[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; jN7Z}1`
} R ta_\Aj!
int i1=l; 9'p pb
int i2=mid+1; IifH=%2Y
for(int cur=l;cur<=r;cur++){ Qm?o^%a
if(i1==mid+1) } /Iw]!lK2
data[cur]=temp[i2++]; &gm/@_
else if(i2>r) o`ODz[04
data[cur]=temp[i1++]; bqR0./V
else if(temp[i1] data[cur]=temp[i1++]; y=}a55:qE
else ue}lAW{q
data[cur]=temp[i2++]; jin?;v
} r3Ih]|FK#
} D4GXZX8K
D2#.qoP #
} :4238J8
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改进后的归并排序: ou&7v<)x4
nZS*"O#L
package org.rut.util.algorithm.support; gi\UNT9x
K9'AYFse
import org.rut.util.algorithm.SortUtil; hN:2(x
FkoN+\d
/** v|>'m#Ln2
* @author treeroot jZ69sDhE
* @since 2006-2-2 qjvIp-
* @version 1.0 B;L^!sLP
*/ 2) A$bx
public class ImprovedMergeSort implements SortUtil.Sort { H*dQTy,
/#?i+z
private static final int THRESHOLD = 10; \V<deMb=
NslaG
/* \3z^/F~
* (non-Javadoc) Hn(L0#Oqy
* }*0*8~Q'5
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Yr+ghl/ V
*/ "[]72PC
public void sort(int[] data) { af7\2g3*
int[] temp=new int[data.length]; ~E7=c3:"
mergeSort(data,temp,0,data.length-1); >E(IkpZ
} *W<g%j-a
D'Sdz\:4
private void mergeSort(int[] data, int[] temp, int l, int r) { .gHL(*1P
int i, j, k; ;0\
int mid = (l + r) / 2; j2{ '!
if (l == r) v~HfA)#JK
return; -U_<:
if ((mid - l) >= THRESHOLD) YJrZ
mergeSort(data, temp, l, mid); X?.LA7)CK
else FY]z*=
insertSort(data, l, mid - l + 1); 30/(
if ((r - mid) > THRESHOLD) %"RgW\s[R
mergeSort(data, temp, mid + 1, r); ma26|N5
else ag$UNV
insertSort(data, mid + 1, r - mid); lV!@h}mG
+2]{%=
for (i = l; i <= mid; i++) { w-MnJ(r
temp = data; %!1:BQ,p,i
} +EgQj*F*
for (j = 1; j <= r - mid; j++) { !~k-Sexh
temp[r - j + 1] = data[j + mid]; niN$!k+Jr
} )Ikx0vDFQ
int a = temp[l]; ^?tF'l`
int b = temp[r]; >?A3;O]
for (i = l, j = r, k = l; k <= r; k++) { Lv ,Ls
if (a < b) { (@?PN+68|
data[k] = temp[i++]; N;\by<snN
a = temp; @7';bfsix
} else { fM)RO7
data[k] = temp[j--]; u_U51C\rb
b = temp[j]; j^Z3
} $ p{Q]|ww
} /CN^">|_
} cB7=4:U
yf7p0;$?
/** N8l(m5Kk,k
* @param data ';!02=-@
* @param l 5lC"10
* @param i GVp2|\-L
*/ t=ry\h{Pc
private void insertSort(int[] data, int start, int len) { < F Cr L
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); O<h`[1eUjS
} ;dYpdy
} p68) 0
} n2H2G_-L[
} %8+'L4
+x0-hRD
堆排序： ]E)gMf
2FS,B\d
package org.rut.util.algorithm.support; a8%/Xwr~
N*My2t_+E
import org.rut.util.algorithm.SortUtil; ~z!U/QR2
NLC}XL
/** E$rn^keM
* @author treeroot >g6:{-b^a
* @since 2006-2-2 @4b"0ne}h
* @version 1.0 .yF7{/
*/ #.%;U' #O
public class HeapSort implements SortUtil.Sort{ i5*sG^<$H
@hWt.qO3s
/* (non-Javadoc) {j E}mzi
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) B;':Eaa@
*/ R '/Ilz`
public void sort(int[] data) { E7axINca
MaxHeap h=new MaxHeap(); ]baO{pJi
h.init(data); W%.Kr-[?`o
for(int i=0;i h.remove(); ^r$P&}Z\b
System.arraycopy(h.queue,1,data,0,data.length); mi3yiR
} ;^FV
pUr.<yc&u
private static class MaxHeap{ TP oP%Yj"
70m}+R(`
void init(int[] data){ F,`y_71<
this.queue=new int[data.length+1]; qgU$0enSs
for(int i=0;i queue[++size]=data; BaTE59W
fixUp(size); 3%xj-7z W
