[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>@AE
} =`UFg>-
int i1=l; *X^C+F
int i2=mid+1; A5Q4wy`
for(int cur=l;cur<=r;cur++){ Ao#bREm
if(i1==mid+1) { SDnVV
data[cur]=temp[i2++]; C_yNSD
else if(i2>r) HE>V\+ AL
data[cur]=temp[i1++]; |9X2AS Qu
else if(temp[i1] data[cur]=temp[i1++]; `?SC.KT
else tH#t8Tq5x
data[cur]=temp[i2++]; HMDuP2Y
} KtArV
} c'mg=jH
\:+ NVIN
} =woP~+
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改进后的归并排序: :jC$$oC].
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package org.rut.util.algorithm.support; mF UsTb]f
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import org.rut.util.algorithm.SortUtil; ewWw
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/** GVfRy@7n
* @author treeroot ddd2w
* @since 2006-2-2 VTY #{
* @version 1.0 1.TIUH1
*/ &Pc.[k
public class ImprovedMergeSort implements SortUtil.Sort { Z4E6J'B8
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private static final int THRESHOLD = 10; cI/}rZ+
h<8c{RuoZC
/* f1sp6S0V\
* (non-Javadoc) $4qM\3x0,
* #2"'tHf4
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 9+/D\|"{
*/ +SW|/oIU
public void sort(int[] data) { MWK)Bn
int[] temp=new int[data.length]; l/"!}wF
mergeSort(data,temp,0,data.length-1); /a)^)
} LROrhO
oOaLD{g>
private void mergeSort(int[] data, int[] temp, int l, int r) { ^bfU>02Q6p
int i, j, k; 53d`+an2
int mid = (l + r) / 2; Cl3L)
if (l == r) d_ x jW
return; MZxU)QW1
if ((mid - l) >= THRESHOLD) '=xO?2U-Z
mergeSort(data, temp, l, mid); L\5:od[EP
else ,Q.[Lc=w
insertSort(data, l, mid - l + 1); TjI&8#AWBA
if ((r - mid) > THRESHOLD) *'tGi_2?(
mergeSort(data, temp, mid + 1, r); S9ic4rcd
else rBi6AM/
insertSort(data, mid + 1, r - mid); K\zb+
}E[vW
for (i = l; i <= mid; i++) { dvz6
temp = data; LC$M_Cpw
} `^ a:1^
for (j = 1; j <= r - mid; j++) { 0AF,} &$
temp[r - j + 1] = data[j + mid]; ]w0Y5H "
} {47Uu%XT
int a = temp[l]; +$#XV@@~
int b = temp[r]; aof'shS8
for (i = l, j = r, k = l; k <= r; k++) { b5I 8jPj4c
if (a < b) { S)W?W}*R\
data[k] = temp[i++]; ecO$L<9>
a = temp; ;PnN$g]Q
} else { R3.w")6
data[k] = temp[j--]; f`_{SU"3
b = temp[j]; f9 :=6
} w'XSkI_ay
} {d]B+'
} :>Qu;Z1P
[>\e@ =
/** adRIg:2
* @param data c5:0`~5Fn
* @param l 5rc3jIXc{|
* @param i 9I$}=&"
*/ :eT\XtxM~{
private void insertSort(int[] data, int start, int len) { fY?:SPR+
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); EyA(W;r.
} qR_Np5nHF
} }Kp$/CYd
} bg_io*K
} @F*z/E}e
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堆排序： 5|>ms)[RQ
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package org.rut.util.algorithm.support; j]`hy"
~D`R"vzw=
import org.rut.util.algorithm.SortUtil; uFhPNR2l
jTZi< Y:bB
/** 9j5|o([J
* @author treeroot GoH.0eQ^
* @since 2006-2-2 dm40qj
* @version 1.0 5wE6gRJ
*/ nh80"Ny5
public class HeapSort implements SortUtil.Sort{ j9GKz1
e'c3.sQ|?
/* (non-Javadoc) q8.Z7ux
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) .F2"tt?'
*/ L{l}G,j<
public void sort(int[] data) { ~l.C-
MaxHeap h=new MaxHeap(); 59v=\; UI
h.init(data); Vpzjh,r-j
for(int i=0;i h.remove(); YC<FKWc
System.arraycopy(h.queue,1,data,0,data.length); xj&~>&U){;
} 6c27X/'Z
2PUB@B' +
private static class MaxHeap{ [;4ak)!
