[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,g!KN3P
} %f, 9
int i1=l; cZ o]*Gv.
int i2=mid+1; a1om8!C
for(int cur=l;cur<=r;cur++){ e6{/e+/R
if(i1==mid+1) VsUEp_I
data[cur]=temp[i2++]; '!En,*'IS
else if(i2>r) "jAV7lP
data[cur]=temp[i1++]; 7E|0'PPR
else if(temp[i1] data[cur]=temp[i1++]; (&X"~:nm2
else GK\'m@k
data[cur]=temp[i2++]; |=GRPvvi
} pY-izML
} |nocz]yU$
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} &Vl,x/
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改进后的归并排序: }S%a]
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package org.rut.util.algorithm.support; ,j2qY'wi
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import org.rut.util.algorithm.SortUtil; in B}ydk
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/** U>X06T
* @author treeroot <2,@rYe/
* @since 2006-2-2 93YD\R+q
* @version 1.0 >%d]"]
*/ -6)ywq^{z
public class ImprovedMergeSort implements SortUtil.Sort { YM#XV*P0 q
'8%aq8
private static final int THRESHOLD = 10; ~ocd4,d=
OE:t!66
/* [IW@mn>
* (non-Javadoc) E1VCm[j2
* ?F`lI""E
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) H&%=>hyX
*/ =XoNk1
public void sort(int[] data) { Kji}2j'a
int[] temp=new int[data.length]; @#o$~'my
mergeSort(data,temp,0,data.length-1); eIg2m <9u
} @W^g(I(w
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private void mergeSort(int[] data, int[] temp, int l, int r) { c*\^61T
int i, j, k; yv'mV=BMJ!
int mid = (l + r) / 2; <5L!.Ci
if (l == r) $ar:5kif
return; 8t6h^uQ
if ((mid - l) >= THRESHOLD) {d )Et;_
mergeSort(data, temp, l, mid); .# M5L
else #|$7. e
insertSort(data, l, mid - l + 1); oNiS"\t
if ((r - mid) > THRESHOLD) !3T x\a`?/
mergeSort(data, temp, mid + 1, r); %/UQ0d~b
else KAUYE^
insertSort(data, mid + 1, r - mid); 9:BGA/?
2RM1-j ($
for (i = l; i <= mid; i++) { gqe z-
temp = data; 8V4Qyi|@F
} c&R.
for (j = 1; j <= r - mid; j++) { .+B!mmp
temp[r - j + 1] = data[j + mid]; vtvr{Uqo@
} O4-UVxv}
int a = temp[l]; {5_*f)$[H
int b = temp[r]; -j<UhW
for (i = l, j = r, k = l; k <= r; k++) { wmoOp;C
if (a < b) { \HH|{
data[k] = temp[i++]; ]Q,RVEtKp
a = temp; i%\nJs*
} else { 4+ 4?0R
data[k] = temp[j--]; X>Xpx<RY!
b = temp[j]; g%\e80~1(
} pp{%\td
} I5 2wTl0
} MvRuW:
*|`'L
/** ~I'Z=Wo
* @param data *X<De
* @param l bNL E=#ro
* @param i r&TxRsg{
*/ hSg:Rqnk
private void insertSort(int[] data, int start, int len) { $9b||L
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); IA+>dr
} E!Ng=}G&_
} 6 a$%
} tB1Qr**
} _IY)<'d
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堆排序： Gn_v}31d%
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package org.rut.util.algorithm.support; &0ULj6jj
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import org.rut.util.algorithm.SortUtil; uM4,_)L
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/** _l/6Qpf
* @author treeroot a%-Yl%#
* @since 2006-2-2 *:d_~B?Tn
* @version 1.0 :A 1,3g
*/ `rs1!ZJ,
public class HeapSort implements SortUtil.Sort{ tPp}/a%D
*Pq`~W_M7
/* (non-Javadoc) >#8`Zy:/Y
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 1 9)78kV{
*/ Q!|71{5U
public void sort(int[] data) { / Sp+MB9
MaxHeap h=new MaxHeap(); pkM32v-
h.init(data); !BQ!]u
for(int i=0;i h.remove(); 95(VY)_6#A
System.arraycopy(h.queue,1,data,0,data.length); S)[2\Z{**T
} Xt~/8)&
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private static class MaxHeap{ :m+:%keK
W``e6RX-
void init(int[] data){ ")o.x7~N
