[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; #UhH
} .#-F@0a
int i1=l; Rk[a|T&
int i2=mid+1; L~^5Ez6U
for(int cur=l;cur<=r;cur++){ q2s0g*z
if(i1==mid+1) cdh0b7tjn
data[cur]=temp[i2++]; r~2hTie
else if(i2>r) UfPHV%Wd
data[cur]=temp[i1++]; 1]eRragm"
else if(temp[i1] data[cur]=temp[i1++]; k|\M(Z*(P
else V.z8 ]iG
data[cur]=temp[i2++]; wMj#.Jh
} ]ly" K!1,
} GGhk~H4OP
9^ZtbmUf
} SJ<v< B
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改进后的归并排序: ~D>pu%F
b,YNCb]H
package org.rut.util.algorithm.support; 3F@P$4!#l
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import org.rut.util.algorithm.SortUtil; $xbW*w
k}Q<#
/** I8j:{*h
* @author treeroot kaXq.
* @since 2006-2-2 pmvd%X\f
* @version 1.0 ];4!0\M
*/ U: Wet,
public class ImprovedMergeSort implements SortUtil.Sort { as!a!1
($kw*H{Ah^
private static final int THRESHOLD = 10; \0d'y#Gp*
,aLwOmO
/* )0iN2L]U;
* (non-Javadoc) .1jiANY
* "GQ Q8rQ
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) %^HE^ &
*/ fO&`A:JY
public void sort(int[] data) { y:}qoT_.
int[] temp=new int[data.length]; TKv!wKI
mergeSort(data,temp,0,data.length-1); a!E22k?((z
} *$W&jfW
gWGDm~+
private void mergeSort(int[] data, int[] temp, int l, int r) { `vgaX,F*
int i, j, k; [GI~ &
int mid = (l + r) / 2; 8ZVQM7O
if (l == r) w|-3X
return; ]5c(:T F
if ((mid - l) >= THRESHOLD) "mf$E|
mergeSort(data, temp, l, mid); jt on\9
else ESIP+
insertSort(data, l, mid - l + 1); U`i5B;k}-
if ((r - mid) > THRESHOLD) P+}~6}wJE
mergeSort(data, temp, mid + 1, r); ft6)n T/"&
else 8zD>t~N2C
insertSort(data, mid + 1, r - mid); !43!JfD
l^9gFp~I
for (i = l; i <= mid; i++) { NBY|U{.g
temp = data; LWT\1#
} L|T?,^
for (j = 1; j <= r - mid; j++) { Rbf6/C
temp[r - j + 1] = data[j + mid]; , :#bo]3
} YE{ [f@i0
int a = temp[l]; .{h"0<x
int b = temp[r]; z6C(?R
for (i = l, j = r, k = l; k <= r; k++) { AtG~!)hG
if (a < b) { _(F-(X|
data[k] = temp[i++]; )6C+0b*
a = temp; dHXe2rTE;&
} else { $TXxhd 6
data[k] = temp[j--]; ovTL'j!
b = temp[j]; p>`rTaeZg
} Iz09O:ER
} 1xW!j!A;
} B/1j4/MS
Oh*~+/u}q
/** r |C.K
* @param data {fzX2qMZ]
* @param l BsIF3sS#9
* @param i [~s+,OO9)
*/ QDg5B6>$
private void insertSort(int[] data, int start, int len) { @@Ybg6.+*
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); N3|:MMl
} MO8}i?u=z
} FOsd{Fw
} U`ttT5;
} !H\oQv-I
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堆排序： N|DI k
qY#*LqV
package org.rut.util.algorithm.support; B>^6tdz
n[iwi
import org.rut.util.algorithm.SortUtil; ^?`fN'!p
A-CU%G9
/** S} m=|3%y
* @author treeroot $72eHdy/yl
* @since 2006-2-2 vPNbV
* @version 1.0 My8d%GfM
*/ l#KcmOz
public class HeapSort implements SortUtil.Sort{ mrP48#Y+l
x|rc[e%k
/* (non-Javadoc) lmzHE8MUNu
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Q"XDxa'7"
*/ \%a0Lp{ I
public void sort(int[] data) { 89FAh6uE
MaxHeap h=new MaxHeap(); Xxg|01
h.init(data); V/ G1C^'/
for(int i=0;i h.remove(); 73cb1kfPd
System.arraycopy(h.queue,1,data,0,data.length); Trv}YT.
