[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; |Tc4a4jS
} gBi3^GxjM?
int i1=l; 9Li*L&B)
int i2=mid+1; =>B"j`oR
for(int cur=l;cur<=r;cur++){ @fJsRWvGq
if(i1==mid+1) R ZQH#+*t}
data[cur]=temp[i2++]; 80_w_i+
else if(i2>r) j6Sg~nRh
data[cur]=temp[i1++]; <+-n lK4
else if(temp[i1] data[cur]=temp[i1++]; 5lJL[{
else ^/#G,MxNy
data[cur]=temp[i2++]; -{k8^o7$
} N0Y4m_dm*
} y.J>}[\&x
kY'Wf`y(
} L!zdrCM
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改进后的归并排序: Z\EA!Cs3
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package org.rut.util.algorithm.support; q(:L8nKT]
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import org.rut.util.algorithm.SortUtil; A8{ xZsH
LUId<We
/** [}ja\!P
* @author treeroot +:-xV
* @since 2006-2-2 )J> dGIb
* @version 1.0 1=C12
*/ 2/folTR7
public class ImprovedMergeSort implements SortUtil.Sort { U|xHy+N
h!K" ;qw
private static final int THRESHOLD = 10; n#b{
5;HGS{`
/* |[Fb&x
* (non-Javadoc) hN6wp_
* Vjv6d&Q
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) `Ucj_6&Tqs
*/ D@gC(&U/6
public void sort(int[] data) { *2->>"kh
int[] temp=new int[data.length]; * 7Ov.v%
mergeSort(data,temp,0,data.length-1); &C+2p
} XLCqB|8`V
CYgokS\=,
private void mergeSort(int[] data, int[] temp, int l, int r) { >Ti%Th,
int i, j, k; J(d[05x0
int mid = (l + r) / 2; Ih|4ISI
if (l == r) [)s4:V
return; 5rB>)p05[
if ((mid - l) >= THRESHOLD) k}H7bZug
mergeSort(data, temp, l, mid); T?m@`"L,
else n19A>,m
insertSort(data, l, mid - l + 1); U\H[.qY-
if ((r - mid) > THRESHOLD) ].kj-,5>f
mergeSort(data, temp, mid + 1, r); O5-GrR^yt
else U(y8nI]
insertSort(data, mid + 1, r - mid); W j^@Zq#
_$c o Y
for (i = l; i <= mid; i++) { .,xyE--;d
temp = data; sV,Yz3E<u$
} 1L4-;HYJm
for (j = 1; j <= r - mid; j++) { UWC4PWL,>C
temp[r - j + 1] = data[j + mid]; YR-G:-(#b
} h`\$8oV
int a = temp[l]; UHvA43
int b = temp[r]; lWj*tnnn[
for (i = l, j = r, k = l; k <= r; k++) { $&Vba@v
if (a < b) { ZH;4e<gg
data[k] = temp[i++]; MWA,3I\.
a = temp; sIf]e'@AC
} else { Z/G#3-5)p
data[k] = temp[j--]; mz6]=]1w
b = temp[j]; RVttk )Ny
} TG$#aX\'
} >"bW'
} iSezrN
GkI'.
/** XdCP!iq*8
* @param data E#:!&{O
* @param l =EFh*sp
* @param i _MTZuhY
*/ L7buY(F(
private void insertSort(int[] data, int start, int len) { 6CHb\k
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); 0H>gMXWE]
} zu{K"7Bx
} p4f9v:b[
} 7Qd$@ m
} xH:L6K/c
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堆排序： ~9FL]qo
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package org.rut.util.algorithm.support; ub~ t}
^.8~}TT-U
import org.rut.util.algorithm.SortUtil; A1+:y,wXs
A(E}2iP9=
/** 3{?X>6T
* @author treeroot s2SV
* @since 2006-2-2 y4h =e~
* @version 1.0 $rcv@-l
*/ ;K\2/"$QD
public class HeapSort implements SortUtil.Sort{ }WIkNG4{Z
E,.PT^au
/* (non-Javadoc) uM1$3<
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) SXqB<j$.;
*/ /i>n1>~yn
public void sort(int[] data) { ]-X6Cl
MaxHeap h=new MaxHeap(); D tZ?sG
h.init(data); @a@}xgn{
for(int i=0;i h.remove(); _xCYh|DlQ|
System.arraycopy(h.queue,1,data,0,data.length); aq_K,li#w
} }p*|8$#x"
x6R M)rr
private static class MaxHeap{ E8r6P:5d`
N Nk
void init(int[] data){ u:|^L]{
this.queue=new int[data.length+1]; qH4|k2Lm
