[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; b v5BV
} @|N{EI
int i1=l; 2Kwr=t
int i2=mid+1; @` 5P^H7
for(int cur=l;cur<=r;cur++){ 3:qn\"Hj
if(i1==mid+1) pV[SY6/
data[cur]=temp[i2++]; _D.4=2@|l8
else if(i2>r) dT?mMTKn+
data[cur]=temp[i1++]; "!,)Pv
else if(temp[i1] data[cur]=temp[i1++]; Tg/?v3M88
else r"YOA@
data[cur]=temp[i2++]; M5c$
} xe`SnJgA
} >W>3w
o4P>t2'
} E/OfkL*\
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改进后的归并排序: ?vh1 >1D
%^pm~ck!
package org.rut.util.algorithm.support; |pgrR7G'
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import org.rut.util.algorithm.SortUtil; l\tg.O~
yVfF *nG
/** b@X+vW{S
* @author treeroot ?hBjq
* @since 2006-2-2 T$!Pkdh
* @version 1.0 9q[d?1
*/ 5LaF'>1yY
public class ImprovedMergeSort implements SortUtil.Sort { OJ?U."Lxm$
N.'-9hv
private static final int THRESHOLD = 10; T\v~"pMu*0
C:r3z50
/* zt!)7HBo
* (non-Javadoc) =W[M=_0u
* ~`yO@f;D
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 5D+rR<pD}"
*/ FeL!%z
public void sort(int[] data) { b]5/IT)@O
int[] temp=new int[data.length]; adY ,Nz
mergeSort(data,temp,0,data.length-1); %_(Xn
} bUU\bc
C[R|@9NI
private void mergeSort(int[] data, int[] temp, int l, int r) { *)bh6b=7
int i, j, k; VW\xuP
int mid = (l + r) / 2; 6qR5A+|;
if (l == r) I+eKuWB
return; pN=>q<]L
if ((mid - l) >= THRESHOLD) bt=z6*C>A
mergeSort(data, temp, l, mid); yRy^'E~
else Uc<BLu;
insertSort(data, l, mid - l + 1); \ v2-}jU(
if ((r - mid) > THRESHOLD) @Ta0v:Y
mergeSort(data, temp, mid + 1, r); x~?|bnM#3
else 0d/ f4
insertSort(data, mid + 1, r - mid); p}]K0F!
0u}+n+\g
for (i = l; i <= mid; i++) { %6Y\4Fe
temp = data; M#}k@ ;L3
} "N3!!3
for (j = 1; j <= r - mid; j++) { X?7s
temp[r - j + 1] = data[j + mid]; Yij_'0vZ
} 3w&Z:<
int a = temp[l]; 6GMwB@ b
int b = temp[r]; s:xt4<
for (i = l, j = r, k = l; k <= r; k++) { nTv^][
if (a < b) { woUt*G@
data[k] = temp[i++]; NqC}}N\,
a = temp; 8}aSSL]
} else { `3^%ft~l
data[k] = temp[j--]; 3[UaK`/1C
b = temp[j]; 7*eIs2aY
} _ |G') 9
} LS/ZZAN u
} 8a;;MJ)
AzMX~cd
/** .A F94OlE/
* @param data +WE<S)z<
* @param l th|'t}bWV
* @param i &[t} /+)
*/ )1/J5DI @8
private void insertSort(int[] data, int start, int len) { _};T:GOT
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); F;ELsg
} Dco3`4pl
} i4<n#]1!t
} !-Uq#Ea0/
} H2{&da@D5
_b! TmS#F1
堆排序： LIRL`xU7
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package org.rut.util.algorithm.support; YeI|&FMX
o4H'
import org.rut.util.algorithm.SortUtil; ._p^0UxT
9gFfbvd
/** 5Z_aN|Xn
* @author treeroot _N"c,P0
* @since 2006-2-2 Q"k #eEA
* @version 1.0 _|>bOI
*/ i\zN1T_
public class HeapSort implements SortUtil.Sort{ MZt&HbD-
Na.)!h_Kn'
/* (non-Javadoc) :0% $u>;O:
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) vv1W<X0e<
*/ @4wN-T+1
public void sort(int[] data) { $aY:Z_s
MaxHeap h=new MaxHeap(); DfZ)gqp/Av
h.init(data); \|7Y"WEQ
for(int i=0;i h.remove(); 3uuB/8
System.arraycopy(h.queue,1,data,0,data.length); 6'|NALW
} K7},X01^
ub-vtRpm
private static class MaxHeap{ *#Iqz9X.Y3
ug?#Oa
void init(int[] data){ :?$<:
this.queue=new int[data.length+1]; "|GX%>/
for(int i=0;i queue[++size]=data; m88[(l
fixUp(size); pAH9
} @rlL'|&X*
} \GCT3$
i%otvDn1
private int size=0; J%P{/nR
X?SLYm@v
private int[] queue; J5zu}U?
