[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; y-#
} xb>n&ym?
int i1=l; NaA+/:
int i2=mid+1; 0[lsoYUq
for(int cur=l;cur<=r;cur++){ gt_XAH
if(i1==mid+1) :wU_-{>>2
data[cur]=temp[i2++]; *v rWA
else if(i2>r) !\0F.*
data[cur]=temp[i1++]; VD24X
else if(temp[i1] data[cur]=temp[i1++]; G*\abL
else xHB/]Vd-
data[cur]=temp[i2++]; 8PBU~mr
} |rFR8srPG
} -2\ZzK0tM
5r4gmy>
} gcg>Gjp
i_u {5 U;
改进后的归并排序: e3eVvl5]
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package org.rut.util.algorithm.support; $(gGoL<
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import org.rut.util.algorithm.SortUtil; Ad;S=h8:
|mxNUo-
/** S<nP80C
* @author treeroot .G}k/`a
* @since 2006-2-2 w<65S
* @version 1.0 PW%1xHLfk
*/ 5g``30:o
public class ImprovedMergeSort implements SortUtil.Sort { WRD A `
[5Fd P0
private static final int THRESHOLD = 10; >?5xDbRj
Sty!atEWT
/* jJ aV
* (non-Javadoc) *bA+]&dj\
* u#+RUtM
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 9g Bjxqm
*/ ?MC(}dF0
public void sort(int[] data) { Xsd$*F@<
int[] temp=new int[data.length]; JI"/N`-?;b
mergeSort(data,temp,0,data.length-1); r<*O
} l"J*)P
\sK:W|yy
private void mergeSort(int[] data, int[] temp, int l, int r) { wE$s'e
int i, j, k; U:]MgZWn
int mid = (l + r) / 2; AkrTfi4hC
if (l == r) c>ad0xce6
return; 1")FWN_K/T
if ((mid - l) >= THRESHOLD) p9-0?(]
mergeSort(data, temp, l, mid); M8';%=@
else G#H9g PY
insertSort(data, l, mid - l + 1); !4R>O6k
if ((r - mid) > THRESHOLD) 74K)aA
mergeSort(data, temp, mid + 1, r); X JY5@I.
else ^qxdmMp)l
insertSort(data, mid + 1, r - mid); *hVb5CS
BeK2;[5C
for (i = l; i <= mid; i++) { Ge~q3"
temp = data; k-"<{V
} ]9jZndgC
for (j = 1; j <= r - mid; j++) { __!m*!sd
temp[r - j + 1] = data[j + mid]; E4+b-?PB~
} $$JIBf8
int a = temp[l]; ll^DY hx}
int b = temp[r]; 4`nqAX~'f
for (i = l, j = r, k = l; k <= r; k++) { ?6i;)eIOI
if (a < b) { 3AURzU
data[k] = temp[i++]; {6'*Phw
a = temp; W`$[j0
} else { <cYp~e%xIw
data[k] = temp[j--]; &hayR_F9
b = temp[j]; cd!|Ne>fe
} W57&\PXYn
} kMy<G8 s
} 2H[ ; v+
{Eu'v$c!
/** FV A UR
* @param data IX9K.f
* @param l 0[/vQ+O]2
* @param i -kl;!:'.3
*/ 14H'!$
private void insertSort(int[] data, int start, int len) { 3gpo %
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); c45tmul
} sAi&A9"*
} `(!NYx
} j 1(T )T
} *>k!hq;j
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堆排序： !.EcP=S
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package org.rut.util.algorithm.support; o(qEkR:4kd
c3] C:t+
import org.rut.util.algorithm.SortUtil; XLm@etf
I}+;ME|<2
/** $jG4pPG
* @author treeroot :#{-RU@PS
* @since 2006-2-2 (/K5!qh
* @version 1.0 D`Gt
*/ ^agj4$
public class HeapSort implements SortUtil.Sort{ H`-=?t
5`~mqqR5
/* (non-Javadoc) vZ@g@zB4o0
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) |3;(~a)%
*/ Ky kSFB
public void sort(int[] data) { D{p5/#|r
MaxHeap h=new MaxHeap(); dQ9 ah
h.init(data); KCUU#t|8V\
for(int i=0;i h.remove(); rB%y6P B
System.arraycopy(h.queue,1,data,0,data.length); |SQ|qbe=
} )11W)G`w
QR"bYQ
private static class MaxHeap{ 6NX3"i0eT
_ h9o@
void init(int[] data){ b`CWp;6Y
this.queue=new int[data.length+1]; ; 0ko@ \Lq
for(int i=0;i queue[++size]=data; %/T7Z;d
fixUp(size); ^s{hs(8%R
} :p>hW!~
} Ma6W@S
ZenPw1-
private int size=0; S`iR9{+&
!>n|c$=;qk
private int[] queue; #Fs|f3-@
"MnSJ2
public int get() { YT=eVg53
return queue[1]; & Kmy}q
} aMTFW_w
^Kqf~yS%
public void remove() { Au.:OeJm
SortUtil.swap(queue,1,size--); eA=WGy@IcN
fixDown(1); YEv Lhh
} k_aW
file://fixdown DM),|Nq"
private void fixDown(int k) { {.CMD9F[
int j; Ei5wel6!