for(int i=0;i queue[++size]=data; g&y (-
fixUp(size); <A Hzs
} R;Dj70g
} ;LP3
Wjl2S+Cc
private int size=0; n46!H0mJ
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private int[] queue; <L4$f(2
3S+9LOrhY
public int get() { PF/K&&9}
return queue[1]; #)~u YQ
} 63l& ihj
f4P({V
public void remove() { ^zV_vB)n
SortUtil.swap(queue,1,size--); C\5G43`
fixDown(1); QyVAs;
} )S+fc=
file://fixdown vx($o9
private void fixDown(int k) { XjL3Ar*
int j; yYJ_;Va
while ((j = k << 1) <= size) { M;y*`<x
if (j < size %26amp;%26amp; queue[j] j++; I m I$~q'
if (queue[k]>queue[j]) file://不用交换 a r8iuwfZ
break; gyAJ#N|
SortUtil.swap(queue,j,k); [G$#jUt/O
k = j; Rmmu#-{Y
} \O "`o4
} kHhp;<
private void fixUp(int k) { RVm-0[m}
while (k > 1) { o 7kg.w|
int j = k >> 1; #&kj>
if (queue[j]>queue[k]) /J-'[Mc'D[
break; xkRMg2X.>9
SortUtil.swap(queue,j,k); kqih`E9P7B
k = j; Skci;4T(
} 1}la)lC
} k^;n$r"i5
wO%lM
} xSD*e 0
M;<!C%K>
} J$yq#LBbR@
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SortUtil： Nf!N;Cy?
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package org.rut.util.algorithm; kQbZ!yl>[
}ZVond$y4
import org.rut.util.algorithm.support.BubbleSort; b)'CP Cu*
import org.rut.util.algorithm.support.HeapSort; _N|%i J5
import org.rut.util.algorithm.support.ImprovedMergeSort; ,==_u
import org.rut.util.algorithm.support.ImprovedQuickSort; v}u]tl$,
import org.rut.util.algorithm.support.InsertSort; =>5Lp
import org.rut.util.algorithm.support.MergeSort; BM?!?
import org.rut.util.algorithm.support.QuickSort; kE<CuO
import org.rut.util.algorithm.support.SelectionSort; l,h`YIy
import org.rut.util.algorithm.support.ShellSort; W>a}g[Ad
YRVh[Bqg`
/** KJQ8Yhq
* @author treeroot N,qo/At}R[
* @since 2006-2-2 +7w5m
* @version 1.0 rZdOU?U
*/ Jyg1z,B <
public class SortUtil { ?SgFD4<~P
public final static int INSERT = 1; aXj UDu7
public final static int BUBBLE = 2; AVDhgJv
public final static int SELECTION = 3; M^oL.'
public final static int SHELL = 4; xP'0a
public final static int QUICK = 5; Ty&1R?
public final static int IMPROVED_QUICK = 6; YSGE@
public final static int MERGE = 7; :5/Ue,~ag
public final static int IMPROVED_MERGE = 8; EF:ec9 .
public final static int HEAP = 9; dlfjx
5&Yt=)c\
public static void sort(int[] data) { zs]ubJC@
sort(data, IMPROVED_QUICK); >&;J/ME
} ]'Eg2(wy
private static String[] name={ $,by!w'e:l
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" D%o(HS\E
}; x+4K,r;
|x1OWm1:<
private static Sort[] impl=new Sort[]{ G@ot^n3
new InsertSort(), UZs '[pm)
new BubbleSort(), Jkj7ty.J
new SelectionSort(), kl:/PM^
new ShellSort(), Ywhhs }f
new QuickSort(), qX\85dPn@}
new ImprovedQuickSort(), -(TC'
new MergeSort(), .TA)|df ^
new ImprovedMergeSort(), El9T>!Z
new HeapSort() 5r 4~vK
}; 7I w^
#sCR}
public static String toString(int algorithm){ ?P[:,0_
return name[algorithm-1]; q-Z<.GTq
} m]U
KdozB!\
public static void sort(int[] data, int algorithm) { aPxSC>p
impl[algorithm-1].sort(data); 9~Sa7P
} C2rG3X^~Jm
S\N l|U[
public static interface Sort { " J9
public void sort(int[] data); 5fk A?Ecqq
} 3HtM<su*h
wwdmz;0S
public static void swap(int[] data, int i, int j) { P<R^eLZ<&
int temp = data; DI8I'c-P
data = data[j]; Wtu-g**KN
data[j] = temp; >mA]2gV<a
} Y<W9LF
} iSf%N>y'K