} L@S\ rImw
4>jHS\jc
private static class MaxHeap{ O2{["c e
SH?McBxS
void init(int[] data){ #Q8_:dPY
this.queue=new int[data.length+1]; ,<rC,4-F<
for(int i=0;i queue[++size]=data; F}_b7|^
fixUp(size); _`udd)Y2
} +;KUL6
} %} ``:
##rkyd
private int size=0; 5^g*
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private int[] queue; =0g!Q
9p W~Gz
public int get() { zr.\7\v
return queue[1]; 6<];}M_{
} H -Mb:4
PAYw:/(P
public void remove() { O+}py{ st
SortUtil.swap(queue,1,size--); N#T'}>ty
fixDown(1); ^jMrM.GY
} + `|A/w
file://fixdown s:3[#&PQpN
private void fixDown(int k) { {cXr!N^K
int j; &>JP.//spi
while ((j = k << 1) <= size) { oP`l)`
if (j < size %26amp;%26amp; queue[j] j++; GTP'js
if (queue[k]>queue[j]) file://不用交换 6'Q{xJe?
break; <L-F3Buu
SortUtil.swap(queue,j,k); h3?>jE=H
k = j; fN&\8SPE
} /+Z*)q+SbT
} &u>dKf)5
private void fixUp(int k) { 3a?-UT!
while (k > 1) { QHR,p/p
int j = k >> 1; ~Gu$EqQ
if (queue[j]>queue[k]) 5kiW@{m
break; <w2h@ea
SortUtil.swap(queue,j,k); }=-0DSLVj
k = j; '=_(fa,
} yvYMk(LSF
} f% pT-#
*dw.=a9
} f{P1.?a
Jl{ 0q7b
} nI*.(+h
@_+aX.,
SortUtil： \Bo%2O%4
!D??Y^6bI
package org.rut.util.algorithm; <\&9Odqc
TR DQ+Z
import org.rut.util.algorithm.support.BubbleSort; *S,~zOYN
import org.rut.util.algorithm.support.HeapSort; YYe G9yR
import org.rut.util.algorithm.support.ImprovedMergeSort; P.]h`4
import org.rut.util.algorithm.support.ImprovedQuickSort; *fg2bz<~[B
import org.rut.util.algorithm.support.InsertSort; G}nJ3
import org.rut.util.algorithm.support.MergeSort; b>uD-CSA
import org.rut.util.algorithm.support.QuickSort; ~|+ ~/
import org.rut.util.algorithm.support.SelectionSort; [neuwdN
import org.rut.util.algorithm.support.ShellSort; E5ce=$o
"-Q+!byh
/** /lBK )(
* @author treeroot ~lj[> |\Oj
* @since 2006-2-2 .t "VsY|
* @version 1.0 _?~%+Oz/
*/ T8^9*]:@c!
public class SortUtil { A=<7*E
public final static int INSERT = 1; 2HeX( rB
public final static int BUBBLE = 2; &,&+p0CSI!
public final static int SELECTION = 3; hXTfmFy{n
public final static int SHELL = 4; hF2e--
public final static int QUICK = 5; !VGG2N8
public final static int IMPROVED_QUICK = 6; HRf;bKZ
public final static int MERGE = 7; FNQ<k[#K'~
public final static int IMPROVED_MERGE = 8; ,2FK$:M\
public final static int HEAP = 9; b80#75Bj>
Y(PCc}/\
public static void sort(int[] data) { | b'Ut)E
sort(data, IMPROVED_QUICK); E%mEfj7
} nfEbu4|
private static String[] name={ W==~9
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" 2R/|/>T v
}; F1Z'tjj+
LF7-??'
private static Sort[] impl=new Sort[]{ I*u3e
new InsertSort(), RAW;ze*"
new BubbleSort(), g|~px$<iY
new SelectionSort(), h(|T.
new ShellSort(), Z [!"x&H]h
new QuickSort(), T fLqxioqZ
new ImprovedQuickSort(), <,} h8;Fr
new MergeSort(), Q %o@s3~O
new ImprovedMergeSort(), {-Y;!
new HeapSort() cH5i420;aO
}; f[o~d`z
',EI[ ]+
public static String toString(int algorithm){ %Ig$:I(o
return name[algorithm-1]; ]oGd,v X
} <`nShP>vl
:j&enP5R(q
public static void sort(int[] data, int algorithm) { ~o'1PAW7
impl[algorithm-1].sort(data); xUdF.c
} YSD G!
`5Y*) q
public static interface Sort { f?5>V
public void sort(int[] data); /QXUD.( 8
} 3xyrWl
<h#*wy:o2
public static void swap(int[] data, int i, int j) { t`o"K
int temp = data; $_.t'8F
data = data[j]; 5Tl5T&
data[j] = temp; b| L;*<KU
} s#X/ F
} J M`w6}