[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; qXtC7uNj$
} _`SDG5
int i1=l; !mK()#6
int i2=mid+1; Sd6O?&(
for(int cur=l;cur<=r;cur++){ 7Q!ksp
if(i1==mid+1) [7><^?t V
data[cur]=temp[i2++]; diXWm-ZKL
else if(i2>r) "7sv@I_j
data[cur]=temp[i1++]; :?f+*
else if(temp[i1] data[cur]=temp[i1++]; QP(d77n
else B9"d7E#wHF
data[cur]=temp[i2++]; ;.jj>1=Tnl
} R_j.k3r4d
} yM 7{v$X0
L$Z!
} Nd( I RsH(
UI=v|<'-
改进后的归并排序: _7N?R0j^9N
;I5P<7VW
package org.rut.util.algorithm.support; -+){;,
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import org.rut.util.algorithm.SortUtil; +\+j/sa
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/** p{oz}}
* @author treeroot pq0Z<b;2
* @since 2006-2-2 .+>fD0fW7Y
* @version 1.0 fmYx
*/ GpPM?
public class ImprovedMergeSort implements SortUtil.Sort { i?B<&'G
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private static final int THRESHOLD = 10; qVU<jt
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/* \:h7,[e
* (non-Javadoc) #c:@oe4v
* =H7p&DhD[
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) OR&pGoW
*/ \X %#-y
public void sort(int[] data) { Sck!w 3
int[] temp=new int[data.length]; 'R1C-U3w,
mergeSort(data,temp,0,data.length-1); kt Z~r. +
} {#+K+!SvDX
<]?71{7X
private void mergeSort(int[] data, int[] temp, int l, int r) { JRBz/ j
int i, j, k; +_ehzo97
int mid = (l + r) / 2; 12i`82>;
if (l == r) r7VBz_Q
return; Jb{g{a/
if ((mid - l) >= THRESHOLD) #_\**%,<
mergeSort(data, temp, l, mid); @mw1__?
else n%h009-5
insertSort(data, l, mid - l + 1); z~Zm1tZs
if ((r - mid) > THRESHOLD) e|C2/U-
mergeSort(data, temp, mid + 1, r); hcU^!mp
else CXn?~m&K
insertSort(data, mid + 1, r - mid); EE09 Er%\
X,@nD@
for (i = l; i <= mid; i++) { @j\;9>I/
temp = data; eAO@B
} G>^= Bm_$
for (j = 1; j <= r - mid; j++) { bh" Caz.(t
temp[r - j + 1] = data[j + mid]; .\H-?6R^
} C=;}7g
int a = temp[l]; w*'DlP<7
int b = temp[r]; gD%o0jt"
for (i = l, j = r, k = l; k <= r; k++) { .z CkB86
if (a < b) { ;xq;c\N
data[k] = temp[i++]; s j-oaWt
a = temp; =WN8><K!
} else { $o9^b Z
data[k] = temp[j--]; :hOB
b = temp[j]; y<gRl/e
} '3^_:E5y
} %dw0\:P?Q
} 8F\'?7
B$c'^ )
/** #U'}g *
* @param data H^*[TX=#[
* @param l CWZv/>,%
* @param i a@|`!<5
*/ Q$Qr)mcC
private void insertSort(int[] data, int start, int len) { :V"e+I
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); xz:
} xNY&*jI
} |1kA6/
} hRKJKQ@7
} -= c&K&
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堆排序： DM6(8df(
u<"-S63+
package org.rut.util.algorithm.support; vzAY+EEx
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import org.rut.util.algorithm.SortUtil; xxGQXW
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/** 5:+x7Ed
* @author treeroot "kt7m
* @since 2006-2-2 =H-BsX?P
* @version 1.0 /5KY6XxR
*/ 3-y2i/4}$
public class HeapSort implements SortUtil.Sort{ V 7 p{'C
rk+s[Qi~
/* (non-Javadoc) 9~ V(wG
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) (CAVOed
*/ ,o2x,I
public void sort(int[] data) { ).Z U0fV
MaxHeap h=new MaxHeap(); f U<<GK70
h.init(data); `)=sQ2P
for(int i=0;i h.remove(); fuf'r>1n
System.arraycopy(h.queue,1,data,0,data.length); Cs]\3R|D`
} J{;\TNkJ
"2!5g)iO
private static class MaxHeap{ q.hpnE~#lh
W)2k>cS
void init(int[] data){ KVC18"|f
this.queue=new int[data.length+1]; aB&a#^5CI
