[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; `/IKdO*!S
} q|(W-h+
int i1=l; kOrl\_!z3
int i2=mid+1; !0}\&<8/m
for(int cur=l;cur<=r;cur++){ WO*9+\[v
if(i1==mid+1) B80aw>M
data[cur]=temp[i2++]; e%O0hE
else if(i2>r) ftbpqp'
data[cur]=temp[i1++]; 01@t~v3!Z
else if(temp[i1] data[cur]=temp[i1++]; 7hw .B'7
else 04@cLDX8uB
data[cur]=temp[i2++]; RHY4P4B<v>
} 5.0e~zlM-
} zGlZ!t:
T)iW`vZg8
} S4o$t-9l
=;L*<I
改进后的归并排序: uGP(R=H
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package org.rut.util.algorithm.support; zJN7<sv
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import org.rut.util.algorithm.SortUtil; xL "!~dN
=:I+6PlF@
/** ,H kj1x
* @author treeroot AC- )BM';
* @since 2006-2-2 ]0j9>s2|Z
* @version 1.0 _^ |2}t
*/ [k%4eO2p"
public class ImprovedMergeSort implements SortUtil.Sort { ,<Kx{+ [h
i@P}{
private static final int THRESHOLD = 10; jLVl4h&
S?0$?w?
/* l.=p8-/$'7
* (non-Javadoc) ,. EBOUW^
* gFN9jM
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) uaPx"
*/ lCT{v@pp
public void sort(int[] data) { /Lf6WMit
int[] temp=new int[data.length]; V"KS[>>f
mergeSort(data,temp,0,data.length-1); :#t*K6dz
} *%FA:Y
t0E51Ic@
private void mergeSort(int[] data, int[] temp, int l, int r) { 0\QR!*'$
int i, j, k; nHXX\i
int mid = (l + r) / 2; \IM4Z|NN"
if (l == r) mI1H!
return; p*3; hGp6
if ((mid - l) >= THRESHOLD) Sv[5NZn0&
mergeSort(data, temp, l, mid); PL=^}{r
else @C8DZ5)
insertSort(data, l, mid - l + 1); HLK@xKD<
if ((r - mid) > THRESHOLD) BOVPKX
mergeSort(data, temp, mid + 1, r); 9J-b6,
else Sus;(3EX
insertSort(data, mid + 1, r - mid); qL /7^)(
z?]G3$i(
for (i = l; i <= mid; i++) { -0uV z)
temp = data; Am4lEvb
} JK_OZ
for (j = 1; j <= r - mid; j++) { xyh.N)
temp[r - j + 1] = data[j + mid]; $7Jo8^RE
} L@Nu/(pB=
int a = temp[l]; LRb,VD:/Y
int b = temp[r]; 4_?7&G0(
for (i = l, j = r, k = l; k <= r; k++) { 'fd1Pj9~$
if (a < b) { {p<Zbm.
data[k] = temp[i++]; ()T[$.(
a = temp; G=9d&N
} else { a:STQk V
data[k] = temp[j--]; |AZW9
b = temp[j]; io2)1cE&f
} R!\EKH
} .p` pG3
} :Ixx<9c.
9"{W,'r&d
/** j7QX,_Q
* @param data ?uLeFD
* @param l {tP%epQ
* @param i /B3R1kNf|
*/ WN]<q`.
private void insertSort(int[] data, int start, int len) { Rqipkx
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); tfO#vw,@
} q>!L6h5]t
} i^`9syD
} V>-b`e
} ~l[ra
=3xE:
堆排序： QP@<)`1t9
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package org.rut.util.algorithm.support; *~XA'Vw!