this.queue=new int[data.length+1]; $iF7hyZ
for(int i=0;i queue[++size]=data; 9r)5d&,6
fixUp(size); |]B]0J#_
} $~9U-B\
} ( NiuAy
oYqC"g&4Z
private int size=0; "\V:W%23W{
`[ne<F?e
private int[] queue; .t}nznh
UbuxD})
public int get() { wicg8[T=B
return queue[1]; }M9'N%PU
} =+"XV8Fi,
m1`ln5(R
public void remove() { "/\:Fdc^
SortUtil.swap(queue,1,size--); g6*}&.&
fixDown(1); hpw;w}m
} Dic(G[
file://fixdown E]7G4
private void fixDown(int k) { /_56H?w\
int j; +nqOP3
while ((j = k << 1) <= size) { JUXK}0d%eN
if (j < size %26amp;%26amp; queue[j] j++; o= 8yp2vG
if (queue[k]>queue[j]) file://不用交换 ',CcLN
break; AM}OLHj
SortUtil.swap(queue,j,k); %_3{Db`R>
k = j; Lh. L~M1X
} h7Ma`w\-
} 3+#bkG
private void fixUp(int k) { 3yZ@i<rfH
while (k > 1) { Q.8Jgel1
int j = k >> 1; 7*4F-5G/
if (queue[j]>queue[k]) ;aFQP:l/
break; I4");T3
SortUtil.swap(queue,j,k); :r~?Z6gK
k = j; y[$e]N
} RSkpf94`
} r2hm`]\8M
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} i\PN
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} g|T' oK
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SortUtil： #}vcffgZ
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package org.rut.util.algorithm; ?Dfgyz
*X)OdU
import org.rut.util.algorithm.support.BubbleSort; B)c.`cfr*\
import org.rut.util.algorithm.support.HeapSort; #6YNgJNk
import org.rut.util.algorithm.support.ImprovedMergeSort; a-kU?&* y
import org.rut.util.algorithm.support.ImprovedQuickSort; M$?~C~b!*
import org.rut.util.algorithm.support.InsertSort; 2h/`RefHJ
import org.rut.util.algorithm.support.MergeSort; MW&;{m?2(
import org.rut.util.algorithm.support.QuickSort; ~o8$/%Oeb/
import org.rut.util.algorithm.support.SelectionSort; 7aU*7!U
import org.rut.util.algorithm.support.ShellSort; ]w')~yk
_=cMa's
/** FB</~ g
* @author treeroot "OWq]q#
* @since 2006-2-2 1f~DUku=
* @version 1.0 2R1W[,Ga!
*/ +-{HT+W
public class SortUtil { K3@UoR
public final static int INSERT = 1; t[DXG2&
public final static int BUBBLE = 2; )X7ZX#ttH
public final static int SELECTION = 3; mM95BUB
public final static int SHELL = 4; c5]1aFKz
public final static int QUICK = 5; PVvG
public final static int IMPROVED_QUICK = 6; &-{4JSII
public final static int MERGE = 7; <ZnAPh
public final static int IMPROVED_MERGE = 8; t<`BaU
public final static int HEAP = 9; OgzPX^q/=
DG& kY+
public static void sort(int[] data) { MqNp*n2
sort(data, IMPROVED_QUICK); i.'f<z$<
} XBDlQe|>
private static String[] name={ Oc"2|X
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" SIg=_oa
}; E>7[ti_p5
C f<,\Aav
private static Sort[] impl=new Sort[]{ T{ojla(
new InsertSort(), ]6(NeS+
new BubbleSort(), A\?O5#m:$
new SelectionSort(), ;,F}!R
new ShellSort(), 3c ^_IuW-
new QuickSort(), bS0LjvY9g
new ImprovedQuickSort(), >uI|S
new MergeSort(), Kj}}O2
new ImprovedMergeSort(), }F\0Bl&
new HeapSort() ap=_odW~p
}; rfK%%-
~Ipl'cE
public static String toString(int algorithm){ :,cSEST
return name[algorithm-1]; `4$" mO>+
} 0BBWuNF.
qUVV374N
public static void sort(int[] data, int algorithm) { {=&pnu\
impl[algorithm-1].sort(data); ^6obxwVG
} 0t<TZa]V
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public static interface Sort { bhFzu[B
public void sort(int[] data); o05) I2
} d F),
gB&'MA!
public static void swap(int[] data, int i, int j) { ?6a:!^eL
int temp = data; 6r^(VT
data = data[j]; =b6Q2s,i
data[j] = temp; \.}* s]6
} 5Rc 5/m
} *}LYMrP