} SVaC)O(
} z&d&Ky
V4Ql6vg_f
private int size=0; H5=-b@(
q=E<y
private int[] queue; jO$3>q
Xi1/wbC
public int get() { WrL&$dEJ?M
return queue[1]; U)+Yh
} }}l04kN_
fXBA P10#
public void remove() { O6;7'
SortUtil.swap(queue,1,size--); 7WW@%4(
fixDown(1); ~FM5]<X)
} 4S@^ym
file://fixdown X%S?o
private void fixDown(int k) { pNI=HHx
int j; pVPCxP
while ((j = k << 1) <= size) { a!P?RbW
if (j < size %26amp;%26amp; queue[j] j++; N/mTG2'<
if (queue[k]>queue[j]) file://不用交换 Cjsy1gA
break; 50Co/-)j
SortUtil.swap(queue,j,k); $ T.c>13
k = j; V\WqA8
} 6<R!`N 6
} ]7-*1kL8=~
private void fixUp(int k) { ^6|Q$]}Ok
while (k > 1) { =ex71qj)
int j = k >> 1; NS;,(v{*N
if (queue[j]>queue[k]) Ylll4w62N
break; BYrj#n5
SortUtil.swap(queue,j,k); y}5H<ZcXA
k = j; < ppg$;
} >c?Z.of
} +EJIYvkFm
y'pAhdF
} kl_JJX6jPP
DnP>ed"M!
} a&p|>,WS
j}'spKxu
SortUtil： 5EIh5Y EU>
^c!"*L0E
package org.rut.util.algorithm; (5re'Pl
pog*}@OS
import org.rut.util.algorithm.support.BubbleSort; KE`}P<K&
import org.rut.util.algorithm.support.HeapSort; KZ pqbI Z
import org.rut.util.algorithm.support.ImprovedMergeSort; Uoh!1_oV
import org.rut.util.algorithm.support.ImprovedQuickSort; kb]PWOz
import org.rut.util.algorithm.support.InsertSort; Y'`w.+9
import org.rut.util.algorithm.support.MergeSort; CYmwT>P+*4
import org.rut.util.algorithm.support.QuickSort; B_anO{3$4
import org.rut.util.algorithm.support.SelectionSort; &%}6&PWi
import org.rut.util.algorithm.support.ShellSort; iZB?5|*
S v$%-x^t
/** *f=H#
* @author treeroot znzh$9tH
* @since 2006-2-2 @S yGj#
* @version 1.0 OW\r }
*/ gh|TlvnA
public class SortUtil { 3G dWq*
public final static int INSERT = 1; WrQe'ny
public final static int BUBBLE = 2; fa;\4#
public final static int SELECTION = 3; t{| KL<d]
public final static int SHELL = 4; u1xCn\
public final static int QUICK = 5; nc!P !M
public final static int IMPROVED_QUICK = 6; /mX/ "~
public final static int MERGE = 7; _$]3&P
public final static int IMPROVED_MERGE = 8; +6-c<m|
public final static int HEAP = 9; Fx*iAH\e
H[UV]qO,
public static void sort(int[] data) { -uXf?sTV
sort(data, IMPROVED_QUICK); D.9qxM"Z>
} W~z 2Q so
private static String[] name={ +hI:5(_
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" Va"Q1 *"
}; 9aFu51
+] >o@
private static Sort[] impl=new Sort[]{ 8e:J{EG~
new InsertSort(), `h}fS4CO
new BubbleSort(), 9q5jqFQ
new SelectionSort(), _SC{nZ[
new ShellSort(), )HQ':ZE$
new QuickSort(), -'r4@='6}
new ImprovedQuickSort(), :3J,t//c
new MergeSort(), ZgK[,<2
new ImprovedMergeSort(), xr}3vJ7
new HeapSort() ?zGx]?1P1<
}; dE~]%fUFy-
mZQW>A]iE
public static String toString(int algorithm){ ,c<&)6FU]
return name[algorithm-1]; #$2{l,>
} >7i&(6L
$(/=Wn
public static void sort(int[] data, int algorithm) { _GS_R%b
impl[algorithm-1].sort(data); +e}v)N
} 7yM=$"'d
~(OG3`W!
public static interface Sort { {Z0(V"Q
public void sort(int[] data); #d2XVpO[0
} Is1P,`*!
^)oBa=jL4
public static void swap(int[] data, int i, int j) { viB'ul7o
int temp = data; A?i ~*#wE
data = data[j]; Wu3or"lcw*
data[j] = temp; *:S_v.Y3"
} $p:RnH\H1
} vy&'A$ H