[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; j^Ln\N]^
} \~T&C5
int i1=l; !6J+#
int i2=mid+1; f=>iiv
for(int cur=l;cur<=r;cur++){ q=k[]vD
if(i1==mid+1) ?u{D-by%&
data[cur]=temp[i2++]; Pj7MR/AH
else if(i2>r) D)eRk0iC
data[cur]=temp[i1++]; # tU@\H5kN
else if(temp[i1] data[cur]=temp[i1++]; De49!{\a
else FuP~_ E~
data[cur]=temp[i2++]; = Fwzm^}6
} $-n_$jLY
} jZ?^ |1
UFj/Y;
} $o*p#LU
?1H>k<Jp
改进后的归并排序: jG,^~5x
K` <`l
package org.rut.util.algorithm.support; -B:O0;f
:]`JcJ
import org.rut.util.algorithm.SortUtil; B,A\/%<
'~pZj"uy
/** ^!K 8nW{*
* @author treeroot E{'\(6z_
* @since 2006-2-2 (=tu~ ^
* @version 1.0 8qs8QK
*/ rU7t~DKS
public class ImprovedMergeSort implements SortUtil.Sort { 9|>5;Ej
B(pHo&ox
private static final int THRESHOLD = 10; U> {CG+X
31mlnDif
/* rmdG"s
* (non-Javadoc) DE$T1pFV
* N||s#
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) [Ib17#74
*/ u6/;=]0
public void sort(int[] data) { 0Pg@%>yb~
int[] temp=new int[data.length]; V`LW~P;
mergeSort(data,temp,0,data.length-1); o q cu<]
} >V@,K z1
w%kaM=
private void mergeSort(int[] data, int[] temp, int l, int r) { %&4\'lE
int i, j, k; Xgo`XsA
int mid = (l + r) / 2; }Q{4G
if (l == r) C,5Erb/
return; Cta!"=\
if ((mid - l) >= THRESHOLD) C] |m|`
mergeSort(data, temp, l, mid); $)7Af6xD
else |bjLmGb
insertSort(data, l, mid - l + 1); ,jMV #H[
if ((r - mid) > THRESHOLD) s;:quM
mergeSort(data, temp, mid + 1, r); 4?~Ei[KgQn
else #EO],!JM
insertSort(data, mid + 1, r - mid); 13I~
lziC.Dpa
for (i = l; i <= mid; i++) { Mm#=d?YUHJ
temp = data; MZSyu
} ~;nW+S$o
for (j = 1; j <= r - mid; j++) { [,mcvO;
temp[r - j + 1] = data[j + mid]; Ht%O9v
} \MtdT[*
int a = temp[l]; ]w9syz8X
int b = temp[r]; W7 9.,#
for (i = l, j = r, k = l; k <= r; k++) { Bqb3[^;~
if (a < b) { M,N(be-
data[k] = temp[i++]; qAuq2pHA+d
a = temp; v5`Odbc=w
} else { Tq5F'@e
data[k] = temp[j--]; Y^uYc}
b = temp[j]; 8j!(*'J.
} p9iCrqi
} _ 4+=S)$
} ]Oe[;<I
-!ERe@k(
/** SP5t=#M6
* @param data u5dyhx7
* @param l \EEU G^T
* @param i ~8G cWy6
*/ ~sc@49p
private void insertSort(int[] data, int start, int len) { |n.ydyu`
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); |b)N;t
} O;<YLS^|6
} ,5Tw5<S
} $a+)v#?,
} x8*@<]!
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堆排序： j_~lc,+m
Cl3hpqv1I
package org.rut.util.algorithm.support; c)=UX_S!
[KwwhI@3
import org.rut.util.algorithm.SortUtil; QjwCY=PK!
Q@#Gm9m
/** G3t 4$3|
* @author treeroot 0B~Q.tyP
* @since 2006-2-2 @7<m.?A!
* @version 1.0 >eaK@u-'0
*/ g].hL
public class HeapSort implements SortUtil.Sort{ =;A~$[g
~b{j`T
/* (non-Javadoc) u+uu?.bM
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) {1`n^j(>
*/ .[#bOp*
public void sort(int[] data) { &M^FA=J\
MaxHeap h=new MaxHeap(); f*~z|
h.init(data); dCM*4B<
for(int i=0;i h.remove(); >@U lhJtW
System.arraycopy(h.queue,1,data,0,data.length); 4WV)&50
} ) XHcrm&
_i{4 4zE
private static class MaxHeap{ VR0#"
H[8P]"*z*i
void init(int[] data){ oM#S.f?
