[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; )>p6h]]a
} h]P$L>
int i1=l; cf!R
int i2=mid+1; itvdzPO
for(int cur=l;cur<=r;cur++){ iKY&gnu"
if(i1==mid+1) wv-8\)oA
data[cur]=temp[i2++]; `<d>C}9
else if(i2>r) Pme?`YO$x
data[cur]=temp[i1++]; i-b7
else if(temp[i1] data[cur]=temp[i1++]; N\$wpDI~
else =T]OYk
data[cur]=temp[i2++]; p<e~x/@m*
} Efl+`6`J
} lR!$+atW
a=dN.OB}F7
} [4e5(!e
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改进后的归并排序: "Wp<^ssMo
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package org.rut.util.algorithm.support; !Ao?bs'
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import org.rut.util.algorithm.SortUtil; |z%,W/Ef
S)%x22sqf
/** DVl:s
* @author treeroot _?ZT[t<
* @since 2006-2-2 :*1w;>o)n
* @version 1.0 T2{+fRvN
*/ e j9G[
public class ImprovedMergeSort implements SortUtil.Sort { NL 37Y{b
j^.P=;
private static final int THRESHOLD = 10; |=POV]K
(Wn'.|^%
/* 6_Kz}PQ
* (non-Javadoc) 1yu!:8=ee
* UL/>t}AG
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) heWb(E&
*/ DYS(ZY)4
public void sort(int[] data) { >@"j9
int[] temp=new int[data.length]; Gu=Rf`o
mergeSort(data,temp,0,data.length-1); qU}DOL|
} LjH];=R
P*SXfb"HC
private void mergeSort(int[] data, int[] temp, int l, int r) { kBzzi^cl
int i, j, k; o;.-I[9h]
int mid = (l + r) / 2; u2t<auE9^
if (l == r) ?P5D!b:(
return; D1f=f88/}
if ((mid - l) >= THRESHOLD) md0=6< }P
mergeSort(data, temp, l, mid); B:4u2/!5
else HZT;7<
insertSort(data, l, mid - l + 1); -cKR15
if ((r - mid) > THRESHOLD) ",}VB8K
mergeSort(data, temp, mid + 1, r); %_ ~[+~#
else t]x HM
insertSort(data, mid + 1, r - mid); CqoL5qt
$3L7R
for (i = l; i <= mid; i++) { MWl@smRh
temp = data; 4Qdg t*
} [V2l&ZUni
for (j = 1; j <= r - mid; j++) { ^{s)`j'I*
temp[r - j + 1] = data[j + mid]; "rXGXQu
} i`Tne3)
int a = temp[l]; s+[=nau('w
int b = temp[r]; '/j`j>'!^
for (i = l, j = r, k = l; k <= r; k++) { 1Jahu!c?
if (a < b) { E8xXr>j>#
data[k] = temp[i++]; 7@sWT<P
a = temp; qSQjAo4t@
} else { Cpj_mMtu
data[k] = temp[j--]; C.@zVt
b = temp[j]; Dihk8qJ/6
} Cxh9rUe.
} \R<yja
} DGU$3w
;02lmpBj
/** .Ybm27Dk
* @param data r[gV`khka
* @param l B4.hJZ5
* @param i 4uz\Me(
*/ L]p:gI{m
private void insertSort(int[] data, int start, int len) { k@Hu0x
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); `mMD e
} :>,d$f^tqE
} M6e"4Gh
} H1l'\
} TqlUe@E
+@!9&5SA
堆排序： / g&mDYV|
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package org.rut.util.algorithm.support; I[&!\Me[+w
mV;7SBoT
import org.rut.util.algorithm.SortUtil; nBNZ@nD
z` sH
/** 9oaq%Sf
* @author treeroot Tv(s?T6f
* @since 2006-2-2 }x%"Oq|2]x
* @version 1.0 -<|Ebh d3
*/ o?b"B+#
public class HeapSort implements SortUtil.Sort{ i}q6^;uTF
6Fm.^9@
/* (non-Javadoc) _z}d yp"I
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ]AN)M>
*/ I\[*vgjm3G
public void sort(int[] data) { UP,(zKTA
MaxHeap h=new MaxHeap(); [*1c.&%(
h.init(data); K46mE
for(int i=0;i h.remove(); ;B7>/q;g
System.arraycopy(h.queue,1,data,0,data.length); x.d9mjLN8m
} /WM : Bj
87*R#((
private static class MaxHeap{ s&c^Wr
\+5L.Q
void init(int[] data){ #|'8O
this.queue=new int[data.length+1]; 2[WQq)\
for(int i=0;i queue[++size]=data; K[ylyQ1
fixUp(size); oVLz7Y[JE
} 0a(*/u
} {xOu*8J
