[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; $fpq 3
} ~aXqU#8
int i1=l; ;+I/I9~
int i2=mid+1; <N(oDaU
for(int cur=l;cur<=r;cur++){ axk"^gps
if(i1==mid+1) s 1ge0~p3
data[cur]=temp[i2++]; %Td )0Lqp
else if(i2>r) vNW jH!'
data[cur]=temp[i1++]; ZL< MC~
else if(temp[i1] data[cur]=temp[i1++]; \#rO!z d
else CN2_bz
data[cur]=temp[i2++]; *<'M!iRC
} o]LRzI
} /EMJSr
1mSaS4!"B
} vZ#!uU^a:
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改进后的归并排序: Q2p)7G
\]Dt4o*yZ
package org.rut.util.algorithm.support; I<=Df5M
&48_2Q"{
import org.rut.util.algorithm.SortUtil; i1oKrRv
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/** o+?rI p
* @author treeroot f&hwi:t
* @since 2006-2-2 C*I(|.i@
* @version 1.0 -#29xRPk
*/ w# *1/N
public class ImprovedMergeSort implements SortUtil.Sort { .A1\J@b
e#/kNHl
private static final int THRESHOLD = 10; *8ExRQZ$
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/* 3"UsZyN:
* (non-Javadoc) v8I{XU@%
* ibdO*E
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) '+*-s7o{
*/ 2uk x (Z
public void sort(int[] data) { 1j\aH&)GH
int[] temp=new int[data.length]; _ jAo:K_Z
mergeSort(data,temp,0,data.length-1); =C f(B<u
} Dz_eB"}
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private void mergeSort(int[] data, int[] temp, int l, int r) { |c2v%'J2G
int i, j, k; 8@M'[jT
int mid = (l + r) / 2; np WEop>
if (l == r) ]$M<]w,IJ2
return; cUK\x2
if ((mid - l) >= THRESHOLD) 'FzN[% K"
mergeSort(data, temp, l, mid); sl/)|~3!8
else M;Wha;%E"
insertSort(data, l, mid - l + 1); )~rB}>^Z
if ((r - mid) > THRESHOLD) i_F$&?)
mergeSort(data, temp, mid + 1, r); QfQ\a%cc
else }t>q9bZ9z
insertSort(data, mid + 1, r - mid); GIv){[i
K`nJVc
for (i = l; i <= mid; i++) { nSY-?&l6P
temp = data; HXJ9xkrr
} -U>7 H`5
for (j = 1; j <= r - mid; j++) { l[/q%Ca'>
temp[r - j + 1] = data[j + mid]; fw{,bJ(U
} .h;Se
int a = temp[l]; {5Eyr$
int b = temp[r]; !U BVPR*
for (i = l, j = r, k = l; k <= r; k++) { 5]7&IDA]]9
if (a < b) { 1]\TI7/n
data[k] = temp[i++]; b0a}ME&1
a = temp; MFg'YA2/
} else { C%ytkzG_
data[k] = temp[j--]; V+w u
b = temp[j]; hkW{88
} PM4>ThQ
} ^p_u.P
} HPa|uDVv
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/** .yVnw^gu
* @param data 2W3W/> 2h
* @param l dALK0U
* @param i B;-2$ 77
*/ c6b0*!D"}
private void insertSort(int[] data, int start, int len) { 0k?Sq#7q
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); C>*n9l[M~
} XKq@]=\F
} Qa$NBNxKl
} 74zSP/G'
} ;IC'Gq
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堆排序： >IR$e=5$
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package org.rut.util.algorithm.support; fQQ|gwVki
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import org.rut.util.algorithm.SortUtil; JCQ:+eqt
\8"QvC]
/** ;aK.%-s-Z
* @author treeroot jX|=n.#q
* @since 2006-2-2 Q#WE|,a
* @version 1.0 yx0Q+Sm1:
*/ O3!d(dY=_
public class HeapSort implements SortUtil.Sort{ ?mOg@) wx
#[ :w
/* (non-Javadoc) *fP(6e#G,
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) >QI~`MiI
*/ S!7g)
public void sort(int[] data) { iMWW%@U^=
MaxHeap h=new MaxHeap(); \$;~74}
h.init(data); Z5>V{o
for(int i=0;i h.remove(); <F=Dj*]
System.arraycopy(h.queue,1,data,0,data.length); Lp~^*j(
} b~W)S/wF$P
ZPF7m{S
private static class MaxHeap{ Lht[g9
uu>lDvR*
void init(int[] data){ (/fT]6(
this.queue=new int[data.length+1]; E&%jeR
for(int i=0;i queue[++size]=data; \Hs|$
