[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; H{vKk
} NBY|U{.g
int i1=l; X<}}DZSu a
int i2=mid+1; Ly+UY.v"
for(int cur=l;cur<=r;cur++){ _E`+0;O
if(i1==mid+1) <3x%-m+p4
data[cur]=temp[i2++]; 32<D9_
else if(i2>r) Qk:Lo*!
data[cur]=temp[i1++]; mGj)Zrx>
else if(temp[i1] data[cur]=temp[i1++]; 5M~{MdF|.
else `a4&_`E,p
data[cur]=temp[i2++]; 5b7(^T^K
} kFWwz^x
} {h7 vJ^
3W%6n-*u
} eKvr1m- -
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改进后的归并排序: )*;Tt @'y
5'I+%66?h$
package org.rut.util.algorithm.support; Giv,%3'
%7 bd}sJ#
import org.rut.util.algorithm.SortUtil; *y?HaU
#`*uX6C
/** j#n ]q{s4
* @author treeroot {,Q)D$i
* @since 2006-2-2 phuiLW{&
* @version 1.0 *9EwZwE_K
*/ Yt]`>C[|D
public class ImprovedMergeSort implements SortUtil.Sort { 2!J#XzR0W
i D IY|
private static final int THRESHOLD = 10; I?3b}#&V9
KFd +7C9
/* 7Ed0BJTa
* (non-Javadoc) 112WryS
* qjP~F
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) W^tD6H;
*/ '" "v7
public void sort(int[] data) { A-CU%G9
int[] temp=new int[data.length]; S} m=|3%y
mergeSort(data,temp,0,data.length-1); $72eHdy/yl
} vPNbV
h9H z6 >
private void mergeSort(int[] data, int[] temp, int l, int r) { Yub}AuU`v
int i, j, k; Cdz&'en^
int mid = (l + r) / 2; _Sr7b#)o
if (l == r) iWf+wC|
return; G&g;ROgY
if ((mid - l) >= THRESHOLD) 0+FPAqX
mergeSort(data, temp, l, mid); cmG27\cRO
else ;{sZDjev>
insertSort(data, l, mid - l + 1); d&FXndC4F
if ((r - mid) > THRESHOLD) BV~J*e
mergeSort(data, temp, mid + 1, r); $vegU]-R
else MeEa|.
insertSort(data, mid + 1, r - mid); TUcFx_
"/Qz?1>l+
for (i = l; i <= mid; i++) { M%S7cIX ]F
temp = data; ?'MkaG0g
} o72r `2
for (j = 1; j <= r - mid; j++) { -qIi.]/f"9
temp[r - j + 1] = data[j + mid]; f CU]
} *#Cx-J
int a = temp[l]; @Z~YFnEJi
int b = temp[r]; \Ggh 95y
for (i = l, j = r, k = l; k <= r; k++) { OTXZdAv
if (a < b) { Ib#-M;{
data[k] = temp[i++]; bej(Ds0
a = temp; ]->"4,}
} else { !/XNpQP
data[k] = temp[j--]; !<p,G`r
b = temp[j]; u5oM;#{@-
} |2j,
} = j1Jl^[
} >a?Bk4w
m)tu~neM
/** JQ1MuE'
* @param data ]/=RABi
* @param l S0^a)#D &
* @param i 7S a9
*/ C t,p
private void insertSort(int[] data, int start, int len) { ^^N|:80
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); 4Hj)Av<O(
} c;VqEpsbl
} 'Lrn<
} 6m:$mhA5
} GmHDG-
[Yt{h9
堆排序： hC\ l \y
(s3k2Z
package org.rut.util.algorithm.support; E!9WZY
k H.dtg_
import org.rut.util.algorithm.SortUtil; PILpWhjL$9
A& iv
/** B)JMughq_
* @author treeroot JQ03om--(
* @since 2006-2-2 :wC\IwG~CE
* @version 1.0 :0J`4
*/ >(Y CZ
public class HeapSort implements SortUtil.Sort{ uHgq"e
a{nR:zPE
/* (non-Javadoc) ` 2W^Ui,4
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) M=^d
*/ a^%iAe
public void sort(int[] data) { pm6#azQ
MaxHeap h=new MaxHeap(); p) 8S]p]
h.init(data); \Bo%2O%4
for(int i=0;i h.remove(); h=#w< @
System.arraycopy(h.queue,1,data,0,data.length); PQ&*(G
} hq=;ZI
P.]h`4
private static class MaxHeap{ NrqJf-ldo
pa>C}jk}6
void init(int[] data){ (;{X-c}?
this.queue=new int[data.length+1]; sW]_Ky.]
