[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; =qc+sMo
} hrtz>qN
int i1=l; !ig&8:
int i2=mid+1; (T0MWp0
for(int cur=l;cur<=r;cur++){ PBnH#zm
if(i1==mid+1) /ZD6pF
data[cur]=temp[i2++]; =$Mf:F@
else if(i2>r) uf90
data[cur]=temp[i1++]; GkX Se)#p
else if(temp[i1] data[cur]=temp[i1++]; ('SId@
else Qw:!Rw,x
data[cur]=temp[i2++]; E0R6qS:'
} >> "gb/x,
} pd#Sn+&rf
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} chKK9SC+|
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改进后的归并排序: -z~!%4a
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package org.rut.util.algorithm.support; iW^J>aKy
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import org.rut.util.algorithm.SortUtil; S@qR~_>a
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/** .dk<?BI#H
* @author treeroot 7Vsp<s9bj
* @since 2006-2-2 A$3Rbn}"
* @version 1.0 IO)#O<
*/ m9oOH5@K~
public class ImprovedMergeSort implements SortUtil.Sort { H:]cBk^[,
{?eUAB<
private static final int THRESHOLD = 10; <kdlXS>J.
3}<U'%sd
/* zk FX[-'O
* (non-Javadoc) N=BG0t$
* (_zlCHB
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) A vq+s.h
*/ >< $LV&
public void sort(int[] data) { WA8<:#{e
int[] temp=new int[data.length]; nFNRiDx
mergeSort(data,temp,0,data.length-1); #dj?^n g
} uy'seJ
R,G*]/r`
private void mergeSort(int[] data, int[] temp, int l, int r) { :R,M Y"(
int i, j, k; Ha`N
int mid = (l + r) / 2; nf/?7~3?[
if (l == r) b/'c h
return; Mg.%&vH\
if ((mid - l) >= THRESHOLD) N!7}B
mergeSort(data, temp, l, mid); iyl i/3|
else RkYn6
insertSort(data, l, mid - l + 1); :.,9}\LK
if ((r - mid) > THRESHOLD) 3NtUB;!
mergeSort(data, temp, mid + 1, r); cx$IWQf2
else Dz: +. @k
insertSort(data, mid + 1, r - mid); &)mZ~cPU3
>MHlrSH2
for (i = l; i <= mid; i++) { mkn1LzE|F
temp = data; x/umwT,ov
} `y3'v]
for (j = 1; j <= r - mid; j++) { :J`@@H
temp[r - j + 1] = data[j + mid]; Wr%ov6:
} f\<r1
int a = temp[l]; RJ{$`d
int b = temp[r]; ixu*@{<Z(
for (i = l, j = r, k = l; k <= r; k++) { ;Zd_2CZ
if (a < b) { N $) G8
data[k] = temp[i++]; W5 F\e[Ax5
a = temp; "Gp[.=.z?
} else { 985F(r
data[k] = temp[j--]; HE,L8S
b = temp[j]; K:a8}w>Up
} sQa;l]O:NC
} [34N/;5
} JcR|{9ghT
xmv%O&0^}
/** 4GRD- f[
* @param data Q v9q~l
* @param l =0=#M(w
* @param i q@ -B+
*/ PC_!
private void insertSort(int[] data, int start, int len) { 'w+]kt-
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); `N *:,8j
} A)&FcMO*z
} s$R /!,c
} [Cl0Kw.LD
} JpC'(N
7y'":1
堆排序： R&Y_
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package org.rut.util.algorithm.support; HY)xT$/J
ETdXk&AN
import org.rut.util.algorithm.SortUtil; EL?(D
!4vb{AH
/** Tn}`VW~
* @author treeroot 6h;(b2p{
* @since 2006-2-2 8)X9abC
* @version 1.0 c* {6T}VZr
*/ r(>S
public class HeapSort implements SortUtil.Sort{ KNx/1lf
m^D'p
/* (non-Javadoc) 5naFnm7%
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 1Z# $X`
*/ gJ6`Kl985O
public void sort(int[] data) { pLB2! +
MaxHeap h=new MaxHeap(); _uQ]I^'D
h.init(data); egaX[j r
for(int i=0;i h.remove(); =Zq6iMD
System.arraycopy(h.queue,1,data,0,data.length); JI"/,fK^
} ] 3{t}qY$A
5*YoK)2J
private static class MaxHeap{ N(&{~*YE
f^$,;
void init(int[] data){ ,9P-<P
this.queue=new int[data.length+1]; U**8^:*y#:
for(int i=0;i queue[++size]=data; .EKlw##
fixUp(size); m-AF&( ;K
} x0 )V o]r
} "I.6/9
h6h6B.\Ld
private int size=0; Ei4^__g\'
<7^|@L 6
private int[] queue; %Rk|B`ST
$Ll9ak}
public int get() { b#6S8C+@
return queue[1]; *G58t`]r
} ${ {4L?7
+U oNJ
public void remove() { o<Zlm)"%1
SortUtil.swap(queue,1,size--); | &X<-
fixDown(1); 3Vk8'
} yLa@27T\A
file://fixdown Y Zj-%5
private void fixDown(int k) { L`+[mX&2B
int j; s6 yvq#:
while ((j = k << 1) <= size) { T2e-RR
if (j < size %26amp;%26amp; queue[j] j++; ^Oz~T|)
if (queue[k]>queue[j]) file://不用交换 ?xj8a3F
break; >fBPVu\PA
SortUtil.swap(queue,j,k); OIblBQ!