fixUp(size); ~JE|f 7
} 79z)C35~
} +a]j[#
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private int size=0; *mV&K\_
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private int[] queue; k ]bPI$
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public int get() { 6_U|(f
return queue[1]; _j 5N=I{U
} >tEK+Y|N}
nx;$dxx_Ws
public void remove() { 4p x_ZD#J
SortUtil.swap(queue,1,size--); aQmfrx
fixDown(1); u&SZlkf6%
} hwDXm9
file://fixdown p!GZCf,
private void fixDown(int k) { Y*\6o7
int j; a*Jn#Mx<M
while ((j = k << 1) <= size) { ( 2zeG`
if (j < size %26amp;%26amp; queue[j] j++; &A"e,h(^
if (queue[k]>queue[j]) file://不用交换 p1 4d,}4W
break; .Qfnd#
SortUtil.swap(queue,j,k); tzNaw %\
k = j; u 6(GM
} 6+Jry@
} 9>{t}Id
private void fixUp(int k) { <~O}6HQ#
while (k > 1) { c `ud;lI
int j = k >> 1; eKJ:?Lxv;
if (queue[j]>queue[k]) M,JA;a, _
break; !a4cjc(
SortUtil.swap(queue,j,k); qwP$~Bj
k = j; &>V/X{>$`K
} 2C{/`N
} _-6e0srZ
hpjUkGm5
} b=_{/F*b?
?C~X@sq
} #|ddyCg2
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SortUtil： !Y|8z\Q
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package org.rut.util.algorithm; Oh-Fp-v87
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import org.rut.util.algorithm.support.BubbleSort; $vqU|]J`
import org.rut.util.algorithm.support.HeapSort; 2R] XH 0
import org.rut.util.algorithm.support.ImprovedMergeSort; 0T1ko,C!,e
import org.rut.util.algorithm.support.ImprovedQuickSort; *) } :l
import org.rut.util.algorithm.support.InsertSort; '&)D>@g
import org.rut.util.algorithm.support.MergeSort; QnP{$rT
import org.rut.util.algorithm.support.QuickSort; &PSTwZd
import org.rut.util.algorithm.support.SelectionSort; yP%o0n/"x
import org.rut.util.algorithm.support.ShellSort; 55,=[
4$F:NW,v:)
/** shy
* @author treeroot mw Z'=H
* @since 2006-2-2 "SLvUzO>q
* @version 1.0 5=m3J!?
*/ HlF}
public class SortUtil { UE{,.s
public final static int INSERT = 1; bk0Y
public final static int BUBBLE = 2; []rT? -
public final static int SELECTION = 3; }/49T
public final static int SHELL = 4; ?n&$m
public final static int QUICK = 5; /_HwifRQ
public final static int IMPROVED_QUICK = 6; d>;2,srUf
public final static int MERGE = 7; hMz&JJ&B
public final static int IMPROVED_MERGE = 8; ) (+)Q'*
public final static int HEAP = 9; FXeV6zfrE
=Iy/cHK
public static void sort(int[] data) { cP,;Qbe
sort(data, IMPROVED_QUICK); PlF!cr7:4
} ZXh~79
private static String[] name={ VOg/VGJ
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" | yS5[?.`
}; ?LR"hZ>
}}s8D>;G~
private static Sort[] impl=new Sort[]{ N:OD0m%`)
new InsertSort(), k3C"
new BubbleSort(), Pf{`/UlD
new SelectionSort(), u\:rY)V
new ShellSort(), @c0n2 Xcr
new QuickSort(), Tt`L(oF
new ImprovedQuickSort(), H/pcXj
new MergeSort(), 6hLNJ
new ImprovedMergeSort(), )>?! xx_`
new HeapSort() -`Da`ml
}; A"0wvk)UcY
(eki X*y
public static String toString(int algorithm){ >H)^6sJ;%b
return name[algorithm-1]; {zY`h6d
} @T5YsX]qb7
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public static void sort(int[] data, int algorithm) { 8g.AT@ ,Q
impl[algorithm-1].sort(data); UBL(Nr
} IvFR <n
//~POm
public static interface Sort { 9jqO/_7R+
public void sort(int[] data); 6aRGG+H
} P$6W`^DZ
]c5DOv&
public static void swap(int[] data, int i, int j) { B'<!k7Ewy
int temp = data; \y[Bu^tk
data = data[j]; lfXH7jL2~
data[j] = temp; yLjV[qP
} +g)_4fV0|
} KlY,NSlQ