;cur<=r;cur++){ ++xEMP)
if(i1==mid+1) Dk:Zeo]+my
data[cur]=temp[i2++]; * ,,D%L
else if(i2>r) MSw/_{
data[cur]=temp[i1++]; *&LVn)@[`
else if(temp[i1] data[cur]=temp[i1++]; UAa2oY&
else \ B<(9
data[cur]=temp[i2++]; ]e R1 +Nl
} Dg\fjuK9
} ]kR 93
6Vi #O^>
} )'92{-A0
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改进后的归并排序: 6MF%$K3
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package org.rut.util.algorithm.support; .hnGHX
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import org.rut.util.algorithm.SortUtil; #}l}1^$
Es1Yx\/:
/** \3Ys8umKq
* @author treeroot J=5G<
* @since 2006-2-2 |>Kf_b Y#
* @version 1.0 HX?5O$<<N
*/ Rax}r
public class ImprovedMergeSort implements SortUtil.Sort { !ZHPR:k|
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private static final int THRESHOLD = 10; sLPFeibof5
a'rN&*P
/* 4, 8gf2
* (non-Javadoc) e$fxC-sZ
* (WX,&`a<$
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) lhKd<Y"
*/ =k'3rm*ld
public void sort(int[] data) { /\(0@To
int[] temp=new int[data.length]; P%(pbG-X.
mergeSort(data,temp,0,data.length-1); }r9f}yX9Q
} i` n,{{x&4
W_ngB[
private void mergeSort(int[] data, int[] temp, int l, int r) { 8it|yK.G@&
int i, j, k; 0'%R@|
int mid = (l + r) / 2; }2-{4JIq}
if (l == r) Atzp\oO
return; v_En9~e^n
if ((mid - l) >= THRESHOLD) 1B}6 zJ
mergeSort(data, temp, l, mid); Q9]7.^l
else ym{?vY h
insertSort(data, l, mid - l + 1); W:ih#YW_F
if ((r - mid) > THRESHOLD) 7_?:R2]n
mergeSort(data, temp, mid + 1, r); 120<(#
else Q_x/e|sd
insertSort(data, mid + 1, r - mid); bBb$0HOF
uL1e?
for (i = l; i <= mid; i++) { =(3Qbb1i
temp = data; ]Jq1b210
} u yzc"di
for (j = 1; j <= r - mid; j++) { =;9Wh!{
temp[r - j + 1] = data[j + mid]; SL? ! RQ
} K, WNM S
int a = temp[l]; =\eM -"r
int b = temp[r]; ~ b!mKyrZ
for (i = l, j = r, k = l; k <= r; k++) { f nX!wN
if (a < b) { hbD@B.PD
data[k] = temp[i++]; qH: ` O%,
a = temp; *!ZU"q}i
} else { wm}6$n?Za
data[k] = temp[j--]; k"uqso/
b = temp[j]; ;O}%_ef@
} h \hQ
} MMqkNe
} Xp[[ xV|
; =ai]AYW
/** mnzamp
* @param data <UQaRI[55
* @param l dE7 kd=.o
* @param i M`*B/Fh2
*/ s4<[f%^
private void insertSort(int[] data, int start, int len) { Am'5|
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); E ~<SEA
} MUh)
} s^TF+d?B
} (YVl5}V
} *6sB$E_y
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堆排序： wj!p6D;;S
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package org.rut.util.algorithm.support; yv=LT~
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import org.rut.util.algorithm.SortUtil; a,b;H(em
Q^$IlzG7i
/** [yM{A<\L
* @author treeroot Ir|Q2$W2^c
* @since 2006-2-2 .;ml[DXH
* @version 1.0 gQ3Co./
*/ 5V!L~#
public class HeapSort implements SortUtil.Sort{ i;;CU9`E2q
ol^V@3[<
/* (non-Javadoc) 7Te`#"
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) \j !JRD+j
*/ SL" ;\[uI
public void sort(int[] data) { /Mb?dVwA
MaxHeap h=new MaxHeap(); O6LZ<}oUR
h.init(data); D-\\L[
for(int i=0;i h.remove(); h@=H7oV7k
System.arraycopy(h.queue,1,data,0,data.length); q{@j$fMt0
} V|zzj[c
IE.JIi^w
private static class MaxHeap{ &>\E >mJ
yS p]+
void init(int[] data){ hV#+joT8i
this.queue=new int[data.length+1]; Izm8 qt=m
for(int i=0;i queue[++size]=data; FKY|xG9
fixUp(size); ..V6U"/
} y;<^[
} gm~Ka%O|F
