[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; _)3|f<E_t)
} 823Y\x~>
int i1=l; Q4#m\KK;i9
int i2=mid+1; _{YWXRC#
for(int cur=l;cur<=r;cur++){ /K@XzwM
if(i1==mid+1) ;PF<y9M
data[cur]=temp[i2++]; K7_UP&`=J
else if(i2>r) 5y.WMNNv{
data[cur]=temp[i1++]; MzdV2.
else if(temp[i1] data[cur]=temp[i1++]; & p
else /|6N*>l)y
data[cur]=temp[i2++]; /$Nsd
} V1N3iI
} }c,}V
24 'J
} [.7d<oY
xX&+WR
改进后的归并排序: %HhnSi1K
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package org.rut.util.algorithm.support; \h/H#jZJ
]vUwG--*
import org.rut.util.algorithm.SortUtil; y@S$^jk.
3)<yod=
/** A4x]Qh3OO
* @author treeroot *SJ_z(CZm
* @since 2006-2-2 {#vgtgBB
* @version 1.0 y&$A+peJ1
*/ gV's=cQ
public class ImprovedMergeSort implements SortUtil.Sort { KxJ!,F{>H
~d.Y&b
private static final int THRESHOLD = 10; DN>[\hg
{BN#h[#B{
/* G5BfNU
* (non-Javadoc) S6DKREO
* Ko<:Z)PS
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) U)o-8OEZ9
*/ 2~)`N>@
public void sort(int[] data) { `KoV_2|
int[] temp=new int[data.length]; ~^:A{/
mergeSort(data,temp,0,data.length-1); T4Uev*A
} I{C SH
w,.TTTad
private void mergeSort(int[] data, int[] temp, int l, int r) { e8a+2.!&\
int i, j, k; V+Y%v.F
int mid = (l + r) / 2; sUO`uqZV
if (l == r) Di6?[(8
return; S&wMrQ
if ((mid - l) >= THRESHOLD) WaRw05r
mergeSort(data, temp, l, mid); 03X1d-
else Jq-]7N%k/
insertSort(data, l, mid - l + 1); X'Xx"M
if ((r - mid) > THRESHOLD) (=AWOU+
mergeSort(data, temp, mid + 1, r); W:2( .?
else kiaw4_
insertSort(data, mid + 1, r - mid); Ty?cC**
z2~til
for (i = l; i <= mid; i++) { /{g>nzP
temp = data; kS);xA8s]
} .W%)*&WH\
for (j = 1; j <= r - mid; j++) { b{&)6M)zo
temp[r - j + 1] = data[j + mid]; Dcgo%F-W
} d7;um<%zn
int a = temp[l]; Se}c[|8
int b = temp[r]; zY{A'<\O
for (i = l, j = r, k = l; k <= r; k++) { jvL[ JI,b
if (a < b) { Ynj,pl
data[k] = temp[i++]; =&]g "a'
a = temp; rglXs
} else { gPI ?C76
data[k] = temp[j--]; K($Npuu]
b = temp[j]; (y~TL*B
} mO7]9p
} 1.GQau~
} )Nw8O{\
YK'<NE3 4
/** Z@S3ZGe
* @param data .|70;
* @param l U%QI a TN*
* @param i zwjgE6
*/ [}=B8#Jl-C
private void insertSort(int[] data, int start, int len) { e X|m
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); AQvudx)@"
} 6A-|[(NS
} /W<;Z;zk
} jV1.Yz(`
} hMO=#up&
wlqksG[B
堆排序： \Gvm9M
cdT7 @
package org.rut.util.algorithm.support; .Yn_*L+4*
eq;uO6[
import org.rut.util.algorithm.SortUtil; }&J q}j
{4Cmu;u
/** FvjPdN/L?R
* @author treeroot dR,fXQm
* @since 2006-2-2 29.h91
* @version 1.0 (hbyEQhF
*/ O_7|C\]
public class HeapSort implements SortUtil.Sort{ VY4yS*y
_]H&,</
/* (non-Javadoc) yvB.&<]No
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Z@!+v19^
*/ e*NnVys
public void sort(int[] data) { /nA{#HY
MaxHeap h=new MaxHeap(); YNF k
h.init(data); <PH#[dH
for(int i=0;i h.remove(); 5U$0F$BBp
System.arraycopy(h.queue,1,data,0,data.length); ]N?kG`[
} ^u ~Q/4
0aB;p7~&
private static class MaxHeap{ igPX#$0XU
W^l-Y%a/o
void init(int[] data){ oap4rHk}
this.queue=new int[data.length+1]; `d}2O%P
for(int i=0;i queue[++size]=data; S.NPZ39}ZE
fixUp(size); /*mI<[xb
