[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; "HqmS
} P* &0HbJ
int i1=l; }vY^eOK.
int i2=mid+1; ,\&r\!=
for(int cur=l;cur<=r;cur++){ z3L=K9)
if(i1==mid+1) S~fP$L5
data[cur]=temp[i2++]; !Z\Gv1
else if(i2>r) 3`{ vx
data[cur]=temp[i1++]; J| wk})?
else if(temp[i1] data[cur]=temp[i1++]; FF^h(Ea
else y*sVimx
data[cur]=temp[i2++]; DOFW"SpE
} i={4rZOD^
} 9a]o?>`E
,aS+RJNM
} 1c]{rO=taN
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改进后的归并排序: DQ/rx`BG
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package org.rut.util.algorithm.support; 8Ara^Xh}q
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import org.rut.util.algorithm.SortUtil; .L%pWRxA[
,38M6yD
/** 3$P
* @author treeroot acUyz2x
* @since 2006-2-2 "m6G;cv
* @version 1.0 +IbV
*/ 4B[pQlg
public class ImprovedMergeSort implements SortUtil.Sort { +eH`mI0f
UeZ(@6_:
private static final int THRESHOLD = 10; }dMX1e1h8
Ho*B<#&(A|
/* -Q<OSa='
* (non-Javadoc) -!5l4
* HRbv%
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) <<gW`KF
*/ [hot,\+f
public void sort(int[] data) { V"K.s2U^
int[] temp=new int[data.length]; `DSFaBj,
mergeSort(data,temp,0,data.length-1); |unvDXx-
} ,/V~T<FI
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private void mergeSort(int[] data, int[] temp, int l, int r) { 8;<aco/62
int i, j, k; 4:O.x#p
int mid = (l + r) / 2; 1GkoE
if (l == r) 'CJ_&HR
return; Uy|!f]"?
if ((mid - l) >= THRESHOLD) $'d,X@}8
mergeSort(data, temp, l, mid); yk4py0xVl
else ac@\\2srV
insertSort(data, l, mid - l + 1); Hl(W'>*oL
if ((r - mid) > THRESHOLD) *w^!\
mergeSort(data, temp, mid + 1, r); Tyaqa0
else @m%B>X28F
insertSort(data, mid + 1, r - mid); !UPB4I
WnOYU9;%
for (i = l; i <= mid; i++) { wi.E$RckD
temp = data; jjEu
} VFnxj52<
for (j = 1; j <= r - mid; j++) { Oi~Dio_?
temp[r - j + 1] = data[j + mid]; G[>CBh5
} (yuOY/~k/
int a = temp[l]; P<[) qq@;
int b = temp[r]; @~7au9.V=X
for (i = l, j = r, k = l; k <= r; k++) { =2rdbq6R
if (a < b) { @Ss W
data[k] = temp[i++]; v;?W|kJ.u
a = temp; uhaHY`w
} else { pON#r
data[k] = temp[j--]; -%>Tjo@Bn
b = temp[j]; qSD`S1'2;
} ? ][/hL@[
} 8 ks\-38n1
} n[i:$! ,
[GK##z'5
/** ,d.5K*?aI
* @param data `{yI| Wf
* @param l {`)oxzR
* @param i m8b-\^eP7
*/ &jg>X+;
private void insertSort(int[] data, int start, int len) { n++ak\
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); Unt]=S3u
} fo>_*6i74
} @J^ Oy 3z
} &IDT[J
} 9Ou}8a?m"
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堆排序： {H9g&pfv
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package org.rut.util.algorithm.support; 5BLBcw\;
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import org.rut.util.algorithm.SortUtil; f`-vnh^+
e iH&<AH
/** '< >Q20
* @author treeroot I'n}6D.M
* @since 2006-2-2 U_Mag(^-
* @version 1.0 -<T>paE9
*/ +Qzl-eN/+
public class HeapSort implements SortUtil.Sort{ } 21!b :a
cL#zE
/* (non-Javadoc) bng/v
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) /=#~8
*/ &FZ~n?;hQ
public void sort(int[] data) { ) R5[aO
MaxHeap h=new MaxHeap(); &K=)YpT
h.init(data); |VyN>&r~6
for(int i=0;i h.remove(); B'vIL'
System.arraycopy(h.queue,1,data,0,data.length); 1Zo3K<*J
} 5OFB[
D^];6\=.i
private static class MaxHeap{ D6yE/QeK4
:y{@=E=XSC
void init(int[] data){ CL(D&8v8~
