[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; y*7ht{B
} _k j51=
int i1=l; LI nN-b#
int i2=mid+1; vys*=48g
for(int cur=l;cur<=r;cur++){ s;5PHweWf
if(i1==mid+1) JL(*peeu3
data[cur]=temp[i2++]; *dKA/.g
else if(i2>r) j,G/[V
data[cur]=temp[i1++]; YJ75dXc&&
else if(temp[i1] data[cur]=temp[i1++]; ueWG/`ig
else 7q67_u?@
data[cur]=temp[i2++]; t*D[Q$v
} &.4lhfI+(Q
} F^Q
>ueJ+sgH
} *#2`b%qh\M
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改进后的归并排序: q2hZ1o
k| jCc
package org.rut.util.algorithm.support; :+R||qi
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import org.rut.util.algorithm.SortUtil; XHe=
?>AhC{
/** ' !_44
* @author treeroot U}qW9X;o
* @since 2006-2-2 M_XZOlW5
* @version 1.0 !-;Me&"I=`
*/ h.7 1O"N
public class ImprovedMergeSort implements SortUtil.Sort { MA1,;pv6
8a05`ZdP
private static final int THRESHOLD = 10; \<PX'mnO
@D60
/* :))AZ7_
* (non-Javadoc) 3PJ
* 1DLQZq
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) H$[--_dI{
*/ WrD20Q$9Q
public void sort(int[] data) { :V_$?S
int[] temp=new int[data.length]; goHr#@
mergeSort(data,temp,0,data.length-1); }& 1_gn15
} #2WBYScW0
Az)P&*2:'`
private void mergeSort(int[] data, int[] temp, int l, int r) { <~Y4JMr"
int i, j, k; YobIbpo
int mid = (l + r) / 2; 5jsnE )
if (l == r) Q5jP`<zWU
return; =ecv;uu2
if ((mid - l) >= THRESHOLD) hrXN38-
mergeSort(data, temp, l, mid); '+}hVfN
else ?`w ~1
insertSort(data, l, mid - l + 1); `i.f4]r
if ((r - mid) > THRESHOLD) f|q6<n_nM
mergeSort(data, temp, mid + 1, r); .z{7 rH
else EG1SIEo
insertSort(data, mid + 1, r - mid); h]D=v B
:s$9#}hw,
for (i = l; i <= mid; i++) { d-?~O~qD|!
temp = data; }U#S*
} Y&j6;2-Z
for (j = 1; j <= r - mid; j++) { |RpC0I
temp[r - j + 1] = data[j + mid]; Ia(A&Za
} $h$+EE!
int a = temp[l]; (te\!$
int b = temp[r]; %WO;WxG8^
for (i = l, j = r, k = l; k <= r; k++) { =LT({8
if (a < b) { ~q1s4^J
data[k] = temp[i++]; r7IhmdA
a = temp; L~yy;)]W
} else { gZPJZN/cpz
data[k] = temp[j--]; f?{Y<M~]
b = temp[j]; ", |wG7N K
} V)0bLR
} DL~LSh
} 4$|G$h
@*_K#3
/** g`Rs;
* @param data Xpa;F$VI
* @param l ,O-lDzcw
* @param i AOfQqGf
*/ F`ihw[ Wn
private void insertSort(int[] data, int start, int len) { dyx4_!fO
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); Q \{\uJ x
} =T\pq8
} ^|x{E20
} bqe;) A7
} lLg23k{'
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堆排序： 2.NzB7c*CM
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package org.rut.util.algorithm.support; T2Vj&EA@
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import org.rut.util.algorithm.SortUtil; =-q)I[4#
=djzE`)0
/** {#;6$dU;(
* @author treeroot cX&c%~
* @since 2006-2-2 cfj6I
* @version 1.0 T&S< 0
*/ .oe,#1Qh{
public class HeapSort implements SortUtil.Sort{ +g.WO5A
c\x?k<=
/* (non-Javadoc) 2HTZ,W
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) I@z{Gr
*/ -~aVt~{k/
public void sort(int[] data) { gWlmQl
MaxHeap h=new MaxHeap(); ]ny(l#Hu:
h.init(data); t]vz+VQ
for(int i=0;i h.remove(); C )PN
System.arraycopy(h.queue,1,data,0,data.length); @vv`86bm
} UtWoSFZ'o!
