[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; $/^DY&
} ~?i;~S
int i1=l; 7pH`"$
int i2=mid+1; KPO?eeT.WZ
for(int cur=l;cur<=r;cur++){ ZYDLl8
if(i1==mid+1) sUA==k
data[cur]=temp[i2++]; 9a}rE
else if(i2>r) <?UbzT7X
data[cur]=temp[i1++]; j}R!'m(P'
else if(temp[i1] data[cur]=temp[i1++]; "]h4L
else ` b a}6D
data[cur]=temp[i2++]; |@#37
} _)s<E9t2N
} fa7Z=:aG
P__JN\{9
} 8q9HQ4dsL
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改进后的归并排序: x_Zi^]
NH&/=
package org.rut.util.algorithm.support; -U/"eVM
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import org.rut.util.algorithm.SortUtil; PqV9k,5f
V|GH4DT=
/** /RD@ [ 8
* @author treeroot Fm}#KE0
* @since 2006-2-2 LV|ZZ.d h
* @version 1.0 faQ}J%a
*/ qgREkb0
public class ImprovedMergeSort implements SortUtil.Sort { XFpII45
)yvI {
private static final int THRESHOLD = 10; c'M#va
k L\;90
/* u!I Es
* (non-Javadoc) sXHrCU
* T"7Ue
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) tPu0r],`o
*/ (iub\`
public void sort(int[] data) { ?+#|h;M8
int[] temp=new int[data.length]; a@(4X/|
mergeSort(data,temp,0,data.length-1); z}I=:
} $:IOoS|e
Ip#BR!$n
private void mergeSort(int[] data, int[] temp, int l, int r) { xs+pCK|
int i, j, k; 0/{$5gy&
int mid = (l + r) / 2; $="t7C9S
if (l == r) ~2 L{m[s|
return; `4^-@}
if ((mid - l) >= THRESHOLD) J2A+x\{<
mergeSort(data, temp, l, mid); B#RBR<MFC
else #OlU|I
insertSort(data, l, mid - l + 1); hx|Cam"
if ((r - mid) > THRESHOLD) wdS4iQD
mergeSort(data, temp, mid + 1, r); b=nQi./f
else =`RogjbP
insertSort(data, mid + 1, r - mid); g<C_3ap/
1k-YeQNe
for (i = l; i <= mid; i++) { VB 53n'
temp = data; h'*>\eC6
} c@H_f
for (j = 1; j <= r - mid; j++) { ;',hwo_LBf
temp[r - j + 1] = data[j + mid]; i-1lppI
} mZGAl1`8
int a = temp[l]; 5G5P#<Vv
int b = temp[r]; zTA+s 2
for (i = l, j = r, k = l; k <= r; k++) { &'%b1CbE
if (a < b) { 'a]4]d
data[k] = temp[i++]; f#4,2Xf
a = temp; Wp2b*B=-
} else { R9=K/
data[k] = temp[j--]; 0\fV'JDOR
b = temp[j]; :[icd2JCw]
} ,w>WuRN"
} mqw5\7s?
} hf5yTs
80qSPitj
/** yX%q7ex
* @param data n-X;JYQW
* @param l [C1.*Q+l
* @param i 50MdZ;R-3
*/ z1wJ-l
private void insertSort(int[] data, int start, int len) { QuG=am?l`
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); 5/U|oZM"
} {NmpTb
} uZ[7[mK}n7
} P .I<.e
} iWCR5c=
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堆排序： w[`2t{^j
Po+I!TL'
package org.rut.util.algorithm.support; #<_gY
sK1YmB :~a
import org.rut.util.algorithm.SortUtil; oWCy%76@
4sU*UePr
/** 2hZ>bg
* @author treeroot KDx~^OO
* @since 2006-2-2 j_=A)B?
