[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; uf&myV7
} +\F'iAs@
int i1=l; A^)?Wt%*
int i2=mid+1; 4cl\^yD
for(int cur=l;cur<=r;cur++){ A29gz:F(
if(i1==mid+1) |j#C|V%kV
data[cur]=temp[i2++]; 1 D<_N
else if(i2>r) J"=vE=
data[cur]=temp[i1++]; ^yyC [Mz
else if(temp[i1] data[cur]=temp[i1++]; wtH? [>S;)
else (2:/8\_P
data[cur]=temp[i2++]; UN]f"k&
} /.Ww6a~
} r[lF<2&*R
Y#u}tE d
} %<an9WMF
*Df,Ijh$
改进后的归并排序: \E%'Y
E ,|xJjh
package org.rut.util.algorithm.support; dIRm q+d^
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import org.rut.util.algorithm.SortUtil; 4KH45|;3
5[* qi?w=
/** _Jme!Oaa
* @author treeroot }Rz3<eON
* @since 2006-2-2 eC[$B99\
* @version 1.0 kH]yl 2
*/ fO0XA"=
public class ImprovedMergeSort implements SortUtil.Sort { +eFFSt
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private static final int THRESHOLD = 10; n~A%q,DmF
^OstR`U3
/* K)Q]a30
* (non-Javadoc) <xgTS[k
* PzA|t;*
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) DjN|Wr)*
*/ ;K!]4tfJ
public void sort(int[] data) { X_$Cb<e
int[] temp=new int[data.length]; +YqZ((
mergeSort(data,temp,0,data.length-1); $CY't'6Hn
} -5I2ga
&8]d }-e
private void mergeSort(int[] data, int[] temp, int l, int r) { X!m9lV<
int i, j, k; 20Z8HwQi
int mid = (l + r) / 2; \9/ b!A
if (l == r) Lz:(6`S
return; { Fawt:
if ((mid - l) >= THRESHOLD) ,)iKH]lY=
mergeSort(data, temp, l, mid); $aN&nhoO<
else \>7^f 3m
insertSort(data, l, mid - l + 1); {|1Y:&M?
if ((r - mid) > THRESHOLD) .8y3O]
mergeSort(data, temp, mid + 1, r); F@<CsgKB-
else ad:&$
insertSort(data, mid + 1, r - mid); h\PHKC2
J,AR5@)1
for (i = l; i <= mid; i++) { _c,'>aH=
temp = data; +=.W<b
} `.x Fiyc
for (j = 1; j <= r - mid; j++) { A@sZ14+f
temp[r - j + 1] = data[j + mid]; |m80]@>
} XI9js{p
int a = temp[l]; uwjGDw
int b = temp[r]; `kU/NKq
for (i = l, j = r, k = l; k <= r; k++) { \U[{z&]~
if (a < b) { =9"W@n[>W
data[k] = temp[i++]; IaT$6\>
a = temp; sfOHarww
} else { D;_ MPN[
data[k] = temp[j--]; G=A,9@+c
b = temp[j]; aEWWFN
} 4(1(e
} ;~\MZYs3m
} [&nh5|f
DBCK2PlJ
/** Sp^9&^
* @param data t| 'N+-T3
* @param l `$B3X
* @param i :@!ic<p
*/ l?Fb ='#
private void insertSort(int[] data, int start, int len) { @)-$kk*
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); y^}6!>Ou:
} ^8@Iyh
} |'{zri|A"
} aMvI?y {
} 7 <Q5;J&;
)I$q5%q8
堆排序： W~p/,HcM
ijdXU8
package org.rut.util.algorithm.support; HfvTxaK
e`v`XSA[p
import org.rut.util.algorithm.SortUtil; @$2))g`
%o:2^5\W
/** I<8sI%,s
* @author treeroot %LZ({\5K#f
* @since 2006-2-2 a\:VREKj,
* @version 1.0 kJ-*fe'S
*/ aBw2f[mo
public class HeapSort implements SortUtil.Sort{ * C6a?]
i![dPM
/* (non-Javadoc) [g Z"a*
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ty*@7g0k
*/ }-o{ASC#
public void sort(int[] data) { y:h}z).