k = j; Lw>B:3e
} [6!k:-t+
} }t)+eSUA
private void fixUp(int k) { jx}&%p X
while (k > 1) { P<]U
int j = k >> 1; \o>-L\`O
if (queue[j]>queue[k]) C]ss'
break; gu k,GF9p]
SortUtil.swap(queue,j,k); 5|H;%T3_
k = j; ,!:c6F+
} \*$^}8
} >]h{[kU %4
51k}LH
} d0aXA+S%
Qte5E}V`
} =g#PP@X]D!
hG1$YE
SortUtil： *rq*li;
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package org.rut.util.algorithm; z$1RD)TQB
fbq$:Q44
import org.rut.util.algorithm.support.BubbleSort; ziM{2Fs>
import org.rut.util.algorithm.support.HeapSort; 6<&A}pp
import org.rut.util.algorithm.support.ImprovedMergeSort; J6Ilg@}\
import org.rut.util.algorithm.support.ImprovedQuickSort; 'LYDJ~
import org.rut.util.algorithm.support.InsertSort; 2/?Zp=|j\
import org.rut.util.algorithm.support.MergeSort; C[^VM$
import org.rut.util.algorithm.support.QuickSort; uN%Cc12
import org.rut.util.algorithm.support.SelectionSort; vpu#!(N
import org.rut.util.algorithm.support.ShellSort; Ik:G5m<ta
`cGks
/** ' @!&{N
* @author treeroot G@7^M}
* @since 2006-2-2 4:V +>Jt
* @version 1.0 Jq_\r'YE
*/ S@,/$L
public class SortUtil { )PN8HJAArh
public final static int INSERT = 1; K?l|1jez(#
public final static int BUBBLE = 2; gfL:SP8
public final static int SELECTION = 3; ('z=/"(l
public final static int SHELL = 4; 5U?O1}P
public final static int QUICK = 5; QV[&2&&^<<
public final static int IMPROVED_QUICK = 6; |O8e;v72g^
public final static int MERGE = 7; 0LQRQuh1
public final static int IMPROVED_MERGE = 8; #}~tTL
public final static int HEAP = 9; 9wL2NC31Q
7ZUN;mr
public static void sort(int[] data) { 0F$|`v"0
sort(data, IMPROVED_QUICK); | R,dsBd
} PF4[;ES'
private static String[] name={ )q$[uS_1[
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" 4phCn5
}; 0AnL]`"t.3
cj>@Jx}]M
private static Sort[] impl=new Sort[]{ sUF$eVAT
new InsertSort(), h[(YH ;Y
new BubbleSort(), ^A ]4
new SelectionSort(), IjhRSrCv
new ShellSort(), AH,?B*zGj
new QuickSort(), K'&,]r#
new ImprovedQuickSort(), fN9{@)2Mz
new MergeSort(), !WyJ@pFU^
new ImprovedMergeSort(), r6S
new HeapSort() TXB!Y!RG#
}; Z_ElLY
\%r#>8c8
public static String toString(int algorithm){ r'i99~
return name[algorithm-1]; Rxy|Ag/I;V
} kH 9k<{
$ DN.
public static void sort(int[] data, int algorithm) { U`*we43
impl[algorithm-1].sort(data); _kD5pC =
} lg|6~=aQ
h#zm+([B*
public static interface Sort { i}T*| P
public void sort(int[] data); xbiprhdv
} ?"b __(3
wGO-Z']i
public static void swap(int[] data, int i, int j) { H;=yR]E
int temp = data; Yyk~!G/@
data = data[j]; sD3Ts;k
data[j] = temp; 3n2^;b/]
} Q}&'1J
} RrLiH>