"v+%F
public int get() { O7xBMqMf
return queue[1]; xL|4'8
} GE#LcCa
J1d|L|M
public void remove() { GD<pqm`vVY
SortUtil.swap(queue,1,size--); *h~(LH"tN
fixDown(1); VMW<?V 2Z
} g?9%_&/})A
file://fixdown JT*Pm"}
private void fixDown(int k) { ~!ICBF~j
int j; vb2aj!8_?
while ((j = k << 1) <= size) { Y#fiJ
if (j < size %26amp;%26amp; queue[j] j++; wi S8S{K5
if (queue[k]>queue[j]) file://不用交换 [KsVI.gn
break; J:2Su1"ODh
SortUtil.swap(queue,j,k); nEh^{6
k = j; baib_-$
} pjNH0mZ
} o[>p
private void fixUp(int k) { y0 qq7Dmu
while (k > 1) { (^= Hq'D
int j = k >> 1; l]mn4cn3
if (queue[j]>queue[k]) aR0v qRF
break; )}SiM{g
SortUtil.swap(queue,j,k); &;@U54,wV
k = j; \\,z[C
} n4G53+y'
} jIL$hqo
LJBDB6
} q^+Z>
@-BgPDi.Z
} J!*Pg<
Zq>}SR
SortUtil： BXX1G
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package org.rut.util.algorithm; o/p'eY:)
Lz;E/a}s
import org.rut.util.algorithm.support.BubbleSort; g<PdiVp+
import org.rut.util.algorithm.support.HeapSort; Z.mnD+{
import org.rut.util.algorithm.support.ImprovedMergeSort; *,oZ]!
import org.rut.util.algorithm.support.ImprovedQuickSort; :]-? l4(%
import org.rut.util.algorithm.support.InsertSort; AV?<D.<
import org.rut.util.algorithm.support.MergeSort; }S>:!9f
import org.rut.util.algorithm.support.QuickSort; z,/y2H2
import org.rut.util.algorithm.support.SelectionSort; M^~
import org.rut.util.algorithm.support.ShellSort; l%9nA.M'
My\
/** V39)[FH}
* @author treeroot ^1NtvQe@Y\
* @since 2006-2-2 |cq%eN
* @version 1.0 AZadNuL/
*/ T#w *5Qf
public class SortUtil { d^jIsE`
public final static int INSERT = 1; cRC)99HP
public final static int BUBBLE = 2; N>_d {=P
public final static int SELECTION = 3; >zWVM1\\j
public final static int SHELL = 4; 9TILrK
public final static int QUICK = 5; "ktC1y1
public final static int IMPROVED_QUICK = 6; b{Kw.?85
public final static int MERGE = 7; 0!,)7
public final static int IMPROVED_MERGE = 8; .j0]hn]
public final static int HEAP = 9; R7!^ M
;t}ux
public static void sort(int[] data) { "rIBy
sort(data, IMPROVED_QUICK); o'nrLI(t
} hy|X(m
private static String[] name={ 7&9'=G
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" wq"AWyu
}; D^H<)5d9
1MzOHE
private static Sort[] impl=new Sort[]{ me`(J y<
new InsertSort(), $[P>nRhW
new BubbleSort(), JTg0T+
new SelectionSort(), mLn =SU{#
new ShellSort(), q7%eLJ
new QuickSort(), 5CuK\<
new ImprovedQuickSort(), uH-*`*
new MergeSort(), T4{&@b 0*
new ImprovedMergeSort(), 6">jf #pE
new HeapSort() 'zhw]L;'g
}; 0yxMIX
84*Fal~Som
public static String toString(int algorithm){ tr\Vr;zd
return name[algorithm-1]; !j.jvI%e;
} D?_#6i;DJ
g$*VA} s
public static void sort(int[] data, int algorithm) { zorTZ #5
impl[algorithm-1].sort(data); /< CjBW:
} q>q@ztt
xbA% 'p
public static interface Sort { o s HE4x
public void sort(int[] data); /Iu._2
} =}~hbPJM
\HOOWaapN
public static void swap(int[] data, int i, int j) { U;:,$]+
int temp = data; s/K}]F
data = data[j]; -ijQTB
data[j] = temp; X+K$y:UZ
} a;`-LOO5&
} 0R2 AhA#