[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; VK m&iidU
} '=b/6@&
int i1=l; 0Tx6zO
int i2=mid+1; qLD ?juas
for(int cur=l;cur<=r;cur++){ Q'=x|K#xj
if(i1==mid+1) *\ R ]NV
data[cur]=temp[i2++]; X% t1T4
else if(i2>r) T&6l$1J
data[cur]=temp[i1++]; |fK1/<sz#
else if(temp[i1] data[cur]=temp[i1++]; Te"ioU?.
else GS$ifv
data[cur]=temp[i2++]; Tp/6,EE
} v[1aWv:
} !>FYK}c7
xi~?>f
} >qnko9V
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改进后的归并排序: d;boIP`M;
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package org.rut.util.algorithm.support; LSL/ZvSP
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import org.rut.util.algorithm.SortUtil; =$'6(aDH
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/** ldU?{o:\s
* @author treeroot 0"<H;7K#W
* @since 2006-2-2 p`olCp'
* @version 1.0 ZMQZs~;~d
*/ .*OdqLz
public class ImprovedMergeSort implements SortUtil.Sort { wr$("A(
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private static final int THRESHOLD = 10; ,wQ5.U,
J,'M4O\S
/* 'j#*6xD
* (non-Javadoc) , qMzWa
* fK>L!=Q
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 9+Np4i@
*/ Cio 1E-4
public void sort(int[] data) { R@1xt@?
int[] temp=new int[data.length]; luh$2 \5B
mergeSort(data,temp,0,data.length-1); }T(D7|^R
} UXJeAE-
}bb;~
private void mergeSort(int[] data, int[] temp, int l, int r) { {'7B6
int i, j, k; - YEZ]:"
int mid = (l + r) / 2; G/)O@Ugp
if (l == r) xQ f*
return; BtkOnbz8X
if ((mid - l) >= THRESHOLD) Ua:}Vn&!
mergeSort(data, temp, l, mid); ^UP`%egR
else &GpRI(OB/+
insertSort(data, l, mid - l + 1); P78g/p T
if ((r - mid) > THRESHOLD) 9 P l
mergeSort(data, temp, mid + 1, r); 94'&b=5+
else y6(Z`lx
insertSort(data, mid + 1, r - mid); u|\1hLXX
3#LlDC_WC
for (i = l; i <= mid; i++) { %z=le7
temp = data; E>6MeO
} zVViLUwG
for (j = 1; j <= r - mid; j++) { 5%Y3 Kwyy
temp[r - j + 1] = data[j + mid]; {&&z-^
} ?g_3 [Fk
int a = temp[l]; W: z6Koc0
int b = temp[r]; =Qy<GeY
for (i = l, j = r, k = l; k <= r; k++) { \j$&DCv
if (a < b) { G<L;4nA)
data[k] = temp[i++]; yuh *
a = temp; ik)|{%!K]H
} else { X]ipI$'+C
data[k] = temp[j--]; ?qb}?&1
b = temp[j]; 2=*H 8'k
} OAgniLv
} wW Lj?;bx
} 6fkRrD
U7?;UCmX
/** xK>*yV
* @param data ^ gdaa>L
* @param l )*u8/U
* @param i `}p0VmD{NE
*/ 7y.kQI?3
private void insertSort(int[] data, int start, int len) { iDpSj!x/_
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); z<MsKD0Q
} 9Gvd&U
} [*Z;\5&P
} =}~hWL
} +Q/R{#O
=O~_Q-
堆排序： 4S7v:1~xe
J"0`%'*/
package org.rut.util.algorithm.support; Sh/08+@+L:
Lc}y<=P@
import org.rut.util.algorithm.SortUtil; 0HZ{Y9]
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/** FnwJ+GTu
* @author treeroot i}cRi&2[
* @since 2006-2-2 ncaT?~u j
* @version 1.0 atj(eg
*/ u^&^UxCA
public class HeapSort implements SortUtil.Sort{ y5vvu>nd
R|'ybW'Y
/* (non-Javadoc) AzPu)
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) QFA8N
*/ rjK%t|aV^
public void sort(int[] data) { hqD*z6aH
MaxHeap h=new MaxHeap(); @JGP,445
h.init(data); 49eD1h3'X[
for(int i=0;i h.remove(); |44Ploz2b
System.arraycopy(h.queue,1,data,0,data.length); M$wC=b
} W<'m:dq
91/Q9xY
private static class MaxHeap{ \UA[
(|2t#'m
void init(int[] data){ Kf3"Wf^q
this.queue=new int[data.length+1]; n3WlZ!$
for(int i=0;i queue[++size]=data; aHD]k8m z
fixUp(size); pd?Mf=>#
} <]ox;-56
} ldf\;Qk
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private int size=0; :'Vf g[Uq
)705V|v
private int[] queue; TP*hd
vz&|J
public int get() { 7P} W *
return queue[1]; 9i:L&dN
} 5=-Q4d
yNPVOp*
public void remove() { IW5,7.