for(int i=0;i queue[++size]=data; "-Q+!byh
fixUp(size); k =! Q
} {MgRi7
} xuioU
;U* /\+*h
private int size=0; /v 8"i^;}
Q~N,QMr)k&
private int[] queue; 981-[ga`Y
-<#) ]um
public int get() { N"70P/
return queue[1]; F3|^b{'zO
} 4aXIRu%#7
1/}H 0\9'
public void remove() { =-U0r$sK+F
SortUtil.swap(queue,1,size--); sO.MUj;
fixDown(1); gm9*z.S\'
} 0kE[=#'.'
file://fixdown F&B\ X
private void fixDown(int k) { kXz~ez 7
int j; CHgip&(.F
while ((j = k << 1) <= size) { U{2xgNJ
if (j < size %26amp;%26amp; queue[j] j++; i~';1 .g
if (queue[k]>queue[j]) file://不用交换 f'*-<sSr
break; !&:=sA
SortUtil.swap(queue,j,k); 5u!\c(TJ+
k = j; c*IrZm
} Pq /5Dy
} (0 T!-hsP
private void fixUp(int k) { \L Q+ n+
while (k > 1) { T fLqxioqZ
int j = k >> 1; J"r?F0
if (queue[j]>queue[k]) (D>_O$o
break; V^_A{\GK
SortUtil.swap(queue,j,k); {-Y;!
k = j; :iE b^F}
} `ASDUgx Mq
} JK/{IkF
:;{M0
} QH'*MY
:&BPKqKp
} Q}AZkZ
q`<vY'&1
SortUtil： <[dcIw<7
& zDuh[j}
package org.rut.util.algorithm; f.6>6%l
dNe!X0[
import org.rut.util.algorithm.support.BubbleSort; (y9KO56.V&
import org.rut.util.algorithm.support.HeapSort; dFz"wvu` o
import org.rut.util.algorithm.support.ImprovedMergeSort; 9?l a5
import org.rut.util.algorithm.support.ImprovedQuickSort; dtTn]}J
import org.rut.util.algorithm.support.InsertSort; 3TwjC:Yhv2
import org.rut.util.algorithm.support.MergeSort; VF?H0}YSHb
import org.rut.util.algorithm.support.QuickSort; j`_S%E%X
import org.rut.util.algorithm.support.SelectionSort; @A,8>0+
import org.rut.util.algorithm.support.ShellSort; sfXFh
ZM<6yj"f
/** 0*{(R#
* @author treeroot \YvG+7a
* @since 2006-2-2 OUBGbld
* @version 1.0 D3Q+K
*/ {)" 3
public class SortUtil { (|QJ[@?q
public final static int INSERT = 1; gFaZ ._
public final static int BUBBLE = 2; D$ds[if$U,
public final static int SELECTION = 3; 7H Har'=T
public final static int SHELL = 4; o}AXp@cqi
public final static int QUICK = 5; !^arWH[od
public final static int IMPROVED_QUICK = 6; rS1gFGrj
public final static int MERGE = 7; ('&lAn
public final static int IMPROVED_MERGE = 8; bn*:Bn1
public final static int HEAP = 9; gVG^R02#<k
65LtCQ}
public static void sort(int[] data) { *;A ;)'
sort(data, IMPROVED_QUICK); D \ rns+
} |1@O>GG
private static String[] name={ qTuR[(
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" Mq> 4!
}; b31$i 5{
:;%Jm
private static Sort[] impl=new Sort[]{ o5Oig
new InsertSort(), /2K"Mpf8
new BubbleSort(), K6v~!iiK$
new SelectionSort(), I5"wa:Z
new ShellSort(), ^+(5[z
new QuickSort(), Q>1BOH1by
new ImprovedQuickSort(), SEgw!2H
new MergeSort(), h#0n2o#
new ImprovedMergeSort(), ;$D,w
new HeapSort() iK}p#"si
}; KsULQJ#,
C*Q7@+&
public static String toString(int algorithm){ UQ0!tFx
return name[algorithm-1]; 4=,J@N-
} "VaWZ*
=4_}.
public static void sort(int[] data, int algorithm) { R_EU|a
impl[algorithm-1].sort(data); Ct=bZW"j/
} VEWW[T
4%0s p
public static interface Sort { hW*o;o7u
public void sort(int[] data); y [Vd*8
} +<E#_)}`D6
P'~`2W0sz
public static void swap(int[] data, int i, int j) { >2#<gp3
int temp = data; Fs]N9],=I
data = data[j]; ?b_E\8'q]
data[j] = temp; xw*e`9vAe
} <F3{-f'Rx
} OX"Na2-el