[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; Cd)e_&
} Et~b^8$>
int i1=l; mN3}wJ}J
int i2=mid+1; h+F@apUS
for(int cur=l;cur<=r;cur++){ M$g%kqa
if(i1==mid+1) (;YO]U4
data[cur]=temp[i2++]; jq(3y|6,
else if(i2>r) fU^B 3S6X
data[cur]=temp[i1++]; ^c{}G<U^
else if(temp[i1] data[cur]=temp[i1++]; O-B~~$g
else $@d`Kz;
data[cur]=temp[i2++]; `EVTlq@<
} j-|YE?AA
} GXB4&Q!C
RL/~E xYC
} BX$t |t;!m
Y W_E,A>h
改进后的归并排序: <$Q\vCR
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package org.rut.util.algorithm.support; ])h={gI
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import org.rut.util.algorithm.SortUtil; w] LN(o:
Frn#?n)S9
/** 9PhdoREb
* @author treeroot @<Au|l`
* @since 2006-2-2 Ls#pe
* @version 1.0 i.2O~30ST
*/ ~LGkc t
public class ImprovedMergeSort implements SortUtil.Sort { ElAJR4'{*i
)%%RI_JT
private static final int THRESHOLD = 10; cAC2Xq
|Axg}Q|
/* KTxdZt
* (non-Javadoc) on(P
* , M$*c
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) SPW @TF1
*/ d_#\^!9
public void sort(int[] data) { m>2b %GTh
int[] temp=new int[data.length]; d$)'?Sf]h
mergeSort(data,temp,0,data.length-1); {n%-^9b1{&
} |o~<Ti6]
*/xI#G,O+
private void mergeSort(int[] data, int[] temp, int l, int r) { e3YZ-w^W~h
int i, j, k; VHVU*6_w
int mid = (l + r) / 2; <K:?<F
if (l == r) b6_*ljM
return; ncJ}h\:Sk
if ((mid - l) >= THRESHOLD) zNRoFz.
mergeSort(data, temp, l, mid); lqAU5K{wQ
else USu/Y29
insertSort(data, l, mid - l + 1); (FZL>
if ((r - mid) > THRESHOLD) 8h9t8?
mergeSort(data, temp, mid + 1, r); a*&P>Lwe7&
else Q_/{TE/sO5
insertSort(data, mid + 1, r - mid); *2crhI*@>
>JS\H6
for (i = l; i <= mid; i++) { {y<[1Pms
temp = data; L5%~H?K(
} >`= '~y8
for (j = 1; j <= r - mid; j++) { FOpOS?Cr'
temp[r - j + 1] = data[j + mid]; PYr#vOH
} E*IkI))X0
int a = temp[l]; Vi`+2%4
int b = temp[r]; gwQL9 UYx
for (i = l, j = r, k = l; k <= r; k++) { ,HS\(Z
if (a < b) { 1YR;dn
data[k] = temp[i++]; ^ef:cS$;
a = temp; K @"m0
} else { `m<l8'g
data[k] = temp[j--]; Cca( oV
b = temp[j]; N J:]jd
} k#`.!yI,
} O]w&uim
} W5}.WFu
jEklf0Z
/** hbR;zV|US
* @param data NI=t)[\F
* @param l <Sm -Z,|
* @param i MUz.-YRt
*/ oLk>|J
private void insertSort(int[] data, int start, int len) { a}`4BMi3
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); UY j
} JI )+
} 1Y@6oT
} \A:m<::
} B:ddlxT$
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堆排序： nXK"BYe
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package org.rut.util.algorithm.support; *gHOH!K,S
&PD4+%!
