[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; ofIw7D*h
} I#U"DwM
int i1=l; .PJCBTe
int i2=mid+1; 9et%Hn.K'
for(int cur=l;cur<=r;cur++){ -"Hy%wE
if(i1==mid+1) iR(jCD?) Y
data[cur]=temp[i2++]; F2#s^4Ii
else if(i2>r) c mI&R(
data[cur]=temp[i1++]; B8sc;Z.
else if(temp[i1] data[cur]=temp[i1++]; 8%W(",nd
else {,`)
data[cur]=temp[i2++]; MmPLJ
} @+P7BE}
} F.[E;gOTo
>GV= %
} mxQPOu
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改进后的归并排序: JNZ O7s
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package org.rut.util.algorithm.support; E+$%88
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import org.rut.util.algorithm.SortUtil; ]> dCt<
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/** XV|u!'Ey
* @author treeroot U3UDA
* @since 2006-2-2 dnW#"
* @version 1.0 XzF-g*e
*/ mv;;0xH
public class ImprovedMergeSort implements SortUtil.Sort { ;:5Ahfo \
5U!yc7eBI/
private static final int THRESHOLD = 10; ^;@Q3~DpP%
VwKo)zH
/* .lt|$["
* (non-Javadoc) /+g9C(['
* ft"t
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 8'}D/4MUr
*/ (m3 <)
public void sort(int[] data) { Je1'0h9d
int[] temp=new int[data.length]; ZS\~GQbG
mergeSort(data,temp,0,data.length-1); nB .?=eUa
} n |e=7?H8
zOfMKrRG
private void mergeSort(int[] data, int[] temp, int l, int r) { ,K>q{H^
int i, j, k; gf\F%VmSN
int mid = (l + r) / 2; c?H@HoF
if (l == r) 9ER!K
return; V9%!B3Sb
if ((mid - l) >= THRESHOLD) A<$w }Fy;
mergeSort(data, temp, l, mid); {I:nza
else QRL+-)DMc
insertSort(data, l, mid - l + 1); ^0fe:ac;
if ((r - mid) > THRESHOLD) P1>?crw
mergeSort(data, temp, mid + 1, r); [42EqVR
else ![l`@NH[U
insertSort(data, mid + 1, r - mid); )U5Ba^"fI
q0y#Y
for (i = l; i <= mid; i++) { d09qZj>
temp = data; 4/J"}S
} (aTpBXGr=
for (j = 1; j <= r - mid; j++) { |K,[[D<R
temp[r - j + 1] = data[j + mid]; f(Uo?_as
} l =Is-N`
int a = temp[l]; Fd(o8z8Q
int b = temp[r]; D]StDOmM
for (i = l, j = r, k = l; k <= r; k++) { Sz'H{?"
if (a < b) { !bGMVw6_
data[k] = temp[i++]; |J:kL3g
a = temp; .wvgHi
} else { mi&mQQ
data[k] = temp[j--]; _p^&]eQ+k#
b = temp[j]; g* DBW,
} %SKJ#b
} fB"It~ p
} L[aA4`
<[Y@<
/** qw35LyL
* @param data mVVL[z2+
* @param l %Xjg/5G-
* @param i ^W*3S[-`g
*/ Zg;%$ kSQ
private void insertSort(int[] data, int start, int len) { x$+g/7*
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); ^w6~?'}
} -hpC8YS
} A=bBI>GEYP
} ,%4~ulKMn
} RQQ\y`h`
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堆排序： sRaTRL2
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package org.rut.util.algorithm.support; T'${*NVn
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import org.rut.util.algorithm.SortUtil; .\}nDT
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/** ]!'9Y}9a
* @author treeroot \@F~4,VT
* @since 2006-2-2 n1r'Y;G
* @version 1.0 1|/-Ff"1@
*/ KbM1b
public class HeapSort implements SortUtil.Sort{ 56 [+;*
RElIWqgY
/* (non-Javadoc) JGG(mrvR
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) /?_5!3KJ
*/ 07#e{
public void sort(int[] data) { z( ^ r
MaxHeap h=new MaxHeap(); rJw Ws
h.init(data); E9~}%&
for(int i=0;i h.remove(); s~n@|m9k
System.arraycopy(h.queue,1,data,0,data.length); #Zj3SfU~`
} 0$:jZ/._
\?~cJMN
private static class MaxHeap{ @D+2dT0[M
}zyh!
void init(int[] data){ Y wu > k
this.queue=new int[data.length+1]; $ )orXe|
for(int i=0;i queue[++size]=data; \SyG#.$
fixUp(size); HMl M!Xk?
