[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; FeO1%#2<y
} (#O"
int i1=l; bqA`oRb\
int i2=mid+1; VmQ'
for(int cur=l;cur<=r;cur++){ mEi(DW)(
if(i1==mid+1) &=n/h5e0t&
data[cur]=temp[i2++]; %xQ'i4`
else if(i2>r) Sf.OBU1rs
data[cur]=temp[i1++]; "Y^9g/
else if(temp[i1] data[cur]=temp[i1++]; dPf7o
else 7[mfI?*m
data[cur]=temp[i2++]; 2cIKph
} 5kQ@]n:<k
} >G%oWRk
/^\E:(RH
} nTwJR
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改进后的归并排序: J` gG`?
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package org.rut.util.algorithm.support; [{GN#W|AGP
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import org.rut.util.algorithm.SortUtil; GRkN0|ovfj
f_xvXf:
/** 9Oq(` 4
* @author treeroot |K{d5\_
* @since 2006-2-2 c?. i;4yh
* @version 1.0 5~jz| T}s
*/ U] GD6q
public class ImprovedMergeSort implements SortUtil.Sort { 4pQf*l8e
n=F rv*"Z
private static final int THRESHOLD = 10; Mlo,F1'?>
Xy!NBh7I
/* V.qH&FJ=l
* (non-Javadoc) p=E#!cn3
* P2aFn=f
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) k0ai#3iJ
*/ @n.n[zb\|
public void sort(int[] data) { i|AWaG)
int[] temp=new int[data.length]; Aaq%'07ihW
mergeSort(data,temp,0,data.length-1); I=<Qpd4
} i '*!c
n^hkH1vY
private void mergeSort(int[] data, int[] temp, int l, int r) { ~"J1@<
int i, j, k; e`LkCy[_
int mid = (l + r) / 2; vxC];nCC#
if (l == r) 4Otq3s34FT
return; GQhy4ji'z
if ((mid - l) >= THRESHOLD) T`Up%5Dk
mergeSort(data, temp, l, mid); BN%cX2j
else %*npLDi
insertSort(data, l, mid - l + 1); p}pd&ut1
if ((r - mid) > THRESHOLD) wuYak"KX
mergeSort(data, temp, mid + 1, r); &QW&K
else _6r[msH"
insertSort(data, mid + 1, r - mid); 9s[
0!ZaR6
for (i = l; i <= mid; i++) { `O0Qtq.
temp = data; c^pQitPv
} "Ueq
for (j = 1; j <= r - mid; j++) { 9*K-d'm
temp[r - j + 1] = data[j + mid]; a@|H6:|
} ob2_=hQnC
int a = temp[l]; 6D2ot&5WW
int b = temp[r]; TlkhI
for (i = l, j = r, k = l; k <= r; k++) { kp<Au)u
if (a < b) { 2YY4 XHQS
data[k] = temp[i++]; qpCaW0]7
a = temp; EsX(<bx
} else { \#) YS
data[k] = temp[j--]; =p=/@FN
b = temp[j]; :A @f[Y'9
} )[ZXPD
} T$R#d&t
} `L7^f!
*n&Sd~Mg
/** #V]8FW
* @param data |gu@b~8
* @param l _b-g^#L%
* @param i Qb>("j~Z
*/ c_+fA
private void insertSort(int[] data, int start, int len) { 6fI2y4yEz
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); L?j<KW
} <\Y(+?+uZ
} 41Q)w=hoN
} Et(H6O8
} j nSZ@u
H'/V<%
堆排序： /j$pV
@sZ7Ka
package org.rut.util.algorithm.support; X@tA+
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import org.rut.util.algorithm.SortUtil; RHNAHw9
s[h;9 I1w
/** -=8f*K[W
* @author treeroot \ctzv``/n
* @since 2006-2-2 $!9/s S?
