[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; NW/RQ(
} ^yO+-A2zC
int i1=l; h)W?8XdM
int i2=mid+1; Fp)+>oT
for(int cur=l;cur<=r;cur++){ [hLSK-K 9
if(i1==mid+1) 7XZ5CX&
data[cur]=temp[i2++]; $\W|{u`
else if(i2>r) VSK!Pc.G}
data[cur]=temp[i1++]; v<*ga7'S
else if(temp[i1] data[cur]=temp[i1++]; 1eg/<4]hA
else CXb-{|I}d
data[cur]=temp[i2++]; 7*!h:rg
} xq?9w$
} rmX'Ym9#
]BY^.!Y
} cJ6n@\
uxGY/Zf
改进后的归并排序: 7e{w)m:A
5hVp2w-
package org.rut.util.algorithm.support; GI&XL'K&
\S[7-:Lu^
import org.rut.util.algorithm.SortUtil; E>/kNl
U]Iypl`l
/** 0i76(2
* @author treeroot SJYy,F],V"
* @since 2006-2-2 QKj-"y[
* @version 1.0 `N+A8
*/ bNUb
public class ImprovedMergeSort implements SortUtil.Sort { mkA1Sh{hX>
//SH=>w2
private static final int THRESHOLD = 10; x@-bY
aoLYw 9
/* g4NxNjM;
* (non-Javadoc) }U)g<Kzh
* Lo'P;Sb4<}
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) =}:9y6QR.
*/ &f}a`/{@
public void sort(int[] data) { ZnX]Q+w
int[] temp=new int[data.length]; 6Un61s
mergeSort(data,temp,0,data.length-1); -h5yg`+1N\
} q*^Y8s~3I
$=7'Cm?
private void mergeSort(int[] data, int[] temp, int l, int r) { 4LO U[D
int i, j, k; J! ;g.q
int mid = (l + r) / 2; '6^20rj
if (l == r) NWuJ&+gcO5
return; J&64tQl*
if ((mid - l) >= THRESHOLD) bCM&Fe0GM
mergeSort(data, temp, l, mid); 8hx4s(1!
else 0!WF,)/T7i
insertSort(data, l, mid - l + 1); h$#QRH
if ((r - mid) > THRESHOLD) K`=O!;
mergeSort(data, temp, mid + 1, r); VDCG 5QP6(
else '=|2, H]
insertSort(data, mid + 1, r - mid); =B}a +0u!
#WBlEVx;Z
for (i = l; i <= mid; i++) { _JlbVe[<
temp = data; taS2b#6\+
} BPp`r_m8w}
for (j = 1; j <= r - mid; j++) { k4|9'V&1*6
temp[r - j + 1] = data[j + mid]; vqq7IV)|
} [dm&I#m=
int a = temp[l]; kB|jN~
int b = temp[r]; 111s%
for (i = l, j = r, k = l; k <= r; k++) { #cG7h(!
if (a < b) { XcoV27
data[k] = temp[i++]; mv7><C
a = temp; OnNWci|7
} else { `>M-J-J
data[k] = temp[j--]; m).S0
b = temp[j]; QvM+]pdR6
} (=v :@\r
} ` u#'
} p0 @,-
`[hc{ynO|
/** Nm{\?
* @param data .ZuRH_pI
* @param l r(ej=aR
* @param i )E--E+j
*/ )ZxDfRjL
private void insertSort(int[] data, int start, int len) { Xb0$BAP
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); 72hN%l
} d|GQZAEJEt
} (w31W[V'#
} V3%"z
} 3;M7^DM
<eU1E}BDQ
堆排序： rToZN!q\S
.\r=1HZ3
package org.rut.util.algorithm.support; 9FB[`}
yN9k-IPI
import org.rut.util.algorithm.SortUtil; iV h^;
"m*.kB)e7
/** U(lcQC`$
* @author treeroot R+'$V$g\X
* @since 2006-2-2 YCv)DW;
* @version 1.0 Tr}z&efY
*/ 6OBe^/ZRt
public class HeapSort implements SortUtil.Sort{ d~i WV6Va
?gknJ:
/* (non-Javadoc) _a;E>
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) I r8,=
*/ ]_Cm 5Z7
public void sort(int[] data) { Y7WxV>E
MaxHeap h=new MaxHeap(); 'r&az BO
h.init(data); G,tJ\xMw8
for(int i=0;i h.remove(); v"nN[_T
System.arraycopy(h.queue,1,data,0,data.length); (IlHg^"
} .YV{wL@cB
*&WkorByW
private static class MaxHeap{ #BB,6E
P$YY4|`
void init(int[] data){ m:kXr^!D
this.queue=new int[data.length+1]; YX A|1
for(int i=0;i queue[++size]=data; []i/\0C^
fixUp(size); 20 <$f
} G`n|fuv
} 4@2<dw|*h
bsfYz
private int size=0; kF%EJuu
U_s3)/'
private int[] queue; [i[*xf-B
#Tc]L<."
public int get() { 8fV.NCyE
return queue[1]; o1Bn^w
} nWfzwXP>_
oXC|q-(C
public void remove() { bjn: e!}
SortUtil.swap(queue,1,size--); #[ei/p
fixDown(1); /_WAF90R?
