[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; wQ%mN[
} [|lB5gi4t!
int i1=l; doB
int i2=mid+1; 4&HXkRs:
for(int cur=l;cur<=r;cur++){ b9"jtRTdz
if(i1==mid+1) ru`U'
data[cur]=temp[i2++]; b]7GmRekl
else if(i2>r) %J8|zKT5t
data[cur]=temp[i1++]; @?[1_g_'P
else if(temp[i1] data[cur]=temp[i1++]; !=y]Sv~h
else rLU/W<F8
data[cur]=temp[i2++]; A"aV'~>
} Dk='+\
} sO5?aB&
;P;((2_X9
} q|%(3,)ig
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改进后的归并排序: 5P .qXA"D
JMCW}bA
package org.rut.util.algorithm.support; qiZO _=0
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import org.rut.util.algorithm.SortUtil; !bC+TYsU
(oJ9k[(
/** `juLQH
* @author treeroot .>(Q)"v
* @since 2006-2-2 1RKW2RCaW_
* @version 1.0 :0/q5_t
*/ siTX_`0
public class ImprovedMergeSort implements SortUtil.Sort { .@"q$\
g!i45-n3gt
private static final int THRESHOLD = 10; *FfMI
up2+s#
/* (Z}>1WRju
* (non-Javadoc) nkv(~ej(
* @vMA=v7a
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) QaGlR`Y
*/ 9 C{;h
public void sort(int[] data) { 4G@nZn
int[] temp=new int[data.length]; \j2;4O?`
mergeSort(data,temp,0,data.length-1); j&UMjI9[
} |ea~'N1
}dxDtqb
private void mergeSort(int[] data, int[] temp, int l, int r) { {ls+dx/
int i, j, k; +p8BGNW,
int mid = (l + r) / 2; W[[bV
if (l == r) Fxc)}i`
return; GdVhK:<>
if ((mid - l) >= THRESHOLD) j,d*?'X
mergeSort(data, temp, l, mid); X1tXqHJF}
else o&hIHfZri
insertSort(data, l, mid - l + 1); Jd,)a#<j
if ((r - mid) > THRESHOLD) f1PN|
mergeSort(data, temp, mid + 1, r); E`j-6:
else i-U4RZE
insertSort(data, mid + 1, r - mid); za'6Y*CGgX
hCYQGx0
for (i = l; i <= mid; i++) { E(Rh#+]Y5
temp = data; =&dW(uyzY
} a{[+<8=@1
for (j = 1; j <= r - mid; j++) { AOp/d(vx5i
temp[r - j + 1] = data[j + mid]; #tdf>?
} WS2osBc
int a = temp[l]; ^Cv^yTj;&
int b = temp[r]; ]l~V&#i_c
for (i = l, j = r, k = l; k <= r; k++) { Sb".]>^
if (a < b) { `d2,*KR
data[k] = temp[i++]; ki;UY~
a = temp; dP]1tAO,y
} else { {m8+Wju}
data[k] = temp[j--]; K={qU[_O
b = temp[j]; OTB$V k
} l$*=<tV
} /$"[k2 N
} QFPfIb/
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/** GO! uwo:
* @param data fWGOP~0
* @param l 3E^M?N2oc
* @param i T88Y qI
*/ QIB>rQCceo
private void insertSort(int[] data, int start, int len) { +]:2\TTGI
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); *FR$vLGn
} qP*}.Sqk7
} utlpY1#q/
} r'BAT3
} 'j%F]CK
#kkY@k$4
堆排序： RE3Z%;'
2h {q h
package org.rut.util.algorithm.support; E3/:.t
6qo^2
import org.rut.util.algorithm.SortUtil; >cL{Ya}Rz
qIwV q!=
/** iF+RnWX\
* @author treeroot p3^jGj@
* @since 2006-2-2 >i,iOx|E-
* @version 1.0 %ICglF R
*/ )<4_:
public class HeapSort implements SortUtil.Sort{ \nrP$
\ u+xa{b|
/* (non-Javadoc) aaWJ* >rJ
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) UFn8kBk
*/ 3b[jwCt
public void sort(int[] data) { |4Ck;gg!j
MaxHeap h=new MaxHeap(); 9O,,m~B
h.init(data); k /EDc533d
for(int i=0;i h.remove(); %bb~Y"
System.arraycopy(h.queue,1,data,0,data.length); ~:sE:9$z
} o[6y+<'o
;/AG@$)
private static class MaxHeap{ CPazEe1S
S(eQ{rSs
void init(int[] data){ Ja^ 5?Ar|
this.queue=new int[data.length+1]; @nV5.r0W}B
for(int i=0;i queue[++size]=data; !{_yaVF