} /h3RmUy
} h S&R(m
+cN8Y}V
private int size=0; X l5 A 'h
1mG-}
private int[] queue; kt:! 7
vl:KF7:#m
public int get() { @\#td5'
return queue[1]; tGa8W
} r;N|)
u'BaKWPS
public void remove() { (*iHf"=\
SortUtil.swap(queue,1,size--); 1=V-V<
fixDown(1); 3a'<*v<xw
} MQ6KN(?\ZL
file://fixdown MQ8J<A Pf-
private void fixDown(int k) { wnC81$1l~
int j; $xN|5;+
while ((j = k << 1) <= size) { fNFY$:4X
if (j < size %26amp;%26amp; queue[j] j++; }pkzH'$HJ
if (queue[k]>queue[j]) file://不用交换 C~/a-
break; J)-x!y>
SortUtil.swap(queue,j,k); Sdryol<
k = j; KbeC"mi
} %EB/b
} Ysv" 6b}
private void fixUp(int k) { ew4U)2J+
while (k > 1) { N~'c_l
int j = k >> 1; >z@0.pN]7
if (queue[j]>queue[k]) Y}wyw8g/
break; sQZhXaMa $
SortUtil.swap(queue,j,k); Cw&KVw*
k = j; H qx-;F~0
} xJ.M;SF4
} utV_W&
IH+|}z4N?>
} UkFC~17P
x[e<} 8'$(
} nqUV
Zj'9rXhrM1
SortUtil： Z *x'+X
'm$L Ij?@
package org.rut.util.algorithm; DN6Mo<H
#%O0[kd
import org.rut.util.algorithm.support.BubbleSort; l.M0`Cn-%
import org.rut.util.algorithm.support.HeapSort; U 6)#}
import org.rut.util.algorithm.support.ImprovedMergeSort; f3y=Wxk[
import org.rut.util.algorithm.support.ImprovedQuickSort; sRb9`u=)
import org.rut.util.algorithm.support.InsertSort; }Zp,+U*"
import org.rut.util.algorithm.support.MergeSort; |2A:eI8 ^
import org.rut.util.algorithm.support.QuickSort; dk^~;m#iN
import org.rut.util.algorithm.support.SelectionSort; KMax$
import org.rut.util.algorithm.support.ShellSort; fp"W[S|uL
4#Jg9o
/** S,8elKH4
* @author treeroot p5*EA x
* @since 2006-2-2 =Dj#gV
* @version 1.0 ^S; -fYW2
*/ 2GG2jky{/
public class SortUtil { TWX.D`W
public final static int INSERT = 1; =?8@#]G+
public final static int BUBBLE = 2; 2&cT~ZX&'
public final static int SELECTION = 3; m9;SrCN_
public final static int SHELL = 4; #GFr`o0$^
public final static int QUICK = 5; @2i9n
public final static int IMPROVED_QUICK = 6; <:CkgR$/{
public final static int MERGE = 7; ))Za&S*<
public final static int IMPROVED_MERGE = 8; r<$y=B
public final static int HEAP = 9; RxQ*
E"IZ6)Q
public static void sort(int[] data) { 1|:KQl2q
sort(data, IMPROVED_QUICK); ;hq\
} Q/Rqa5LI:
private static String[] name={ {n=|Db~S
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" :k#HW6p
}; #<xm.
^<6[.)
private static Sort[] impl=new Sort[]{ gRzxLf`K
new InsertSort(), VIbq:U
new BubbleSort(), E{vbO/|kf
new SelectionSort(), 3OB"#Ap8<
new ShellSort(), &7s.`
new QuickSort(), 4skD(au8
new ImprovedQuickSort(), yf,z$CR
new MergeSort(), ^B^9KEjTz
new ImprovedMergeSort(), }6ldjCT/,
new HeapSort() % ]U
}; vP,n(reM
7xR\kL.,
public static String toString(int algorithm){ _#8MkW#]~
return name[algorithm-1]; "J1 4C9u
} ^ZCD ~P_=
\b>]8Un"
public static void sort(int[] data, int algorithm) { ~VB1OLgv#.
impl[algorithm-1].sort(data); Dt1jW
} 4I[P>
$:^td/p J
public static interface Sort { ,#K'PB4E
public void sort(int[] data); [D1Up
} 19] E 5'AI
ee=D1qNu;
public static void swap(int[] data, int i, int j) { +w~oH=
int temp = data; @(lh%@hO
data = data[j]; l+b~KU7~l
data[j] = temp; |vC~HJpuv'
} E" vS $
} 2KZneS`