} $Hw w
file://fixdown %bu$t,
private void fixDown(int k) { C%2BDj
int j; _?]0b7X
while ((j = k << 1) <= size) { ~lBb%M
if (j < size %26amp;%26amp; queue[j] j++; g=Gd|
if (queue[k]>queue[j]) file://不用交换 l ga%U~
break; 0ge"ISK
SortUtil.swap(queue,j,k); [&_7w\m
k = j; RIhu9W
} JD`IPQb~E
} Q6Ay$*y=D
private void fixUp(int k) { ///
while (k > 1) { C bWz;$r
int j = k >> 1; AnF"+<
if (queue[j]>queue[k]) Sb2hM~
break; /+V}.
SortUtil.swap(queue,j,k); _Y{8FN(4
k = j; Hw0S/ytY
} M~rN17S
} =`MxgK +
s3(mkdXv
} U0ZT9/4
*5|;eN
} oI\Lepl*
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SortUtil： /M,C%.-
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package org.rut.util.algorithm; ;;4>vF#*
'99rXw
import org.rut.util.algorithm.support.BubbleSort; Zz,j,w0 Z
import org.rut.util.algorithm.support.HeapSort; CF,-l B
import org.rut.util.algorithm.support.ImprovedMergeSort; #mIgk'kW<
import org.rut.util.algorithm.support.ImprovedQuickSort; #EG W76 f
import org.rut.util.algorithm.support.InsertSort; O{vVW9Q
import org.rut.util.algorithm.support.MergeSort; ~U;M1>
import org.rut.util.algorithm.support.QuickSort; YkN0,6
import org.rut.util.algorithm.support.SelectionSort; ^Z |WD!>`
import org.rut.util.algorithm.support.ShellSort; `49:!M$i
}WowgY
/** Ci-CY/]s
* @author treeroot A#o ~nC<
* @since 2006-2-2 zIzL7oD
* @version 1.0 Y)O88C
*/ VQ R E]
public class SortUtil { YW14X
public final static int INSERT = 1; x?"+Or.h
public final static int BUBBLE = 2; dguN<yS-E
public final static int SELECTION = 3; Ad}Nc"O
public final static int SHELL = 4; AjYvYMA&
public final static int QUICK = 5; )%+7"7.
public final static int IMPROVED_QUICK = 6; /f*QxNZ,p
public final static int MERGE = 7; ;i'mma_!
public final static int IMPROVED_MERGE = 8; vE~>9
public final static int HEAP = 9; #+"1">l
qWdob>u
public static void sort(int[] data) { r!N> FE
sort(data, IMPROVED_QUICK); [g/ &%n0^
} 1zcaI^e#
private static String[] name={ $etw'c0
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" +s j2C
}; .),Fdrg
1!S*z^LGl
private static Sort[] impl=new Sort[]{ ;f!}vo<;
new InsertSort(), (y^svXU}a
new BubbleSort(), JBI>D1`"
new SelectionSort(), ^XgBkC~
new ShellSort(), gcA,u)z}R
new QuickSort(), "d; T1
new ImprovedQuickSort(), 9Ai3p
new MergeSort(), CcJ%;.V,T
new ImprovedMergeSort(), r`\6+Ntb.
new HeapSort() #?h-<KQQ
}; S'_2o?fs
TpGnSD
public static String toString(int algorithm){ CJYpgSr
return name[algorithm-1]; WHy r;m3)
} 3j6Am{9
?mp}_x#=
public static void sort(int[] data, int algorithm) { :|HCUZ*H(T
impl[algorithm-1].sort(data); )p`zN=t
} <~bvfA=
;%Zu[G`C
public static interface Sort { Z#t}yC%^d
public void sort(int[] data); ,$+ P
} @hF$qevX
6n?0MMtR
public static void swap(int[] data, int i, int j) { =c;.cW
int temp = data; 8x`EUJ
data = data[j]; Ods~tM
data[j] = temp; c }7gHud
} YXLZ2-%ohZ
} u.@B-Pf[Eo