AX&1-U
private static class MaxHeap{ Z@h]dU5%a
My[L3KTTp
void init(int[] data){ 3!}#@<j
this.queue=new int[data.length+1]; i$F)h<OU+
for(int i=0;i queue[++size]=data; $6J5yE
fixUp(size); '2 )d9_ w
} c^=:]^
} >?DrC/
NKMB,b
private int size=0; wHY;Y-(ZT
:*8@MjZ4
private int[] queue; 6F<L4*4U
Z$pR_dazU
public int get() { C qxP@
return queue[1]; SZ0Zi\W
} 5I<?HsK@
;m&f Vp
public void remove() { EU\1EBT^
SortUtil.swap(queue,1,size--); sn*s7v:
fixDown(1); :l7\7IT
} >!oN+8[~
file://fixdown nyDqR#t
private void fixDown(int k) { CZuxH
int j; YGNX+6Lz
while ((j = k << 1) <= size) { +I/P5OGRN
if (j < size %26amp;%26amp; queue[j] j++; {6KU.'#iF
if (queue[k]>queue[j]) file://不用交换 5i#B?+Y
break; \myj Y
SortUtil.swap(queue,j,k); N-NwGD{
k = j; )HU?7n.{
} ~\Ynih
} &B3kzs
private void fixUp(int k) { .f6_[cS;g
while (k > 1) { SGbo|Xe7:
int j = k >> 1; 3Fr}8Dy
if (queue[j]>queue[k]) PffwNj/l
break; K'71uW>
SortUtil.swap(queue,j,k); $4L=Dg
k = j; Q;Oc# u
} 8ZahpB
} {1qEN_ERx
YV2^eGr.
} 3NJ-.c@(p
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} 3$RII-}>
5= F-^
SortUtil： u}$U|Cw-;T
p;B +g X
package org.rut.util.algorithm; Y /wvn8~C
jRBx7|ON
import org.rut.util.algorithm.support.BubbleSort; (*2"dd
import org.rut.util.algorithm.support.HeapSort; x~(Ul\EX
import org.rut.util.algorithm.support.ImprovedMergeSort; 8m9G^s`[
import org.rut.util.algorithm.support.ImprovedQuickSort; +wio:==
import org.rut.util.algorithm.support.InsertSort; ?Z.YJXoKZ
import org.rut.util.algorithm.support.MergeSort; JlH|=nIaj6
import org.rut.util.algorithm.support.QuickSort; XM)|v|
import org.rut.util.algorithm.support.SelectionSort; fW\u*dMMZE
import org.rut.util.algorithm.support.ShellSort; 'DIE#l`
85X^T]zo
/** 5 )C~L]
* @author treeroot TS%cTh'ItH
* @since 2006-2-2 hgh1G7A&
* @version 1.0 0zfrx-'zN
*/ 8G@FX $$Q
public class SortUtil { 1k hwwoo
public final static int INSERT = 1; _\1(7?0D
public final static int BUBBLE = 2; mki=.l$O
public final static int SELECTION = 3; !O.B,
public final static int SHELL = 4; Q/+a{m0f
public final static int QUICK = 5; w"Z>F]YZ
public final static int IMPROVED_QUICK = 6; Uligr_c?
public final static int MERGE = 7; pu^1s#g8w
public final static int IMPROVED_MERGE = 8; &iSQ2a!l8b
public final static int HEAP = 9; Mu:H'$"'H
C=Zuy^
public static void sort(int[] data) { `q/y|/v<
sort(data, IMPROVED_QUICK); im?nR+t+X
} g)"6|Z?D"
private static String[] name={ ,cB`j7p(
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" }cf-r>WaR
}; >0m-S :lk
.)o5o7H
private static Sort[] impl=new Sort[]{ 'IgtBd|K>
new InsertSort(), a@X'oV`(2b
new BubbleSort(), Kzmgy14o
new SelectionSort(), X31kHK5F_
new ShellSort(), "y`?KY$[N
new QuickSort(), x0#+yP
new ImprovedQuickSort(), o]FQ)WRB
new MergeSort(), 'z\F-Ttq
new ImprovedMergeSort(), xq]&XlA:ug
new HeapSort() 0r@rXwz
}; G cbal:q
Zaj<*?\
public static String toString(int algorithm){ :Rq D0>1
return name[algorithm-1]; *R:nB)(6<
} 5|/vc*m_0'
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public static void sort(int[] data, int algorithm) { nQgn^z#
impl[algorithm-1].sort(data); D +oo5
} Z86[sQBg
n1LS*-@
public static interface Sort { %GIla*
public void sort(int[] data); N Lo>"<Xb
} Z,2uN!6
(thzWr6;
public static void swap(int[] data, int i, int j) { gi`ZFq@
int temp = data; +I')>6
data = data[j]; U_J|{*4S.!
data[j] = temp; OO@$jXZB
} _6|b0*jv'&
} /q^( uWu