[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; )|Ka'\xr
} I3}I7oc_
int i1=l; N[yS heT
int i2=mid+1; IhK%.B{dZ
for(int cur=l;cur<=r;cur++){ "|PX5
if(i1==mid+1) ~C?)- ]bF
data[cur]=temp[i2++]; HisH\z/i5)
else if(i2>r) Enp;-wG:-
data[cur]=temp[i1++]; 7--E$!9O,
else if(temp[i1] data[cur]=temp[i1++]; h6tYy_(G
else tC7 4=
data[cur]=temp[i2++]; =>GGeEL
} 9*r l7
} e8z?) 4T
<DEu]-'>
} $bZ5@)E
8N4E~*>C
改进后的归并排序: 3i9~'j;F3
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package org.rut.util.algorithm.support; 5mm&l+N)
%Bg>=C)^(1
import org.rut.util.algorithm.SortUtil; w@,v$4Oi
mZjP;6
/** (/i|3P
* @author treeroot RgzzbW
* @since 2006-2-2 DYgz;Y/%l
* @version 1.0 >;fn,9w
*/ 4-C'2?
public class ImprovedMergeSort implements SortUtil.Sort { sAF="uB
F-D$Y?m
private static final int THRESHOLD = 10; t\n'Kuk`
2>Qy*
/* [X@JH6U r
* (non-Javadoc) i=V2 /W}
* jk%H+<FU`
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) k<rJm P{
*/ 6ywOL'OBM
public void sort(int[] data) { }%0X7'
int[] temp=new int[data.length]; J!@R0U.
mergeSort(data,temp,0,data.length-1); FY/F}C,o
} GP`sOPr
s/P+?8'9
private void mergeSort(int[] data, int[] temp, int l, int r) { qGP}
int i, j, k; GX*9R>
int mid = (l + r) / 2; j%81q
if (l == r) l}D /1~d
return; S&c5Q*->[
if ((mid - l) >= THRESHOLD) "#w%sG^_
mergeSort(data, temp, l, mid); +IlQZwm~
else -<(RYMk*)
insertSort(data, l, mid - l + 1); df&.!7_R`
if ((r - mid) > THRESHOLD) VaO[SW^
mergeSort(data, temp, mid + 1, r); !;Pp)SRzKG
else JX#0<U|L
insertSort(data, mid + 1, r - mid); .(yJ+NU
nB4+*=$E+-
for (i = l; i <= mid; i++) { #jPn7
temp = data; caV DV
} OLqynY
for (j = 1; j <= r - mid; j++) { ^szi[Cj
temp[r - j + 1] = data[j + mid]; lZ) qV!<
} U7-*]ik
int a = temp[l]; f#gV>.P;h\
int b = temp[r]; 2_)gJ_kP
for (i = l, j = r, k = l; k <= r; k++) { sR)jZpmC(
if (a < b) { 9d!mGnl
data[k] = temp[i++]; nt%p@e!,
a = temp; 4Ujy_E?^
} else { ej\Sc7.
data[k] = temp[j--]; Epm8S}6K
b = temp[j]; &+yoPF
} ;ssI8\LG
} y8} /e@&
} ^S!;snhn
M6].V*k'2
/** 8uA!Vrp3
* @param data Jw{duM;]
* @param l #RHt;SFx
* @param i Af`Tr6)
*/ gq="&
private void insertSort(int[] data, int start, int len) { o1uM(
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); 6.6?Rp".
} eK}GBBdO
} B|'}HBkP
} Tf('iZ2+
} wNmC1HOh
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堆排序： #G=AD/z
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package org.rut.util.algorithm.support; [ B*r{
f85~[3 J
import org.rut.util.algorithm.SortUtil; n+k,:O5
Z{?T1 =n
/** >=.3Vydi1
* @author treeroot Rgl cd
* @since 2006-2-2 {xh5s<uOj
* @version 1.0 UKPr[
*/ u^W!$OfZpp
public class HeapSort implements SortUtil.Sort{ ^sqzlF
M0`1o p1
/* (non-Javadoc) [8K :ml
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Sf@xP.d
*/ dqO]2d
public void sort(int[] data) { =r3g:j/>q
MaxHeap h=new MaxHeap(); =y`-:j\
h.init(data); -"?~By}<C
for(int i=0;i h.remove(); W{~ y< `D
System.arraycopy(h.queue,1,data,0,data.length); s^Xs*T@~h
} t]?{"O1rC
]bYmM@
private static class MaxHeap{ g1(5QWb
+[4y)y`
void init(int[] data){ U]g9t<jD
this.queue=new int[data.length+1]; P!!O~P
for(int i=0;i queue[++size]=data; kfZ(:3W$
fixUp(size); 0|8cSE< i
} D|^N9lDaQ
} [a?bv7Kz
A;o({9VH`Z
private int size=0; e>bARK<
~ H/ZiBL@
private int[] queue; p"j&s
(!YJ:,!so
public int get() { $aN%[
return queue[1]; pgZQ>%
} QS1lg
($W%&(:/
public void remove() { }>V=J aG
SortUtil.swap(queue,1,size--); *zW]IQ'A
fixDown(1); Ex skd}
} v5U'ky:
file://fixdown 9<3fH J?vq
private void fixDown(int k) { #zBqj;p
int j; u7j,Vc'~
while ((j = k << 1) <= size) { $\bVu2&I
if (j < size %26amp;%26amp; queue[j] j++; 5fYWuc9}z
if (queue[k]>queue[j]) file://不用交换 }w-M.