fixUp(size); ;eB ~H[S/
} 9vGs;
} K7vw3UwGN
Y\/gU8w/
private int size=0; |E/L.gdP7
\6j^kY=
private int[] queue; q$ghLGz
\Mx JH[
public int get() { @fn6<3
return queue[1]; &$fbP5uAZ
} = Rc"^oS
`kBnSio~
public void remove() { Ln#a<Rx.E7
SortUtil.swap(queue,1,size--); ,i`h x, Rg
fixDown(1); \Xg?Ug*9w
} )+Or
file://fixdown s'a=_cN
private void fixDown(int k) { fJ80tt?r
int j; %EbiMo ]3B
while ((j = k << 1) <= size) { :9d\Uj,
if (j < size %26amp;%26amp; queue[j] j++; ZKbDp~
if (queue[k]>queue[j]) file://不用交换 Db03Nk>#
break; \ a-CN>
SortUtil.swap(queue,j,k); :pKG\A
k = j; o#i ]"
} j^u[F"
} |DG@ht
private void fixUp(int k) { +/'<z
while (k > 1) { )q?$p9
int j = k >> 1; @] .VQ<X|0
if (queue[j]>queue[k]) Q2'eQ0W{o
break; {/M\Q@j
SortUtil.swap(queue,j,k); r:.uBc&_
k = j; \gKdDS
} $@[)nvV\
} }~enEZ
%JoxYy-
} 6nw&$I
pVokgUrC
} Wpm9`K
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SortUtil： {gkwOMW
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package org.rut.util.algorithm; z&'f/w8
f~gSJ<t4
import org.rut.util.algorithm.support.BubbleSort; Z$2L~j"=!
import org.rut.util.algorithm.support.HeapSort; ]if;A)'
import org.rut.util.algorithm.support.ImprovedMergeSort; 6&!l'[hU
import org.rut.util.algorithm.support.ImprovedQuickSort; (.^8^uc7X
import org.rut.util.algorithm.support.InsertSort; [ #]jC[
import org.rut.util.algorithm.support.MergeSort; z%2w(&1
import org.rut.util.algorithm.support.QuickSort; wL eHQ]
import org.rut.util.algorithm.support.SelectionSort; !]DuZ=
import org.rut.util.algorithm.support.ShellSort; )bW<8f2
X=_Z(;<&
/** kO3`54
* @author treeroot H@!#;w
* @since 2006-2-2 Gp1EJ2d8
* @version 1.0 m6so]xr
*/ )A83A<~
public class SortUtil { ph^4GBR
public final static int INSERT = 1; qC j*>D
public final static int BUBBLE = 2; !kh{9I>M
public final static int SELECTION = 3; q+/l"&j.
public final static int SHELL = 4; |zMqJ.qu
public final static int QUICK = 5; jU$Y>S>l
public final static int IMPROVED_QUICK = 6; m "]!I~jd
public final static int MERGE = 7; AVpuMNd@
public final static int IMPROVED_MERGE = 8; Ow3a0cF[9
public final static int HEAP = 9; 5#u.pu
3X'WR]
public static void sort(int[] data) { eY3=|RR
sort(data, IMPROVED_QUICK); |!b9b(_j9
} ?M"HXu
private static String[] name={ IQ{?_'
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" UX}*X`{
}; 3}4#I_<$F@
@&:VKpu\
private static Sort[] impl=new Sort[]{ )5i*/I\
new InsertSort(), p":@>v?
new BubbleSort(), )k%M.{&bji
new SelectionSort(), u9}!Gq
new ShellSort(), AF[>fMI
new QuickSort(), qBiyGlu4
new ImprovedQuickSort(), x^2 W?<
new MergeSort(), cdp{W
new ImprovedMergeSort(), YX `%A6
new HeapSort() qhxC 5f4Z
}; 0WS|~?OR@
%gTVW!q
public static String toString(int algorithm){ $[QcEk
return name[algorithm-1]; sX~45u \
} 51/sTx<Z}
Vj7Hgc-,
public static void sort(int[] data, int algorithm) { ohTd'+Lm
impl[algorithm-1].sort(data); 9RcM$[~
} r /yHmEk&
>nNl^ yqW
public static interface Sort { T{;=#rG<
public void sort(int[] data); ^je528%H
} KL~AzLI
X!7Xg
public static void swap(int[] data, int i, int j) { }z{wQ\
int temp = data; nk>8SW^
data = data[j]; q(1r<2
data[j] = temp; _=T]PSauI
} + o{*r#
} M\jB)@)