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private int size=0; 8.HqQ:?&2t
VJ;n0*/
private int[] queue; }C!N$8d,
VFz(U)._
public int get() { ^eQK.B(
return queue[1]; :$."x '
} 0M(\xO
mG@xehH
public void remove() { KArt4+31
SortUtil.swap(queue,1,size--); +Rn]6}5m\
fixDown(1); =Y#)c]`
} XSC._)ztEE
file://fixdown Q+'mBi}
private void fixDown(int k) { 8X!^ 2B}J
int j; M@EML @~
while ((j = k << 1) <= size) { iIji[>qz
if (j < size %26amp;%26amp; queue[j] j++; \72(d
if (queue[k]>queue[j]) file://不用交换 \M(0@#-$C
break; U">w3o|
SortUtil.swap(queue,j,k); ce!0Ws+
k = j; fa9c!xDt
} }/q]:3M|
} 3<sYxA\?w
private void fixUp(int k) { QxG:NN;jW
while (k > 1) { :td6Mywl
int j = k >> 1; :S'P lH
if (queue[j]>queue[k]) T(zERWo
break; rdZk2\<
SortUtil.swap(queue,j,k); BC0SSR@e
k = j; Rl90uF]8
} SE/GT:}
} H"lq!C`
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} T {Q]
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} L]I ;{Y
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SortUtil： ovJwor
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package org.rut.util.algorithm; k/bY>FY2r
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import org.rut.util.algorithm.support.BubbleSort; s<,[xkMB
import org.rut.util.algorithm.support.HeapSort; +I1>; {{
import org.rut.util.algorithm.support.ImprovedMergeSort; L5$r<t<
import org.rut.util.algorithm.support.ImprovedQuickSort; @H[)U/.
import org.rut.util.algorithm.support.InsertSort; 7`-fN|
import org.rut.util.algorithm.support.MergeSort; Ve\^(9n
import org.rut.util.algorithm.support.QuickSort; x[l_dmq
import org.rut.util.algorithm.support.SelectionSort; V ':?rEN|
import org.rut.util.algorithm.support.ShellSort; OSACH0h
1KwUp0%&
/** +Y;/10p
* @author treeroot d$.t0-lC
* @since 2006-2-2 trD-qi
* @version 1.0 W$&{jr-p
*/ Yzo_ZvL
public class SortUtil { O#Y;s;)i"
public final static int INSERT = 1; PNVYW?l
public final static int BUBBLE = 2; 2P)*Y5`KBH
public final static int SELECTION = 3; ^APPWQUl
public final static int SHELL = 4; XL!\Lx
public final static int QUICK = 5; /S9s%scAy
public final static int IMPROVED_QUICK = 6; Qb "\j
public final static int MERGE = 7; !F]7q]g
public final static int IMPROVED_MERGE = 8; hH Kd+QpI
public final static int HEAP = 9; ?[<C,w~$`
>IZ|:lsxE
public static void sort(int[] data) { #a7 Wx}
sort(data, IMPROVED_QUICK); : &! >.Y
} Y\#+-E
private static String[] name={ TNgf96) y
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" |Uf[x[
}; QN!.~>
}M_Yn0(3
private static Sort[] impl=new Sort[]{ B_Qi
new InsertSort(), #$/SM_X14C
new BubbleSort(), h$\+r<
new SelectionSort(), E<=h6Ha
new ShellSort(), s Yp?V\Y"
new QuickSort(), KBVW<;C$
new ImprovedQuickSort(), & QO9/!
new MergeSort(), c:;m BS>~
new ImprovedMergeSort(), ~Ey)9phZK
new HeapSort() `8 Q3=^)3
}; ,V$PV,G
N%3 G\|~Q
public static String toString(int algorithm){ -v]vm3Na
return name[algorithm-1]; kd0~@rPL
} D)0pm?*5A
2y_R05O0
public static void sort(int[] data, int algorithm) { [):&R1U
impl[algorithm-1].sort(data); Glz yFj
} P1\:hh
pxj}%LH
public static interface Sort { NhP&sQO
public void sort(int[] data); SLCV|@G
} j?eWh#[K"
[xaglZ9HNo
public static void swap(int[] data, int i, int j) { \a\J0&Z
int temp = data; %Fb4
data = data[j]; u<}PcI.
data[j] = temp; d5b \kRr
} ;c>Co:W
} |.8lS3C