this.queue=new int[data.length+1]; ^7~w yAr
for(int i=0;i queue[++size]=data; .:#6dG\0z
fixUp(size); YJ^TO\4WM
} @Ao E>
} jj 9eFB
"t"&6\
private int size=0; >zAI#N4
k|T0Bly3P
private int[] queue; kXbdR
!4G<&hvb
public int get() { H=k*;'
return queue[1]; v;@-bED(Qs
} yLlAK,5P0o
7oI^shk
public void remove() { CVFsp>+
SortUtil.swap(queue,1,size--); TID0x/j"K5
fixDown(1); }ZWeb#\
} o(@F37r{?
file://fixdown <=,KP)
private void fixDown(int k) { >h m<$3
int j; 1"CbuV 6
while ((j = k << 1) <= size) { %U)M?UNjw
if (j < size %26amp;%26amp; queue[j] j++; i@ avm7
if (queue[k]>queue[j]) file://不用交换 L~FE;*>7
break; g#ONtY@*U
SortUtil.swap(queue,j,k); F-n1J?4b
k = j; AFSFXPl "
} ?k:i3$
} 4x:Odt5
private void fixUp(int k) { =`]yq;(C7j
while (k > 1) { cAc i2e
int j = k >> 1; ~L'}!' &.
if (queue[j]>queue[k]) v+*l|!v
break; }`9}Q O
SortUtil.swap(queue,j,k); r8~U@$BBK
k = j; ?iBHJ{
} 2v<[XNX
} b#C"rTw
4&/-xg87(
} t%AW0#TZ
*7I=vro
} 7>m#Y'ppl@
+6{KrREX)
SortUtil： U)p P^:|
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package org.rut.util.algorithm; "zO+!h'o
i4"xvLK4
import org.rut.util.algorithm.support.BubbleSort; FBPT@`~v
import org.rut.util.algorithm.support.HeapSort; a|\_'#
import org.rut.util.algorithm.support.ImprovedMergeSort; ~>)GW
import org.rut.util.algorithm.support.ImprovedQuickSort; iV71t17
import org.rut.util.algorithm.support.InsertSort; G?/1 F1
import org.rut.util.algorithm.support.MergeSort; {hM*h(W~3
import org.rut.util.algorithm.support.QuickSort; 7c6-S@L
import org.rut.util.algorithm.support.SelectionSort; }r/L 9
import org.rut.util.algorithm.support.ShellSort; T8FKa4ikn
'vTD7a^
/** gGU3e(!Uc
* @author treeroot kc8T@5+I0
* @since 2006-2-2 x9HA^Rj4-
* @version 1.0 +* )Qi)
*/ Q_#X*I
public class SortUtil { 3Pp*ID
public final static int INSERT = 1; UgJ^NF2w
public final static int BUBBLE = 2; 1p&?MxLN-a
public final static int SELECTION = 3; <96ih$5D1
public final static int SHELL = 4; /7h%sCX
public final static int QUICK = 5; <S0!$.Kg*<
public final static int IMPROVED_QUICK = 6; ki^[~JS>'
public final static int MERGE = 7; 1)NX;CN
public final static int IMPROVED_MERGE = 8; M42D5|tZc
public final static int HEAP = 9; W^&t8d2
s:cS 9A8
public static void sort(int[] data) { 4aB`wA^x
sort(data, IMPROVED_QUICK); Ye!=
} #D+Fq^="P
private static String[] name={ ce=6EYl
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" ^O\tN\g;c
}; xyz-T1ib
,l7ty#j
private static Sort[] impl=new Sort[]{ :eQxdi'
new InsertSort(), Q:VD2<2
new BubbleSort(), `Xmpm4 ]
new SelectionSort(), ? *I9
new ShellSort(), |_[mb(<|
new QuickSort(), WM=kr$/3
new ImprovedQuickSort(), W {dx\+
new MergeSort(), V|?
new ImprovedMergeSort(), #^#)OQq]
new HeapSort() 6o A0a\G'
}; ]\r~"*TZ
Z/x<U.B
public static String toString(int algorithm){ e$>5GM
return name[algorithm-1]; {/0,lic
} 5-mJj&0:!
4VU5}"<
public static void sort(int[] data, int algorithm) { J?%D4AeS]v
impl[algorithm-1].sort(data); J;T_9
} 5K6_#g4"
053W2Si
public static interface Sort { LK:|~UV?
public void sort(int[] data); rX{|]M":T
} & vLX
{&h&:
public static void swap(int[] data, int i, int j) { =$`DBLX
int temp = data; p-(Z[G*
data = data[j]; Fsq S)
data[j] = temp; vCpi|a_eCu
} 09%eaoW
} =v;-{oN!