MaxHeap h=new MaxHeap(); vJU*>U,
h.init(data); 6^c>,.R
for(int i=0;i h.remove(); ^+m+zd_
System.arraycopy(h.queue,1,data,0,data.length); i6 (a@KRY
} ZU9c 5/J
OKvPL=~
private static class MaxHeap{ S:x?6IDPC^
V]vc(rH
void init(int[] data){ F`9ZH.
this.queue=new int[data.length+1]; jvV9eA:zl
for(int i=0;i queue[++size]=data; zKsz*xv6b
fixUp(size); v!FMs<
} {s_+?<l
} 8-Hsgf.*
)"m!YuSY
private int size=0; l$jxLZ
m~D&gGFt
private int[] queue; nYt/U\n!
a /:@"&Y
public int get() { bgK<pi)d
return queue[1]; |-CnT:|o
} "/nNM{^
!E-Pa5s
public void remove() { 3^Q]j^e4Ny
SortUtil.swap(queue,1,size--); ^+1#[E
fixDown(1); Q26qNn bK
} LT,?$I
file://fixdown F1Hh7 F
private void fixDown(int k) { N?m0USu*
int j; if]Noe
while ((j = k << 1) <= size) { PT5AA8F
if (j < size %26amp;%26amp; queue[j] j++; 60)iw4<wf
if (queue[k]>queue[j]) file://不用交换 =Mb1o[
break; (}5S
SortUtil.swap(queue,j,k); h#hxOVl%x
k = j; 5 XA=G
} I6s3+x;O
} |/|
private void fixUp(int k) { 7oR:1DXw|
while (k > 1) { ) 9oH,gZ
int j = k >> 1; )#}mH@
if (queue[j]>queue[k]) KPpHwcYxT
break; G5,~Z&}YS
SortUtil.swap(queue,j,k); )|I5j];L
k = j; wfP5@!I
} "sKa`WN}
} <uc1D/~^:
2EK%N'H
} $ A9%UhV
f(eQ+0D
} pMJ1v
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SortUtil： \G2B?>E;
P@]8pIB0d^
package org.rut.util.algorithm; wCHR7X0*b
033T>qY
import org.rut.util.algorithm.support.BubbleSort; Jy aag-
import org.rut.util.algorithm.support.HeapSort; x+@&(NMP5
import org.rut.util.algorithm.support.ImprovedMergeSort; `+/H^
import org.rut.util.algorithm.support.ImprovedQuickSort; wO>L#"X^v
import org.rut.util.algorithm.support.InsertSort; :SsUdIX;P
import org.rut.util.algorithm.support.MergeSort; 7E@+
import org.rut.util.algorithm.support.QuickSort; 4A3nO<oMF
import org.rut.util.algorithm.support.SelectionSort; kpI{KISQu
import org.rut.util.algorithm.support.ShellSort; \M"UmSB o
4W#E`9 6u
/** D)brPMS:o
* @author treeroot m"9XT)N
* @since 2006-2-2 WpLZQ6wH
* @version 1.0 [,aqQ6S
*/ JNFIT;L
public class SortUtil { 1,V`8 [
public final static int INSERT = 1; S',9g4(5
public final static int BUBBLE = 2; K"V:<a
public final static int SELECTION = 3; aRc'
public final static int SHELL = 4; }N*>QR5K
public final static int QUICK = 5; L@^~N$G&u
public final static int IMPROVED_QUICK = 6; =ORf%f5"'
public final static int MERGE = 7; "|m|E/Z-9
public final static int IMPROVED_MERGE = 8; ZCg`z
public final static int HEAP = 9; o_Si mJFK
?K@t0a
public static void sort(int[] data) { I=Oy-
sort(data, IMPROVED_QUICK); poJg"R4
} 1KYN>s:
private static String[] name={ a?R[J==
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" Q8MS,7y/
}; m4[g6pNx~
?'r9"M>
private static Sort[] impl=new Sort[]{ 'lS`s(
new InsertSort(), ntP|\E
new BubbleSort(), -~4+w
new SelectionSort(), SjdZyJa
new ShellSort(), F.)!3YE
new QuickSort(), d3]hyTqbtm
new ImprovedQuickSort(), 4q$H
new MergeSort(), ]/T-t1D
new ImprovedMergeSort(), XW L^
new HeapSort() SLhEc
}; !Do,>gO
B/"2.,
public static String toString(int algorithm){ _iEj
return name[algorithm-1]; gq5qRi`q
} @+_&Y]
y)F!c29
public static void sort(int[] data, int algorithm) { = c~I .
impl[algorithm-1].sort(data); o;[bJ Z\^x
} [k]|Qink
nVD Xj
public static interface Sort { Yn9j-`
public void sort(int[] data); A.Bk/N1G
} IwpbfZ
Qeb}!k2A
public static void swap(int[] data, int i, int j) { $gMCR b,
int temp = data; %So]3;'
data = data[j]; P=H+ #
data[j] = temp; o7+>G~i
} jK8'T_Pah
} P.sgRsL