for(int i=0;i queue[++size]=data; )WkN34Q
fixUp(size); \= 6dF,V
} x;JC{d#
} x'i~o'
aE]RVyG@L
private int size=0; t:'^pYN:g
'eQ*?a43
private int[] queue; ;x)f;!e+
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public int get() { h^zcM_
return queue[1]; )x,-O#"A
} 5p.#nc!;y
lA,[&
public void remove() { O2Y1D`&5
SortUtil.swap(queue,1,size--); 9j5k=IXg#a
fixDown(1); Y>i Qp/k:
} _Pw5n mH c
file://fixdown R,hwn2@B
private void fixDown(int k) { gfXit$s
int j; ZB$,\|^6
while ((j = k << 1) <= size) { 6 #jpA.;
if (j < size %26amp;%26amp; queue[j] j++; cW{Bsr
if (queue[k]>queue[j]) file://不用交换 & @$D(
break; 1VXn`O?LW
SortUtil.swap(queue,j,k); ]|Iczg-
k = j; UN6nh T
} bhjJH,%_>
} r*Z p-}
private void fixUp(int k) { pr\OjpvD
while (k > 1) { 78'3&,+si
int j = k >> 1; N,ihQB5
if (queue[j]>queue[k]) Xj6?,J
break; s=&x%0f%
SortUtil.swap(queue,j,k); !M7727
k = j; Coe%R(x5
} )k6z
} r[nvgzv@
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} GZiN&}5e
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} 3jM+j_nR
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SortUtil： dEoW8 M#
' '|R$9\@
package org.rut.util.algorithm; r[&/*~xL
/:w.Zf>B9
import org.rut.util.algorithm.support.BubbleSort; O=}jg0k
import org.rut.util.algorithm.support.HeapSort; C/z0/mk
import org.rut.util.algorithm.support.ImprovedMergeSort; KupQtT<
import org.rut.util.algorithm.support.ImprovedQuickSort; D89(u.h
import org.rut.util.algorithm.support.InsertSort; I|P#|0< 2
import org.rut.util.algorithm.support.MergeSort; ;0 9~#Wop
import org.rut.util.algorithm.support.QuickSort; ftqeiZ 2
import org.rut.util.algorithm.support.SelectionSort; ]%6XE)
import org.rut.util.algorithm.support.ShellSort; <`=(Ui$fD
O&PrO+&
/** jW.IkG[|
* @author treeroot WD'[|s\
* @since 2006-2-2 m@c\<-P
* @version 1.0 /80RO:'7
*/ \ci[<CP
public class SortUtil { =(as{,j
public final static int INSERT = 1; D"s ]dQ$r
public final static int BUBBLE = 2; 68a
public final static int SELECTION = 3; `yua?n
public final static int SHELL = 4; RATW[(ZA
public final static int QUICK = 5; 8(GJz ~y
public final static int IMPROVED_QUICK = 6; }woNI
public final static int MERGE = 7; .5YW>PV
public final static int IMPROVED_MERGE = 8; {#TZFB
public final static int HEAP = 9; cY%6+uJ1
IaYy5Rw
public static void sort(int[] data) { 2u^/yl
sort(data, IMPROVED_QUICK); "D/\&1.&
} sxn^1|O;m
private static String[] name={ qa)Qf,`
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" 9d >AnTf&H
}; :LMLY<8>9
6+_qGV
private static Sort[] impl=new Sort[]{ {$qLMx';
new InsertSort(), +m1y#|08
new BubbleSort(), v^Pjvv=
new SelectionSort(), LLW\1 cxi
new ShellSort(), N:e5=;6s
new QuickSort(), 5|bc*iqU
new ImprovedQuickSort(), Q$=X ?{
new MergeSort(), H1kxY]_/
new ImprovedMergeSort(), UZ 6:vmcT
new HeapSort() Ab)X/g-I@
}; Hyz:i)2
+ Awo\;@,
public static String toString(int algorithm){ ~&T%u.u7
return name[algorithm-1]; lX|d:HFtP
} "midC(rTm
^q)s
public static void sort(int[] data, int algorithm) { l]__!X
impl[algorithm-1].sort(data); u+,
} 3Ay<2v
-|3feYb'
public static interface Sort { }E](NvCq
public void sort(int[] data); $]S*(K3U~
} 85]3y%f9
j21nh>d
public static void swap(int[] data, int i, int j) { "~ eF%}.
int temp = data; `\#J&N
data = data[j]; H.]rH,8
data[j] = temp; 4ai|*8.
} _|vY)4B4U
} <gbm 1iEe