this.queue=new int[data.length+1]; ||7x51-yj
for(int i=0;i queue[++size]=data; mL;oR4{
fixUp(size); ,]9p&xu
} 4/S3hH
} 7g oRj
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private int size=0; .K#' Fec
2Mw`
private int[] queue; fp3`O9+em
JV!F<
public int get() { EQHCw<e
return queue[1]; G-vkkNj%e
} +^rt48${ y
G/(tgQ
public void remove() { wIF'|"
SortUtil.swap(queue,1,size--); n7n-uc
fixDown(1); Wn2J]BH
} jEP'jib%
file://fixdown =6fJUy^M\
private void fixDown(int k) { H:z<]Rc
int j; UhU+vy6)/
while ((j = k << 1) <= size) { -"2%+S{
if (j < size %26amp;%26amp; queue[j] j++; a`C2:Z23(#
if (queue[k]>queue[j]) file://不用交换 c,G[Rk
break; VIod6Vk
SortUtil.swap(queue,j,k); K[9P{0hA
k = j; {p(6bsn_#]
} NVf_#p"h
} c47.,oTo
private void fixUp(int k) { CX5>/
while (k > 1) { A*]sN8
int j = k >> 1; BGu<1$G
if (queue[j]>queue[k]) J~ z00p`E
break; wo86C[
SortUtil.swap(queue,j,k); W<~u0AyO 3
k = j; bK!uR&i^l
} 2,h]Y=.s
} u+pZ<Bb
kidv^`.H$w
} b0N7[M1Xl
99~-TiU
} bl|)/)6o
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SortUtil： IG:CWPU
qUQP.4Z95
package org.rut.util.algorithm; '|&?$g(\h
r|953e
import org.rut.util.algorithm.support.BubbleSort; SmAF+d
import org.rut.util.algorithm.support.HeapSort; 2aUE<@RU[
import org.rut.util.algorithm.support.ImprovedMergeSort; dA(+02U/.
import org.rut.util.algorithm.support.ImprovedQuickSort; ,LU|WXRB
import org.rut.util.algorithm.support.InsertSort; k/Ao?R=@gI
import org.rut.util.algorithm.support.MergeSort; Y5mk*Q#q
import org.rut.util.algorithm.support.QuickSort; WBD"d<>'
import org.rut.util.algorithm.support.SelectionSort; >IZ$ .-
import org.rut.util.algorithm.support.ShellSort; `n`HwDo;i
,!^;<UR:
/** -e+im(2D=
* @author treeroot {]7lh#M
* @since 2006-2-2 7;sF0oB5e
* @version 1.0 ^|cax|>
*/ EM'#'fBZ>Y
public class SortUtil { ;T>.
public final static int INSERT = 1; `2G%&R,k"D
public final static int BUBBLE = 2; kNrd=s,-]D
public final static int SELECTION = 3; ng[LSB*57Y
public final static int SHELL = 4; |1+mHp
public final static int QUICK = 5; &w^:nVgl
public final static int IMPROVED_QUICK = 6; #<-%%
public final static int MERGE = 7; *Oh]I|?
public final static int IMPROVED_MERGE = 8; ;,@Fz
public final static int HEAP = 9; YJZ`Clp?
_J_QB]t
public static void sort(int[] data) { L^ U.h
sort(data, IMPROVED_QUICK); W)odaab7
} u&o<>d;)
private static String[] name={ bI)%g
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" lygv#s-T
}; q9$K.=_5
(^)(#CxO
private static Sort[] impl=new Sort[]{ };>~P%u32
new InsertSort(), 'W p~8}i@
new BubbleSort(), mbIHzzW>
new SelectionSort(), (+bt{Ma
new ShellSort(), %^;rYn3
new QuickSort(), *adwCiB
new ImprovedQuickSort(), 9%?a\#C
new MergeSort(), ,Q+.kAh !G
new ImprovedMergeSort(), s`dUie}y<
new HeapSort() l+^4y_
}; Okd7ua-f
*UdP1?Y
public static String toString(int algorithm){ p2wDk^$
return name[algorithm-1]; )JR&
} =$< .:b
}I~)o!N%7
public static void sort(int[] data, int algorithm) { Cuom_+wV&
impl[algorithm-1].sort(data); $69d9g8-(!
} $< .wQ8:Q
D+4$l+\u
public static interface Sort { G,@Jo[e
public void sort(int[] data); /+?eSgM/
} kclZ+E
Y\9zjewc
public static void swap(int[] data, int i, int j) { ?Pt*4NaT;
int temp = data; (ZD~Q_O-
data = data[j]; %/%TR@/
data[j] = temp; `_pVwa<@w
} ]/?$DNjCc
} 2-@z-XKn