* @version 1.0 Z]TQ+9t
*/ Y%eW6Y#
public class HeapSort implements SortUtil.Sort{ ':_gYA
X o9vE3
/* (non-Javadoc) cQThpgha
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) P, l (4
*/ VWK/(>TP
public void sort(int[] data) { CL7/J[TS
MaxHeap h=new MaxHeap(); kv2o.q
h.init(data); {fl[BX]kZ
for(int i=0;i h.remove(); \I4Uj.'>\
System.arraycopy(h.queue,1,data,0,data.length); W?E,"z
} CPcUB4a%#
%@)q=*=y
private static class MaxHeap{ ONcLhwH
}b}jw.2Wu
void init(int[] data){ \_R<Q?D+
this.queue=new int[data.length+1]; 4]0:zS*O
for(int i=0;i queue[++size]=data; SC2LY
fixUp(size); -#/DK
} ]:?S}DRG
} n[K%Xs)
W1xPK*
private int size=0; J>#yA0QD2
fSVM[
private int[] queue; hslT49m>
lV4TFt,
public int get() { 7SYe:^Dx
return queue[1]; 2h*aWBLk
} )T gfd5B
4h--x~ @
public void remove() { 04v ~K
SortUtil.swap(queue,1,size--); \vc&V8
fixDown(1); tS3&&t
} AT3HHQD
file://fixdown g5Io=e@s
private void fixDown(int k) { !- QB>`7$
int j; 0k?]~f
while ((j = k << 1) <= size) { Y`-q[F?\y
if (j < size %26amp;%26amp; queue[j] j++; t4:/qy
if (queue[k]>queue[j]) file://不用交换 7zE1>.
break; "oZ_1qi<
SortUtil.swap(queue,j,k); <^{(?*
k = j; Nr,I`x\N
} KV&6v`K/N
} F 8sOc&L
private void fixUp(int k) { $J)`Ru6.
while (k > 1) { d`$w3Hy
int j = k >> 1; +cmi?~KS*
if (queue[j]>queue[k]) <GQ=PrT|/
break; gjnEN1T22
SortUtil.swap(queue,j,k); 'IIa,']H
k = j; D5bi)@G7z
} KOXG=P0
} &K[~Ab_
o::9M_;
} 4%_c9nat
MzKl=G
} 09Eg ti.
i-4L{T\K
SortUtil： Ic!x y
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package org.rut.util.algorithm; -:45Q{u/
3&M0@/
import org.rut.util.algorithm.support.BubbleSort; #FRm<9/j
import org.rut.util.algorithm.support.HeapSort; 46\!W(O~y
import org.rut.util.algorithm.support.ImprovedMergeSort; '4~I%Z7L
import org.rut.util.algorithm.support.ImprovedQuickSort; a"g\f{v0AR
import org.rut.util.algorithm.support.InsertSort; j%]sym
import org.rut.util.algorithm.support.MergeSort; R!X+-
import org.rut.util.algorithm.support.QuickSort; if\`M'3Xx
import org.rut.util.algorithm.support.SelectionSort; ){,Mv:#+T
import org.rut.util.algorithm.support.ShellSort; w}$;2g0=a<
FrLv%tK|
/** UEYJd&n0CB
* @author treeroot C;U4`0=8
* @since 2006-2-2 awz.~c++
* @version 1.0 a;~< iB;3"
*/ /#eS3`48
public class SortUtil { "66#F
public final static int INSERT = 1; J[S!<\_!
public final static int BUBBLE = 2; r#w7qEtD
public final static int SELECTION = 3; Z]k@pR !
public final static int SHELL = 4; $1zWQJd[-
public final static int QUICK = 5; !SGRK01
public final static int IMPROVED_QUICK = 6; x=x%F;
public final static int MERGE = 7; +s`cXTlFrk
public final static int IMPROVED_MERGE = 8; ta x:9j|~
public final static int HEAP = 9; !>Q\Y`a,*
~Ij/vyB_
public static void sort(int[] data) { J#3[,~
sort(data, IMPROVED_QUICK); MMD=4;X
} \xC#Zs[<
private static String[] name={ .Xe_Gp"x
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" 368 g>/#'
}; rqm":N8@
-w)v38iX!
private static Sort[] impl=new Sort[]{ /f+BeQ3#/
new InsertSort(), hPgYKa8u
new BubbleSort(), L@Qvj-5e
new SelectionSort(), ?pd/cj^
new ShellSort(), #RSUChe7w
new QuickSort(), DZH2U+K
new ImprovedQuickSort(), Hm|N{
new MergeSort(), Vl<7>
new ImprovedMergeSort(), ~P~q'
new HeapSort() OmfHrlA
}; S-7C'dc
pbWjTI$
public static String toString(int algorithm){ ]8Xip/uE
return name[algorithm-1]; Clap3E|a
} Ja/
`@:TS)6X0
public static void sort(int[] data, int algorithm) { TpYh)=;k
impl[algorithm-1].sort(data); Pl`Nniy
} oY; C[X
eC6wrpZO
public static interface Sort { pY\=f0]
public void sort(int[] data); *1_Ef).
} ,zK E$
;3bUgI}.J
public static void swap(int[] data, int i, int j) { 3QdCu<eBZ
int temp = data; QX=x^(M$m
data = data[j]; yO7#n0q
data[j] = temp; ^/x\HGrw
} Z^_zcH'
} ,]n~j-X