SG&H^V8
void init(int[] data){ f)gV2f0t
this.queue=new int[data.length+1]; yx6^ mis4
for(int i=0;i queue[++size]=data; n "^rS}Y]
fixUp(size); 1vCp<D9<
} 0(9gTxdB
} Xc^(e?L4
;`kOFg#`)c
private int size=0; S4_ZG>\VT
CdcBE.%<
private int[] queue; nD)SR
Y5B!*+h
public int get() { k6Vs#K7a
return queue[1]; 8wZ $Hq
} w^n&S=E E~
9&<c)sS&B
public void remove() { B<h4ZK%
SortUtil.swap(queue,1,size--); (!0_s48f
fixDown(1); *UJB*r
} pU,\ &3N
file://fixdown !=yO72dgLY
private void fixDown(int k) { )te_ <W
int j; 0}'/pN>
while ((j = k << 1) <= size) { !U(KQ:j
if (j < size %26amp;%26amp; queue[j] j++; '%:E4oI
if (queue[k]>queue[j]) file://不用交换 1rU\ !GfR
break; B6\/xKmv?8
SortUtil.swap(queue,j,k); S$R=!3* "V
k = j; eb,QT\/G
} ^h#A7 g
} +iQ~ Y2Gh
private void fixUp(int k) { K;s`
while (k > 1) { ^L Xr4
int j = k >> 1; z&um9rXR
if (queue[j]>queue[k]) `/wXx5n5<
break; vl|3WYA
SortUtil.swap(queue,j,k); 5GPAt
k = j; Vhb~kI!x
} b}u#MU
} P9Eh,j0_
3+:NX6Ewb*
} ~)X;z"y%b
|8x_Av0
} i12G\Ye
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SortUtil： IBNb!mPu%
Y2N$&]O{
package org.rut.util.algorithm; 9c1q:>|
#-R]HLW*
import org.rut.util.algorithm.support.BubbleSort; N "eK9>
import org.rut.util.algorithm.support.HeapSort; vt5>>rl
import org.rut.util.algorithm.support.ImprovedMergeSort; !y!s/i&P%
import org.rut.util.algorithm.support.ImprovedQuickSort; @cm[]]f'l
import org.rut.util.algorithm.support.InsertSort; ^r]-v++
import org.rut.util.algorithm.support.MergeSort; <8Z%'C6d
import org.rut.util.algorithm.support.QuickSort; "/UPq6
import org.rut.util.algorithm.support.SelectionSort; M$f_I +
import org.rut.util.algorithm.support.ShellSort; rfZg
^BI&-bR@
/** 9+5F(pd(
* @author treeroot c]z^(:_>
* @since 2006-2-2 AP=SCq;
* @version 1.0 cmaha%3d
*/ qPhVc9D#
public class SortUtil { AO5a
public final static int INSERT = 1; HJ!)&xT
public final static int BUBBLE = 2; @OHNz!Lj:d
public final static int SELECTION = 3; 'Nx"_jQ
public final static int SHELL = 4; $Df1t
public final static int QUICK = 5; +s [_ 4
public final static int IMPROVED_QUICK = 6; soKR*gJ,
public final static int MERGE = 7; a{?>F&vnU
public final static int IMPROVED_MERGE = 8; o+R(ux"
public final static int HEAP = 9; <!|=_W6
6Hd^qouid
public static void sort(int[] data) { D6e<1W
sort(data, IMPROVED_QUICK); *1>Tc,mb
} _F8-4
private static String[] name={ :b#5cMUe
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" R~N%sn
}; *y>|
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private static Sort[] impl=new Sort[]{ 5pRVA
new InsertSort(), ;hFB]/.v
new BubbleSort(), g)MLgjj
new SelectionSort(), )*o) iN 7l
new ShellSort(), R/^;,.
new QuickSort(), o9v9 bL+X
new ImprovedQuickSort(), ~i}/
new MergeSort(), =)]RD%Oq
new ImprovedMergeSort(), 91#n Aj%
new HeapSort() #e9XU:9@g
}; T(~^X-k
BTE&7/i21
public static String toString(int algorithm){ Me;Nn$'%
return name[algorithm-1]; lPlJL`e
} }yCgd 5+_
uuCVI2|
public static void sort(int[] data, int algorithm) { ,l\D@<F
impl[algorithm-1].sort(data); M49Hm[0(
} VC!g,LU|-
b1ZHfe:
public static interface Sort { qEjsAL
public void sort(int[] data); CR|>?9V
} `R$bx 64
{Z[kvXf"mZ
public static void swap(int[] data, int i, int j) { <R#:K7>O
int temp = data; wKz*)C
data = data[j]; 8[8U49V9(
data[j] = temp; jqoU;u`
} U(:t$SBKy
} #mO.[IuD