* @version 1.0 B 4s^X`?z
*/ #jY\l&E
public class HeapSort implements SortUtil.Sort{ 9 Vn
c?@WNv
/* (non-Javadoc) +rT%C&ze
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) &yu3nA:7D
*/ c eH8
public void sort(int[] data) { UNx|+
MaxHeap h=new MaxHeap(); .I~#o$6
h.init(data); ZkbaUIQ
for(int i=0;i h.remove(); Gk"o/]Sf
System.arraycopy(h.queue,1,data,0,data.length); K7G|cZ/^
} >F@qFPN]
(~C_zG
private static class MaxHeap{ c!,&]*h"k
R^_7B(
void init(int[] data){ q> ;u'3}
this.queue=new int[data.length+1]; PvmmyF
for(int i=0;i queue[++size]=data; }b$?t7Q)
fixUp(size); e_eNtVq
} @UbH;m
} #Az#dt]H
Z )Imj&;
private int size=0; |r5e#3w
kNC.^8ryz[
private int[] queue; {VBn@^'s
,`4chD
public int get() { jO` b&]0
return queue[1]; ,tt .oF|
} 5m.{ayE
N^G $:GC
public void remove() { _(#HQd,i
SortUtil.swap(queue,1,size--); <K^{36h
fixDown(1); U[4Xo&`
} ll]MBq
file://fixdown KKrLF?rc
private void fixDown(int k) { Z%h _g-C
int j; [ " n+2;
while ((j = k << 1) <= size) { +[LG>
if (j < size %26amp;%26amp; queue[j] j++; <F>^ffwGH-
if (queue[k]>queue[j]) file://不用交换 Iq76JJuCb
break; hW^*b:v{
SortUtil.swap(queue,j,k); YY!Lv:.7>
k = j; [r[IWy(}
} .f1
} o'oA.'ul
private void fixUp(int k) { (8Q0?SZN
while (k > 1) { )K=%s%3h<
int j = k >> 1; 3K8#,TK3
if (queue[j]>queue[k]) *wH.]$
break; I:~KF/q
SortUtil.swap(queue,j,k); goE \C
k = j; vbo|q[z
} $)HD`E
} %l4;-x<e
^M:Y$9r_s
} zmA]@'j
~}lYp^~:J
} ,M4G_U[
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SortUtil： Ri<7!Y?l
fX ^hO+f
package org.rut.util.algorithm; .Yw
3MmpB9l#H
import org.rut.util.algorithm.support.BubbleSort; (D\7EH\9,]
import org.rut.util.algorithm.support.HeapSort; n@TK}?\UoR
import org.rut.util.algorithm.support.ImprovedMergeSort; Su4&qY
import org.rut.util.algorithm.support.ImprovedQuickSort; Aof)WKo
import org.rut.util.algorithm.support.InsertSort; R6(sWN-
import org.rut.util.algorithm.support.MergeSort; \ F\ /<
import org.rut.util.algorithm.support.QuickSort; &:>3tFQSH
import org.rut.util.algorithm.support.SelectionSort; \?$`dA[
import org.rut.util.algorithm.support.ShellSort; ;\N)RZ
Rm&^[mv
/** Z[ NO`!<
* @author treeroot ;S&PLgZ
* @since 2006-2-2 ~pZ<VH;h
* @version 1.0 _/Sqw
*/ xj ?#]GR
public class SortUtil { p#\JKx
public final static int INSERT = 1; #Nv^F
public final static int BUBBLE = 2; kFRl+,bi~
public final static int SELECTION = 3; yt5Sy
public final static int SHELL = 4; s6DmZ^Y%
public final static int QUICK = 5; Rudj"OGO
public final static int IMPROVED_QUICK = 6; xJ$/#UdP
public final static int MERGE = 7; ; ,vGw<|o
public final static int IMPROVED_MERGE = 8; ;u(#-C2^{l
public final static int HEAP = 9; Q[vQT?J7
bp[wr
public static void sort(int[] data) { vvTQ!Aa
sort(data, IMPROVED_QUICK); X7bS{GT
} !J6;F}Pd/
private static String[] name={ (&B`vgmb
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" vcmB)P-T`O
}; /wR,P
iBM;$0Y
private static Sort[] impl=new Sort[]{ eP?=tUB!S
new InsertSort(), ir{li?kV
new BubbleSort(), 5LF&C0v
new SelectionSort(), bQvhBa?
new ShellSort(), D<QE?:#
new QuickSort(), !y$:}W?_
new ImprovedQuickSort(), CE|iu!-4
new MergeSort(), aPwUC:>`D
new ImprovedMergeSort(), t'e\Z2
new HeapSort() [ ,&O
}; Irc(5rD7
~pC\"LU`
public static String toString(int algorithm){ JK/gq}c
return name[algorithm-1]; 9n#lDL O
} ppP0W`p
R<L<kChg
public static void sort(int[] data, int algorithm) { x 8/I"!gI
impl[algorithm-1].sort(data); LmZ"_
} Y'{F^VxA/
:~{Nf-y0`1
public static interface Sort { Wik8V0(
public void sort(int[] data); W>o>Y$H
} W{is2s
}eK.\_t=
public static void swap(int[] data, int i, int j) { <k'%rz
int temp = data; uxOeD%Z>
data = data[j]; [0?W>A*h
data[j] = temp; lVYrP|#
} E*Z# fa
} }0oVIr