import org.rut.util.algorithm.SortUtil; IvetQ+
+Es3iE @
/** N<Rb<p%
* @author treeroot Rg<y8~|'}
* @since 2006-2-2 A)040n
* @version 1.0 GhLgV
*/ C2AP
public class HeapSort implements SortUtil.Sort{ V!c{%zd
{"y{V
/* (non-Javadoc) QV+('
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) )gvXeJ
*/ rj$u_y3S*
public void sort(int[] data) { =r+u!~%@''
MaxHeap h=new MaxHeap(); g63:WX-\
h.init(data); W2tIt&{
for(int i=0;i h.remove(); `>rdn*B
System.arraycopy(h.queue,1,data,0,data.length); RoM'+1nP:#
} Y {Klwn
+ }(
private static class MaxHeap{ z|}Anc[\
eL^,-3JA(]
void init(int[] data){ x*i5g`jx
this.queue=new int[data.length+1]; ;W?e@ Lgxk
for(int i=0;i queue[++size]=data; ex $d~
fixUp(size); &xr?yd
} )Be}Ev#)Zx
} IyOujdKa
: i3-7k
private int size=0; -}2q-
CeR4's7
private int[] queue; #E5#{bra
Vj0`*nC)/
public int get() { $b\Gl=YX^
return queue[1]; S#!PDg
} j!&g:{ e
+;`Cm.Iu
public void remove() { /QHvwaW[
SortUtil.swap(queue,1,size--); o&rejj#
fixDown(1); }pPxN@X
} Kx*;!3-V$
file://fixdown W=mh*G3y
private void fixDown(int k) { W3{k{~
int j; yXc/Nl%
while ((j = k << 1) <= size) { :2 ?dl:l
if (j < size %26amp;%26amp; queue[j] j++; $Xk1'AzB8
if (queue[k]>queue[j]) file://不用交换 )eY3[>`
break; cliP+#
SortUtil.swap(queue,j,k); n1DD+@
k = j; n0@e%=H)I
} L\nWhmwl
} tLS5yT/
private void fixUp(int k) { L2P~moVIi
while (k > 1) { ED[PP2[/
int j = k >> 1; pb$U~TvzhM
if (queue[j]>queue[k]) LEc%BQx
break; 1 W2AE?
SortUtil.swap(queue,j,k); Nk86Y2h
k = j; ?5'UrqYSW
} 3tS~/o+]
} "^zxq5u
Z)|*mJ
} E$4\Yc)(AL
h?bm1e5kE
} e}(ws~.
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SortUtil： GasIOPzK
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package org.rut.util.algorithm; b0tr)>d
;-n+=@]7
import org.rut.util.algorithm.support.BubbleSort; mxq'A
import org.rut.util.algorithm.support.HeapSort; 3Q~ng2Wv%
import org.rut.util.algorithm.support.ImprovedMergeSort; puL1A?Y8UM
import org.rut.util.algorithm.support.ImprovedQuickSort; |0B h
import org.rut.util.algorithm.support.InsertSort; 0kQAT#
import org.rut.util.algorithm.support.MergeSort; N02N w(pi
import org.rut.util.algorithm.support.QuickSort; u <%,Ql
import org.rut.util.algorithm.support.SelectionSort; d.% Vm&3
import org.rut.util.algorithm.support.ShellSort; fJd!;ur)0
!R[o6V5T
/** 6@ET3v
* @author treeroot v#(wc+[
* @since 2006-2-2 N#6&t8;kTC
* @version 1.0 2y,NT|jp
*/ mj%Iow.
public class SortUtil { )e4nKh],
public final static int INSERT = 1; n_v|fxF1
public final static int BUBBLE = 2; 9$)TAI&P
public final static int SELECTION = 3; oslrv7EK
public final static int SHELL = 4; IpB0~`7YI
public final static int QUICK = 5; |mc!v*O
public final static int IMPROVED_QUICK = 6; Y2yVl+
public final static int MERGE = 7; +[V?3Gdb
public final static int IMPROVED_MERGE = 8; xQm!
public final static int HEAP = 9; enO5XsIc
)`,3/i9C$
public static void sort(int[] data) { v /G,
sort(data, IMPROVED_QUICK); 1$q SbQ
} {E@Vh
private static String[] name={ `V$i*{c:#
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" FlrLXTx0
}; My5h;N@C
BQ)zm
private static Sort[] impl=new Sort[]{ pI( OI>~3
new InsertSort(), )4D |sN
new BubbleSort(), AHIk7[w
new SelectionSort(), yw{GO([ZQ
new ShellSort(), hJkIFyQ{j
new QuickSort(), IyL2{5
new ImprovedQuickSort(), ^bexXYh
new MergeSort(), W.HM!HQp
new ImprovedMergeSort(), ,+oQ 5c(f
new HeapSort() Hb#8?{
}; Mf<Pms\F
<FRYt-+
public static String toString(int algorithm){ bfQ+}|;
return name[algorithm-1]; WDP$w(M
} t1 OnA#]/_
*<i { Mb Q
public static void sort(int[] data, int algorithm) { vc^qpOk
impl[algorithm-1].sort(data); SYw>P1
} u1~H1 ]Ii
ss-{l+Z5
public static interface Sort { "/S-+Ufn
public void sort(int[] data); 2pQ zT
} 38tRb"3zP
dK#:io[Nz
public static void swap(int[] data, int i, int j) { HKP<=<8/O
int temp = data; xeIt7b?#
data = data[j]; 0%<Fc9#
data[j] = temp; ^}a..@|%W
} ^I5k+cL
} ol^OvG:TQ