[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; ']OT7)_
} Hf30ve}
int i1=l; *Id[6Z
int i2=mid+1; RgM=g8}M
for(int cur=l;cur<=r;cur++){ @|'9nPern
if(i1==mid+1) kKC] n
data[cur]=temp[i2++]; Sb)}
else if(i2>r) {sq:vu@NC
data[cur]=temp[i1++]; a/%qn-i|p
else if(temp[i1] data[cur]=temp[i1++]; s,Fts3+
else $V/Ke
data[cur]=temp[i2++]; b1."mT!p
} wW<u)|>ye
} uX1{K%^<TW
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} @XcrHnH9
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改进后的归并排序: ;~`/rh V\
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package org.rut.util.algorithm.support; <fMQ#No
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import org.rut.util.algorithm.SortUtil; PVmePgF
>.XXB 5a
/** x{rjngp2
* @author treeroot Q yQ[H
* @since 2006-2-2 \y7Gi}nI
* @version 1.0 >+:cTQ|q
*/ u:wijkx
public class ImprovedMergeSort implements SortUtil.Sort { xKepZ
sY]pszjT
private static final int THRESHOLD = 10; {q~N$"#
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/* F hyY+{%
* (non-Javadoc) mFd|JbW
* 5,Co(K
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) jz\>VYi(7
*/ ,bB}lU)
public void sort(int[] data) { plNw>rFa
int[] temp=new int[data.length]; iI*qx+>f?
mergeSort(data,temp,0,data.length-1); 7|!Zx-}
} #TeAw<2U
``rYzj_
private void mergeSort(int[] data, int[] temp, int l, int r) { <0jM07\<
int i, j, k; AthR|I|8
int mid = (l + r) / 2; Ch~y;C&e+r
if (l == r) ^ $N3.O.
return; yv)-QIC3
if ((mid - l) >= THRESHOLD) /7-FVqDx8
mergeSort(data, temp, l, mid); 'Q.5`o
else 0AhUH|]
insertSort(data, l, mid - l + 1); k#p6QAhS
if ((r - mid) > THRESHOLD) 'RV wxd
mergeSort(data, temp, mid + 1, r); A43[i@o
else Kc>Rd
insertSort(data, mid + 1, r - mid); \vW'\}
{L M Q
for (i = l; i <= mid; i++) { )"E1/$*k
temp = data; %GMCyT
} C MGDg}
for (j = 1; j <= r - mid; j++) { ;H?tcb*
temp[r - j + 1] = data[j + mid]; :8?l=B9("g
} /6y;fx
int a = temp[l]; V[7D4r.j
int b = temp[r]; A\.{(,;kp
for (i = l, j = r, k = l; k <= r; k++) { I3}I7oc_
if (a < b) { [Qqss8a
data[k] = temp[i++]; ZiaFByLy
a = temp; ,z+n@sUR:
} else { V.ae 5@;
data[k] = temp[j--]; KHeeB`V>J
b = temp[j]; 7!6v4ZA
} y+Bxe)6^V
} +.*=Fn22
} "!D,9AkZS
=:H EF;!
/** tS,AS,vy]
* @param data 8N`Rf;BM
* @param l >aCY
* @param i 5R1?jlm
*/ Ve40H6Ox
private void insertSort(int[] data, int start, int len) { ]2iEi`"[
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); SxX
} iU#"G" &
} }0OQm?xh
} bhfC2@
} '\"5qB
81)i>]
堆排序： @U =~c9
Z)}2bJwA
package org.rut.util.algorithm.support; sAF="uB
t\n'Kuk`
import org.rut.util.algorithm.SortUtil; 2>Qy*
}CrWmJu0
/** i=V2 /W}
* @author treeroot jk%H+<FU`
* @since 2006-2-2 k<rJm P{
* @version 1.0 acj-*I
*/ 3u,B<
public class HeapSort implements SortUtil.Sort{ M L7vP
+\>op,_9I
/* (non-Javadoc) >U]KPL[%
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) TA~ZN^xI
*/ k#8E9/t@
public void sort(int[] data) { GB)< 5I
MaxHeap h=new MaxHeap(); w)/~Gn676
h.init(data); y%<CkgZS
for(int i=0;i h.remove(); NA#,q 8
System.arraycopy(h.queue,1,data,0,data.length); ZRFHs>0
} 1_M}Dc+J
*mW2vJ/B
private static class MaxHeap{ =pnQ?2Og
LFvZ 7M\\
void init(int[] data){ ( F4c0
this.queue=new int[data.length+1]; IL"N_ux~w~
for(int i=0;i queue[++size]=data; n ON]YDg
fixUp(size); bb-u'"5^]
} \\`(x:\
} *lQa^F
}!m}?
