[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; 2de[ yz
} Vq[L4
int i1=l; GJlkEWs
int i2=mid+1; %4X#|22n
for(int cur=l;cur<=r;cur++){ ;uw`6 KJ
if(i1==mid+1) o)w8 ]H/
data[cur]=temp[i2++]; _3_d;j#G U
else if(i2>r) rKZ1 c,y
data[cur]=temp[i1++]; Bl,rvk2
else if(temp[i1] data[cur]=temp[i1++]; Twscc"mK
else c*0pF=3
data[cur]=temp[i2++]; T(UdV]~]"
} -mD<8v[F
} f5)4H
cW+6Emh
} HEZgHL
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改进后的归并排序: $|0_[~0-n
;^QG>OP$
package org.rut.util.algorithm.support; j1{@?
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import org.rut.util.algorithm.SortUtil; OC)~psQK
"6.JpUf
/** PbR6>'
* @author treeroot X6_m&~}15
* @since 2006-2-2 UdBP2lGd
* @version 1.0 bj6-0`
*/ Ie3 F
public class ImprovedMergeSort implements SortUtil.Sort { H)XHlO^
8<cD+Jtj
private static final int THRESHOLD = 10; *eE&ptx1
K@ZK@++
/* :]?y,e%xu,
* (non-Javadoc) RRYm.dMIw
* `o7m)T')
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 8<z]rLQw?%
*/ :\ %.x3T'
public void sort(int[] data) { 6U{&`8C
int[] temp=new int[data.length]; Z#8O)GK
mergeSort(data,temp,0,data.length-1); YyI4T/0s_
} b"`Vn,
4]\f}
private void mergeSort(int[] data, int[] temp, int l, int r) { T<!&6,N A
int i, j, k; [c6I/U=-
int mid = (l + r) / 2; yc|j]?
if (l == r) eUiJl6^x
return; )ZkQWiP-
if ((mid - l) >= THRESHOLD) ["'0vQ
mergeSort(data, temp, l, mid); M,0@@:
else $@8$_g|Wz
insertSort(data, l, mid - l + 1); Ift @/A
if ((r - mid) > THRESHOLD) YXD6GJWo
mergeSort(data, temp, mid + 1, r); 3$YgGum
else caA>; +aBH
insertSort(data, mid + 1, r - mid); W'2a1E
$6p_`LD0
for (i = l; i <= mid; i++) { n0o'ns
temp = data; \k6Ho?PL
} 99T_y`df
for (j = 1; j <= r - mid; j++) { C %l!"s^
temp[r - j + 1] = data[j + mid]; KH4 5A'o
} PA5_
int a = temp[l]; O0?.$f9 s
int b = temp[r]; p h[ ^ve
for (i = l, j = r, k = l; k <= r; k++) { z"`q-R }m
if (a < b) { 3`9H
data[k] = temp[i++]; D;@*
a = temp; zu6Y*{$>g
} else { T~I5W=y
data[k] = temp[j--]; zB6u%uWR
b = temp[j]; }P[xZ_S1
} *W()|-[V3
} W_z2Fs"A
} + V:P-D
5l"EQ9
/** sP1wO4M?{
* @param data n-q
* @param l ?y( D_NtL
* @param i E\U6n""]
*/ RfP>V/jy5
private void insertSort(int[] data, int start, int len) { Vc!` BiH
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); 0Xmp)_vba
} !2dA8b
} a}N m;5K
} u!in>]^
} 79:Wo>C3-
mmC&xZ5f
堆排序： *Vk%"rwaG
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package org.rut.util.algorithm.support; Ax[!7~s
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import org.rut.util.algorithm.SortUtil; %j],6wW5J
L%,tc~)A
/** $+` YP
* @author treeroot RhM]OJd'
* @since 2006-2-2 `I$'Lp#5
* @version 1.0 =3rPE"@,[
*/ oiP8~
public class HeapSort implements SortUtil.Sort{ VV/6~jy0
lSw9e<jYO
/* (non-Javadoc) }wmn v
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 4_3O?IY
*/ /]=dPb%
public void sort(int[] data) { t7|uZHKK
MaxHeap h=new MaxHeap(); odxsF(Q0p
h.init(data); M{Ss?G4H
for(int i=0;i h.remove(); J8|F8dcz
System.arraycopy(h.queue,1,data,0,data.length); >*ey 7g
} #E`-b9Q
Z5aU7
private static class MaxHeap{ A^+G w\
ZKKz?reM'
void init(int[] data){ G{*m] 0Q
this.queue=new int[data.length+1]; bH}6N>Fp
for(int i=0;i queue[++size]=data; +^% y&8e