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import org.rut.util.algorithm.SortUtil; /7c~nBU
$rB3m~c|
/** )eeN1G`rDE
* @author treeroot 3 fj
* @since 2006-2-2 p/6zEZ*
* @version 1.0 p zw8T
*/ c7uG9
public class HeapSort implements SortUtil.Sort{ QbFHfA2Ij
U\@A_ B
/* (non-Javadoc) w*7|dZk{
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ;U=q-tb
*/ $m$;v<PSe
public void sort(int[] data) { vsB*rP=
MaxHeap h=new MaxHeap(); ;i uQ?MR3
h.init(data); PG%0yv%
for(int i=0;i h.remove(); R{YzH56M
System.arraycopy(h.queue,1,data,0,data.length); `(y(w-:W1
} p&p.Q^"ok
gJN0!N'
private static class MaxHeap{ {^)70Vz>PE
Pn.bVV:
void init(int[] data){ TA18 gq
this.queue=new int[data.length+1]; 2.uA|~qH
for(int i=0;i queue[++size]=data; 1k8x%5p
fixUp(size); Pz_Oe,{.I
} /lhz],w
} }Rvm &?~O
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private int size=0; ,:n| ?7
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private int[] queue; @r^!{
q}|U4MJm
public int get() { M+>`sj
return queue[1]; Oft arD
} b]Kk2S/
6(&Y(/
public void remove() { .\Fss(Zn
SortUtil.swap(queue,1,size--); U%B(5cC
fixDown(1); 's?Ai2=#
} Nt`b;X&
file://fixdown ;#+0L$<t
private void fixDown(int k) { G#`\(NW
int j; _cH@I?B
while ((j = k << 1) <= size) { b}9[s
if (j < size %26amp;%26amp; queue[j] j++; FwAKP>6*
if (queue[k]>queue[j]) file://不用交换 \BV 0zKd
break; D0G-5}s`
SortUtil.swap(queue,j,k); eitu!=u
k = j; }ucIH@U{
} 9-1#( Y6S
} VaZn{z
private void fixUp(int k) { n`Z"rwKmNw
while (k > 1) { f'(l&/4z{
int j = k >> 1; A?!I/|E^;
if (queue[j]>queue[k]) 7Ey#u4Q
break; 4Cb9%Q0
SortUtil.swap(queue,j,k); )emOKS
k = j; P,pnga3Wu
} l3o#@sz:
} sd re#@n}
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} 8iQ[9
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} 1^J`1
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SortUtil： ^4Am %yyT
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package org.rut.util.algorithm; >RI>J.~
GyI-)BlDC
import org.rut.util.algorithm.support.BubbleSort; ~ AQp|
import org.rut.util.algorithm.support.HeapSort; 3:/'n
import org.rut.util.algorithm.support.ImprovedMergeSort; 9%)=`W
import org.rut.util.algorithm.support.ImprovedQuickSort; O09ke-lC
import org.rut.util.algorithm.support.InsertSort; ,1{Ep`
import org.rut.util.algorithm.support.MergeSort; h&@R| N
import org.rut.util.algorithm.support.QuickSort; al9.}
import org.rut.util.algorithm.support.SelectionSort; \(UKdv
import org.rut.util.algorithm.support.ShellSort; L#[]I,
Vn=qV3OE]
/** XEM'}+d
* @author treeroot <-Bx&Q
* @since 2006-2-2 `D5HC
* @version 1.0 g+8hp@a
*/ 9a$56GnW1
public class SortUtil { (WlIwKP
public final static int INSERT = 1; .S\&L-{
public final static int BUBBLE = 2; ?/*~;fM
public final static int SELECTION = 3; -C7]qbT }
public final static int SHELL = 4; th5g\h%j*
public final static int QUICK = 5; m#H3:-h,
public final static int IMPROVED_QUICK = 6; cp Ear
public final static int MERGE = 7; qAkx<u
public final static int IMPROVED_MERGE = 8; h #Z4pN8T3
public final static int HEAP = 9; 'rP]Nw
I8
public static void sort(int[] data) { u0`o A
sort(data, IMPROVED_QUICK); N6oq90G
} #1-xw~_
private static String[] name={ ~vdkFc(8B
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" W{cY6@
}; Q-TV*FD.
s Wjy6;
private static Sort[] impl=new Sort[]{ c8 K3.&P6
new InsertSort(), 3B0lb"e
new BubbleSort(), [t]X/O3<
new SelectionSort(), f2)XP$:
new ShellSort(), he3SR@\T
new QuickSort(), s=I'e/"7
new ImprovedQuickSort(), \g)Xt?w0Wo
new MergeSort(), RH;:9_*F
new ImprovedMergeSort(), a)-FGP^
new HeapSort() +0z 7KO%^^
}; d?,M/$h
0\{BWNK
public static String toString(int algorithm){ OU DcY@x~
return name[algorithm-1]; ^ ?hA@{T/1
} %%%fL;-y
uv{P,]lK
public static void sort(int[] data, int algorithm) { Jc4L5*Xn/
impl[algorithm-1].sort(data); cX!Pz.C
} or ;f&![w
JHn*->m
public static interface Sort { }]P4-KqI
public void sort(int[] data); q!'rz
} Z@D*1\TG=
X+8B!F
public static void swap(int[] data, int i, int j) { |tMn={
int temp = data; /x@RNdKv
data = data[j]; e59dVFug.U
data[j] = temp; P3tx|:gV
} G1T^a>tj4
} Q'apG)0I