} ;nbbKQ]u
} 4"d'iY
R@A"U[*
private int size=0; DTo P|P
SK t&BnW
private int[] queue; J|.n bSE
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public int get() { 9`T2
return queue[1]; {N'<_%cu
} v]c+|nRs
-n~%v0D8c
public void remove() { ':#DROe!
SortUtil.swap(queue,1,size--); -W.bOr
fixDown(1); ~U+W4%f8
} "/0Vvy_|
file://fixdown xV>sc;PEb
private void fixDown(int k) { ,lb >
int j; mIah[~G
while ((j = k << 1) <= size) { f?W"^6Df
if (j < size %26amp;%26amp; queue[j] j++; SmCtwcB1
if (queue[k]>queue[j]) file://不用交换 W,bu=2K6
break; ,u^%[ejH
SortUtil.swap(queue,j,k); H{I,m-
k = j; g[ O6WZ!F_
} o[B"J96b
} b:(t22m#?
private void fixUp(int k) { BNq6dz$J
while (k > 1) { bsdT>|gW
int j = k >> 1; T07 AH
if (queue[j]>queue[k]) 8T}Dn\f
break; -muP.h/
SortUtil.swap(queue,j,k); k\Z@B!VAq
k = j; ~'VVCtA
} {ug*
} vpz l{
wj 15Og?
} j5MUP&/g3
}S 6h1X
} rj/1AK
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SortUtil： FE3uNfQs|
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package org.rut.util.algorithm; :Ny^-4-N
Y lhKP;
import org.rut.util.algorithm.support.BubbleSort; #Q$e%VJ(c1
import org.rut.util.algorithm.support.HeapSort; W<T Ui51Y
import org.rut.util.algorithm.support.ImprovedMergeSort; (N?nOOQ
import org.rut.util.algorithm.support.ImprovedQuickSort; P#-p*4
import org.rut.util.algorithm.support.InsertSort; 349BQ5ND
import org.rut.util.algorithm.support.MergeSort; to(lE2`.da
import org.rut.util.algorithm.support.QuickSort; x\aCZ
import org.rut.util.algorithm.support.SelectionSort; [i8Ju
import org.rut.util.algorithm.support.ShellSort; qflOi8
8f>v[SQ"
/** 7[:?VXQ
* @author treeroot lY[\eQ 1:
* @since 2006-2-2 yi*EE%
* @version 1.0 ?G 'sb}.
*/ fU|4^p)
public class SortUtil { Zx^R-9
public final static int INSERT = 1; (o4':/es
public final static int BUBBLE = 2; #@m6ag.
public final static int SELECTION = 3; ;jh.\a_\
public final static int SHELL = 4; uTNy{RBD+
public final static int QUICK = 5; : `,#z?Rk
public final static int IMPROVED_QUICK = 6; J~)JsAXAI
public final static int MERGE = 7; ? kCo/sW
public final static int IMPROVED_MERGE = 8; !*PX-
public final static int HEAP = 9; T@mYHKu
g=jB'h?
public static void sort(int[] data) { wU-Cb<^
sort(data, IMPROVED_QUICK); $ZlzS`XF7
} oF_ '<\ly=
private static String[] name={ \ESNfL5
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" >=/DCQ$
}; &Z%'xAOGR
o.wXaS8
private static Sort[] impl=new Sort[]{ >N"=10
new InsertSort(), s){R/2O3F
new BubbleSort(), ~h$ H@&5
new SelectionSort(), nPhREn!
new ShellSort(), `KUL4) g~
new QuickSort(), LBIEG_/m
new ImprovedQuickSort(), .J?RaH{i
new MergeSort(), s8SCEpz
new ImprovedMergeSort(), et<@3wyd]
new HeapSort() WnhH]WY
}; Ct]? /
7-mo\jw<
public static String toString(int algorithm){ 4%7Oaf>9
return name[algorithm-1]; d>wG6Z,|
} 'y7<!uo?
dTqL[?wH?
public static void sort(int[] data, int algorithm) { x$KQ*P~q
impl[algorithm-1].sort(data); z8 K#G%,:
} 3iw.yR
E//*bmww
public static interface Sort { lHO.pN`2
public void sort(int[] data); EUS^Gtc
} GK&R.R]
!J(6E:,b#
public static void swap(int[] data, int i, int j) { [Vj|fy4
int temp = data; !X 0 (4^
data = data[j]; aZ}z/.b]
data[j] = temp; 'grb@+w(
} Vu,:rPqI
} Ox6^=D"