fixUp(size); FC.d]XA%/d
} ` aTkIo:ms
} oY@4G)5
9z9z:PU
private int size=0; >Lo 0,b$
(g2?&b iuz
private int[] queue; K5U=%z
0RY{y n3
public int get() { JZ6{W
return queue[1]; /H+br_D9
} b#p)bcz!I
B9`^JYT<
public void remove() { =|IB=
SortUtil.swap(queue,1,size--); g+8j$w}
fixDown(1); ]=v_u9;
} mx@F^
file://fixdown y=y=W5#;77
private void fixDown(int k) { ;Ab`b1B
int j; XE]YKJ?|k
while ((j = k << 1) <= size) { $Xf1|!W%a%
if (j < size %26amp;%26amp; queue[j] j++; 6x KbK1W
if (queue[k]>queue[j]) file://不用交换 srfFJX7*
break; ,<$6-3sC-
SortUtil.swap(queue,j,k); ;2"#X2B
k = j; l1^/Q~u
} t59"[kQ
} j.MpQ^eJ7
private void fixUp(int k) { 8%s^>.rG
while (k > 1) { eCB(!Y|
int j = k >> 1; a p-\R
if (queue[j]>queue[k]) 2 g"_*[
break; 910Ym!\{:
SortUtil.swap(queue,j,k); O[Xl*9P
k = j; b#0y-bR
} qM F'&
} & f7{3BK
*_d+cG
} @xR7>-$0p
)e.Y"5My
} v)@EK6Nty
frS1<+
SortUtil： <VV./W8e9
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package org.rut.util.algorithm; hNB;29r~
.$b]rx7$~
import org.rut.util.algorithm.support.BubbleSort; kYBTmz}z
import org.rut.util.algorithm.support.HeapSort; }B2H)dG^K
import org.rut.util.algorithm.support.ImprovedMergeSort; )@.bkzW
import org.rut.util.algorithm.support.ImprovedQuickSort; Tyu]14L
import org.rut.util.algorithm.support.InsertSort; 7kU:91zR
import org.rut.util.algorithm.support.MergeSort; REnd# V2x
import org.rut.util.algorithm.support.QuickSort; w)-@?jN
import org.rut.util.algorithm.support.SelectionSort; 87%t=X
import org.rut.util.algorithm.support.ShellSort; iorKS+w"
sZFIQ)b9
/** F/9]{H
* @author treeroot b_Ns Ch3@
* @since 2006-2-2 -jsNAQ
* @version 1.0 fLK*rK^{"
*/ 2V(ye9
public class SortUtil { LLv~yS O
public final static int INSERT = 1; :kSA^w8
public final static int BUBBLE = 2; D+{h@^C9Z
public final static int SELECTION = 3; ?&Si P-G
public final static int SHELL = 4; MfUG@
public final static int QUICK = 5; xkR--/f
public final static int IMPROVED_QUICK = 6; "-xm+7
public final static int MERGE = 7; r{qM!(T
public final static int IMPROVED_MERGE = 8; "~x\bSY
public final static int HEAP = 9; ]c{Zh?0
_3<J!$]&p
public static void sort(int[] data) { lbrob' '+
sort(data, IMPROVED_QUICK); \FN"0P(G
} X0 &1ICZ
private static String[] name={ u2K{3+r`'
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" ";B.^pBv@;
}; 6N(Wv0b $
{snLiCl
private static Sort[] impl=new Sort[]{ q@;WXHO0
new InsertSort(), f9H;e(D9]
new BubbleSort(), "m +Eu|{
new SelectionSort(), /b,+YyWi%
new ShellSort(), *v3/8enf
new QuickSort(), aNb=gjLpt
new ImprovedQuickSort(), M= !Fb
new MergeSort(), Mt)~:V+:
new ImprovedMergeSort(), 8'J>@ uW
new HeapSort() Wq 7 c/|
}; g#~jF
+]H9:ARI
public static String toString(int algorithm){ jPYed@[+
return name[algorithm-1]; zR h1
} fV*x2g7w
Ous[{"-J
public static void sort(int[] data, int algorithm) { s]`&9{=E
impl[algorithm-1].sort(data); \1D~4Gz6}
} %j=dKd>
d.tjLeY
public static interface Sort { p?X.I]=vRv
public void sort(int[] data); i;xH
} BZEY^G
fI[tU(x
public static void swap(int[] data, int i, int j) { YIb5jK`
int temp = data; *%(8z~(\
data = data[j]; dluNA(Xc-
data[j] = temp; T8>:@EL-k
} JC`|GaUy
} :FwXoJc_+5