break; R~fk/T?
SortUtil.swap(queue,j,k); YHMJ5IM@.
k = j; B]6Lbp"oo
} *xY3F8
} -eIo
private void fixUp(int k) { IM5[O}aq
while (k > 1) { g:GywXW
int j = k >> 1; ZSyXzop
if (queue[j]>queue[k]) CF@*ki3X
break; oJ`=ob4WDo
SortUtil.swap(queue,j,k); ]'w5s dP
k = j; V`HnFAW
} kk4+>mk
} zQ<;3+*
nHRk2l|
} 4:pgZz!
4^ U%` 1
} F^S]7{
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SortUtil： 4=;j.=>0X
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package org.rut.util.algorithm; "S*@._
xtKU;+#
import org.rut.util.algorithm.support.BubbleSort; aAG']y
import org.rut.util.algorithm.support.HeapSort; pZ3sp!
import org.rut.util.algorithm.support.ImprovedMergeSort; md!!$+a%|
import org.rut.util.algorithm.support.ImprovedQuickSort; |=![J?
import org.rut.util.algorithm.support.InsertSort; A|YgA66M
import org.rut.util.algorithm.support.MergeSort; (:?bQA'Td
import org.rut.util.algorithm.support.QuickSort; )=MK&72r
import org.rut.util.algorithm.support.SelectionSort; ?~E"!
import org.rut.util.algorithm.support.ShellSort; }maD8,:t
dQ9W40g1
/** 1eEML"
* @author treeroot }pnp._j
* @since 2006-2-2 z( }w|
* @version 1.0 u3E =r
*/ <5P*uZ
public class SortUtil { 5h0Hk<N
public final static int INSERT = 1; 5X>~39(r
public final static int BUBBLE = 2; \NEk B&^n
public final static int SELECTION = 3; l&:8 'k+%=
public final static int SHELL = 4; c_?^:xs:d
public final static int QUICK = 5; ,2+d+Zuh
public final static int IMPROVED_QUICK = 6; o?j8"^!7
public final static int MERGE = 7; xXa4t4gR
public final static int IMPROVED_MERGE = 8; AE~@F4MK
public final static int HEAP = 9; dqo-.,=
+v:]#1
public static void sort(int[] data) { :Ea|FAeK8
sort(data, IMPROVED_QUICK); ;Bj&9DZd
} a1/+C$ oB
private static String[] name={ N&kUTSd
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" * fj`+J
}; uOy/c 8`
v?}0h5
private static Sort[] impl=new Sort[]{ $xq04ejJ
new InsertSort(), OLm@-I*
new BubbleSort(), ^;.u}W
new SelectionSort(), :N"&o(^
new ShellSort(), qu dY9_
new QuickSort(), );6f8H@G
new ImprovedQuickSort(), ?%Tx% dB
new MergeSort(), MPy><J
new ImprovedMergeSort(), `Syfl^9B
new HeapSort() 4z26a
}; ~J>;l s1
BHYguS^qz
public static String toString(int algorithm){ .XiO92d9
return name[algorithm-1]; vyB{35p$
} (v|<" tv
\_6
public static void sort(int[] data, int algorithm) { D!/ 4u0m
impl[algorithm-1].sort(data); /h.{g0Xc
} xpo^\E?2
#62ThH~
public static interface Sort { hsS&|7Pt
public void sort(int[] data); N:k>V4oE
} tcsb]/my
gsM^Pu09ud
public static void swap(int[] data, int i, int j) { |G$-5 7fk
int temp = data; sPeTW*HeR
data = data[j]; [rK`BnJX
data[j] = temp; ^blw\;LB
} o$Nhx_F
} e*PUs