SortUtil.swap(queue,1,size--); e[1hz_v
fixDown(1); nkPh,X\N0
} =F|{#F
file://fixdown Cp\6W[2+B
private void fixDown(int k) { y RqL9t
int j; PrqlTT}Px
while ((j = k << 1) <= size) { l]5KN
if (j < size %26amp;%26amp; queue[j] j++; .xCZ1|+gG
if (queue[k]>queue[j]) file://不用交换 9X6h
break; 1C+13LE$U
SortUtil.swap(queue,j,k); p T?}Kc
k = j; RHW]Z Pr<
} }RF(CwZr(
} Q0sI(V#
private void fixUp(int k) { hPkp;a #
while (k > 1) { G[PtkPSJ
int j = k >> 1; #~]zhHI
if (queue[j]>queue[k]) @mCEHI{P
break; )_90UwWpj
SortUtil.swap(queue,j,k); T=DbBy0-
k = j; h,:m~0gmj
} )rU
} bIDj[-CDG
DeVv4D:}@
} k=$TGqQY?
,Zx0%#6
} dlh)gp;
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SortUtil： P;.W+WN
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package org.rut.util.algorithm; {lzWrUGO
o'aEY<mZ7
import org.rut.util.algorithm.support.BubbleSort; 2QcOR4_V
import org.rut.util.algorithm.support.HeapSort; B:Oa}/H
import org.rut.util.algorithm.support.ImprovedMergeSort; +.PxzL3?
import org.rut.util.algorithm.support.ImprovedQuickSort; z|J_b"u4
import org.rut.util.algorithm.support.InsertSort; NN{?z!
import org.rut.util.algorithm.support.MergeSort; /U*C\ xMm
import org.rut.util.algorithm.support.QuickSort; X,% 0/6*]
import org.rut.util.algorithm.support.SelectionSort; e)k9dOR
import org.rut.util.algorithm.support.ShellSort; VT)oLj/A
]jQutlg|
/** Wis~$"
* @author treeroot ?4}h&/
* @since 2006-2-2 a5^]20Fa
* @version 1.0 <NY^M!
*/ _.Nbt(mz
public class SortUtil { s\(k<Ks
public final static int INSERT = 1; F,F4nw<W
public final static int BUBBLE = 2; ;8&3 dm]
public final static int SELECTION = 3; Ta0|+IYk<
public final static int SHELL = 4; 4Z=_,#h4.
public final static int QUICK = 5; Rok7n1gW
public final static int IMPROVED_QUICK = 6; B]wk+8SMY.
public final static int MERGE = 7; qr^3R&z!}
public final static int IMPROVED_MERGE = 8; I_#kgp
public final static int HEAP = 9; e]"W!KcD9
M)+H{5bt
public static void sort(int[] data) { %(#y5yJ]
sort(data, IMPROVED_QUICK); n)-$e4u2
} dL 1tl
private static String[] name={ /t57!&
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" 2;`1h[,-^
}; /9*B)m"
N)|yu1S
private static Sort[] impl=new Sort[]{ ~ 'cmSiz-
new InsertSort(), xh,qNnGGi
new BubbleSort(), \ a<h/4#|
new SelectionSort(), k,6f &#x
new ShellSort(), jD]~ AwRJ
new QuickSort(), N^G Mp,8
new ImprovedQuickSort(), IqHV)A
new MergeSort(), x"=f+Mr
new ImprovedMergeSort(), GW@;}m(
new HeapSort() YUD`!C
}; BO;tCEV?
D,*3w'X!K
public static String toString(int algorithm){ 8 +/rlHp
return name[algorithm-1]; (0r3/t?DQ
} O, wJR
K(rWNO
public static void sort(int[] data, int algorithm) { _ QI\
impl[algorithm-1].sort(data); z+wA rPxc
} !u[9a;Sa#
CS5?Ti6
public static interface Sort { 'RR~7h
public void sort(int[] data); '~<m~UXvD#
} #aJ(m&
sN*N&XG
public static void swap(int[] data, int i, int j) { . B9iLI
int temp = data; LVfF[
data = data[j]; DB|Y
data[j] = temp; U^%Q}'UYym
} ]L $\ #
} 3?9IJ5p