while ((j = k << 1) <= size) { i#W*'
if (j < size %26amp;%26amp; queue[j] j++; 5HKW"=5Cf
if (queue[k]>queue[j]) file://不用交换 [2 zt ^
break; 8IGt4UF&?
SortUtil.swap(queue,j,k); _1|$P|$P.
k = j; *1^$.Q&
} -M4p\6)Ge
} ``|AgIg
private void fixUp(int k) { dE5D3ze
while (k > 1) { >xg5z
int j = k >> 1; uzBz}<M=
if (queue[j]>queue[k]) #NNewzC<*
break; NfzF.{nh
SortUtil.swap(queue,j,k); =o^|bih
k = j; WeMAe w/d
} R7?29?$7
} A:# k
DBsDkkB{
} gfy19c 9
j6g@tx^)'
} 8=;k"
'bu)M1OLi
SortUtil： >t <pFh
OP! R[27>
package org.rut.util.algorithm; t'1Y@e
YF[f Z
import org.rut.util.algorithm.support.BubbleSort; p &(OZJT
import org.rut.util.algorithm.support.HeapSort; N|:'XwL
import org.rut.util.algorithm.support.ImprovedMergeSort; H?`g!cX
import org.rut.util.algorithm.support.ImprovedQuickSort; k<j"~S1
import org.rut.util.algorithm.support.InsertSort; x,8<tSW)Z
import org.rut.util.algorithm.support.MergeSort; ;inzyFbL=
import org.rut.util.algorithm.support.QuickSort; p_2pU)%
import org.rut.util.algorithm.support.SelectionSort; DWiBG
import org.rut.util.algorithm.support.ShellSort; L":bI&V?:
_P7tnXww
/** 1S:|3W
* @author treeroot CN&
* @since 2006-2-2 *>q/WLR
* @version 1.0 sZhMa>
*/ 'Ot,H_pE
public class SortUtil { a|_p,_
public final static int INSERT = 1; 9YN?
public final static int BUBBLE = 2; @jy41eIo
public final static int SELECTION = 3; K#mOSY;}
public final static int SHELL = 4; \7v)iG|#G&
public final static int QUICK = 5; QM<y`cZ8
public final static int IMPROVED_QUICK = 6; .Y*f2A.v
public final static int MERGE = 7; aP-<4uGx
public final static int IMPROVED_MERGE = 8; S* R,FKg
public final static int HEAP = 9; 7 sFz?`-
y$W|~ H
public static void sort(int[] data) { G"dS+,Q
sort(data, IMPROVED_QUICK); r[txlQI9
} GK*v{`
private static String[] name={ {+.r5py
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" |L6&Gf]#5
}; S:bC[}
aelO3'UN
private static Sort[] impl=new Sort[]{ _5Bcwa/
new InsertSort(), &^".2)zU
new BubbleSort(), ,*svtw:2')
new SelectionSort(), !Ng=Yk>3
new ShellSort(), ~P*4V]L^
new QuickSort(), /t%u"dP"T~
new ImprovedQuickSort(), O9M{ ).
new MergeSort(), 0s#Kp49-
new ImprovedMergeSort(), s5&@Cxzl
new HeapSort() `~BZ1)@
}; ,e722wz
NH A5e<
public static String toString(int algorithm){ b1#dz]
return name[algorithm-1]; e [h8}F
} 1bnBji
c=O,;lWFqm
public static void sort(int[] data, int algorithm) { w'Tq3-%V
impl[algorithm-1].sort(data); -~{c u47_
} g"VMeW^
dl-l"9~;
public static interface Sort { b7`D|7D
public void sort(int[] data); u{<"NR h
} d3Mva,bw<
G3i !PwW
public static void swap(int[] data, int i, int j) { =+:{P?*}
int temp = data; :mppv8bh
data = data[j]; -Z-f1.Dm5
data[j] = temp; )u%je~Vw
} ~&dyRtW4
} feM6K!fL`