private int size=0; R pT7Nr
9H+Q/Q*-a
private int[] queue; qtFHA+bO
zqp>Xw
public int get() { @\a~5CLN
return queue[1]; ciFqj3JS
} t8*NldC
Uyd'uC
public void remove() { <@Y`RqV+
SortUtil.swap(queue,1,size--); ^S!;snhn
fixDown(1); + 7wMM#z
} .sKfwcYu4
file://fixdown r4b-.>w
private void fixDown(int k) { |AS<I4+&
int j; j@{dsS:6
while ((j = k << 1) <= size) { S,vdd7Y
if (j < size %26amp;%26amp; queue[j] j++; 'c3'eJ0
if (queue[k]>queue[j]) file://不用交换 (ki= s+W-
break; m!]J{OGG:
SortUtil.swap(queue,j,k); ACpecG
k = j; Fe.90)
} be?Bf^O>
} {$v^2K'C
private void fixUp(int k) { `oM'H+
while (k > 1) { pX1Us+%
int j = k >> 1; 1X9J[5|ll
if (queue[j]>queue[k]) zU_dk'&,
break; lR]FQnZ
SortUtil.swap(queue,j,k); M0`1o p1
k = j; Qraa0]56
} dqO]2d
} s-~`Ao' <
-"?~By}<C
} `g0^W/j
sd =bw
} q$Ms7`a
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SortUtil： k$pND,Ws
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package org.rut.util.algorithm; 7NnXt'
>7~,w1t
import org.rut.util.algorithm.support.BubbleSort; r|i)
import org.rut.util.algorithm.support.HeapSort; 'pB?
import org.rut.util.algorithm.support.ImprovedMergeSort; NQqNBI?cr
import org.rut.util.algorithm.support.ImprovedQuickSort; tD4-Llj6
import org.rut.util.algorithm.support.InsertSort; QS1lg
import org.rut.util.algorithm.support.MergeSort; b~@+6?
import org.rut.util.algorithm.support.QuickSort; *zW]IQ'A
import org.rut.util.algorithm.support.SelectionSort; kp#XpcS
import org.rut.util.algorithm.support.ShellSort; 9<3fH J?vq
2b-g`60<
/** $\bVu2&I
* @author treeroot JAT%s %UC
* @since 2006-2-2 NytodVZ'3
* @version 1.0 ~$hR:I1
*/ {7;QZk(
public class SortUtil { o2q-x2uB
public final static int INSERT = 1; R.vOYzo
public final static int BUBBLE = 2; };<?W){!H
public final static int SELECTION = 3; AlkHf]oB
public final static int SHELL = 4; uX]]wj-R3
public final static int QUICK = 5; XODp[+xEEt
public final static int IMPROVED_QUICK = 6; WNKg>$M
public final static int MERGE = 7; w.#z>4#3-
public final static int IMPROVED_MERGE = 8; TQ0ZBhd
public final static int HEAP = 9; 7AWq3i{
$Sa7N%D
public static void sort(int[] data) { rBy0hGx
sort(data, IMPROVED_QUICK); 1LAd5X
} OK YbEn#
private static String[] name={ .yFO] r1aL
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" E'5KJn;_7
}; Z:es7<#y
~*<`PDO?
private static Sort[] impl=new Sort[]{ ,np|KoG|M
new InsertSort(), 'cQ,;y
new BubbleSort(), w{So(AF
new SelectionSort(), %[M0TE=J
new ShellSort(), hw*u.46
new QuickSort(), 3IB9-wG
new ImprovedQuickSort(), A1`6+8}o;b
new MergeSort(), &m GU
new ImprovedMergeSort(), \okv}x^L=Z
new HeapSort() d|9]E&;,
}; @^ *62
;[[6[i
public static String toString(int algorithm){ 8#- Nx]VM
return name[algorithm-1]; $5&~gHc,
} cMnN} '
FQ`1c[M@
public static void sort(int[] data, int algorithm) { *+2_!=4V
impl[algorithm-1].sort(data); a1/+C$ oB
} 9=}[~V n
cAot+N+9|]
public static interface Sort { pV_zePyOn
public void sort(int[] data); S]~5iO_bst
} qu dY9_
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public static void swap(int[] data, int i, int j) { MPy><J
int temp = data; yXv@yn
data = data[j]; a?8)47)
data[j] = temp; qSG0TWD!pq
} z,7;+6*=L
} \%.oi@A