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private int size=0; eqLETo@} *
ntjUnd&v\
private int[] queue; +[cm
oiklRf
public int get() { K<V(h#(.@
return queue[1]; F2XXvxG
} 0m?ul%=
-,Q<*)q{
public void remove() { t[#`%$%'
SortUtil.swap(queue,1,size--); 3lKIEPf6r
fixDown(1); $i =-A
} &jj\-;=~Ho
file://fixdown S;CT:kG6Y{
private void fixDown(int k) { ,,@_r&f:
int j; +|o-lb
while ((j = k << 1) <= size) { 0wOgQ n
if (j < size %26amp;%26amp; queue[j] j++; dso\+s
if (queue[k]>queue[j]) file://不用交换 zO!`sPP
break; A]R"C:o
SortUtil.swap(queue,j,k); BL]^+KnP
k = j; S?D2`b
} ^%\p; yhL
} RI%*5lM8;
private void fixUp(int k) { P~?u2,.E[
while (k > 1) { /Fk0j_b
int j = k >> 1; 'W$qi@f_s
if (queue[j]>queue[k]) (L~3nN;rr
break; NeNKOW#X
SortUtil.swap(queue,j,k); 2*Gl|@~N
k = j; (spX3n%p
} XLM 9+L
} S:DB%V3
0`OqD d
} 4}8Xoywi1
@UvjJ
} $bD!./fl
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SortUtil： !WbQ`]uN/#
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package org.rut.util.algorithm; r"rEVx#1=
,E/vHI8
import org.rut.util.algorithm.support.BubbleSort; !&#CEF@J
import org.rut.util.algorithm.support.HeapSort; xv1$,|^ts
import org.rut.util.algorithm.support.ImprovedMergeSort; $'e.bh
import org.rut.util.algorithm.support.ImprovedQuickSort; QO|ODW+D
import org.rut.util.algorithm.support.InsertSort; ujwI4oj"c
import org.rut.util.algorithm.support.MergeSort; "ebn0<cZ
import org.rut.util.algorithm.support.QuickSort; F.AO
import org.rut.util.algorithm.support.SelectionSort; B[y1RI|9
import org.rut.util.algorithm.support.ShellSort; K5k,47"
/oWB7l&
/** p-ry{"XA
* @author treeroot ]QpR>b=[j
* @since 2006-2-2 :?lSa6de
* @version 1.0 Wlt shZo
*/ F=#zy#@.
public class SortUtil { #`?uV)(
public final static int INSERT = 1; Xf#uK\f
public final static int BUBBLE = 2; i3f/{D/
public final static int SELECTION = 3; J,jl(=G
public final static int SHELL = 4; S$V'_
public final static int QUICK = 5; -[+FVvS
public final static int IMPROVED_QUICK = 6; eYS
public final static int MERGE = 7; O:D`6U+0
public final static int IMPROVED_MERGE = 8; ~PS%^zxyn
public final static int HEAP = 9; f *)t<1f
w/ZV9"BhE
public static void sort(int[] data) { mQ1QJ_;
sort(data, IMPROVED_QUICK); >a^H7kp
} M~3(4,
private static String[] name={ ]>x674H
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" '\ 6.GP
}; hj9bMj
eeuAo&L&
private static Sort[] impl=new Sort[]{ G.cs-f
new InsertSort(), X~W5Z(w(O
new BubbleSort(), nEs l
new SelectionSort(), g,x$z~zU{
new ShellSort(), w6Ue5Ix,!
new QuickSort(), g[!sGa&
new ImprovedQuickSort(), '?Hy"5gUA
new MergeSort(), M}us^t*
new ImprovedMergeSort(), qOkw6jfluh
new HeapSort() q-p4k`]
}; >Utn[']~
D|UDLaz~
public static String toString(int algorithm){ <:/V`b3a
return name[algorithm-1]; Ip?Ueaei
} <o p !dS
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public static void sort(int[] data, int algorithm) { /n(0nU[
impl[algorithm-1].sort(data); n j1 cqh
} mnG\UK,k
RkC?(p
public static interface Sort { aiUn bP
public void sort(int[] data); `\#Qr|GC
} cjH ~H8
ijC;"j/(
public static void swap(int[] data, int i, int j) { OB5{EILej
int temp = data; vUJb-
data = data[j]; {:fyz#>>^
data[j] = temp; uy7)9w
} V@T G"YF
} sE]eIN