[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; ;'}'5nO=$
} !"E-\cc'
int i1=l; (9]6bd
int i2=mid+1; -w]/7cH
for(int cur=l;cur<=r;cur++){ P$ucL~r
if(i1==mid+1) O#EqG.L5
data[cur]=temp[i2++]; <B)
else if(i2>r) :3^dF}>
data[cur]=temp[i1++]; p x#suy
else if(temp[i1] data[cur]=temp[i1++]; #Ao !>qCE
else 1[-vD=
data[cur]=temp[i2++]; `*aBRwvK~
} Lc]1$
} U;U08/y
u]M\3V.
} 99u/fkL
.x-J44i@/
改进后的归并排序: &yU>2=/T
5/?P|T
package org.rut.util.algorithm.support; @7W?8
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import org.rut.util.algorithm.SortUtil; `\N]wlB2/b
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/** j;\[pg MR/
* @author treeroot ?Vc0)
* @since 2006-2-2 VI_+v[Hk/
* @version 1.0 ] 8Tzr
*/ b7Oj<!Wo`
public class ImprovedMergeSort implements SortUtil.Sort { "|t!7hC
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private static final int THRESHOLD = 10; SkHYXe"]
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/* *5D3vB*S
* (non-Javadoc) xE1'&!4O
* -Sz_mr
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) n@ [
*/ Y:psZ
public void sort(int[] data) { I^_NC&m
int[] temp=new int[data.length]; ()\jCNLT
mergeSort(data,temp,0,data.length-1); 9I.^LZ"
} rF] +,4
"IFgRaP=
private void mergeSort(int[] data, int[] temp, int l, int r) { /t5p-
int i, j, k; ]Blf9h7
int mid = (l + r) / 2; 4h8*mMghs
if (l == r) bL`eiol6
return; 2*2:-ocl$
if ((mid - l) >= THRESHOLD) z%sy$^v@vD
mergeSort(data, temp, l, mid); %e?fH.)
else Td hTQ
insertSort(data, l, mid - l + 1); }mk>!B}=
if ((r - mid) > THRESHOLD) y=Q!-~5|fF
mergeSort(data, temp, mid + 1, r); O/b+CSS1
else C:i|-te
insertSort(data, mid + 1, r - mid); @iLIU}+
H}ZQ?uK;
for (i = l; i <= mid; i++) { |PP.<ce\-
temp = data; <)U4Xz?
} =Op+v"
for (j = 1; j <= r - mid; j++) { (D7$$!}
temp[r - j + 1] = data[j + mid]; _<*Hv*Zm
} )`+YCCa6F
int a = temp[l]; pe.QiMW{8
int b = temp[r]; `A)"%~
for (i = l, j = r, k = l; k <= r; k++) { h<x4YB5Mj
if (a < b) { wCCV2tk
data[k] = temp[i++]; u0 y 1
a = temp; 2@khSWV
} else { 4kl Ao$
data[k] = temp[j--]; i9A~<
b = temp[j]; [4Q"#[V&9
} :O-1rD
} +L%IG
} ub K7B |p
rv7{Ow_Y
/** z|N3G E(.@
* @param data rHz||jjU
* @param l M 2q"dz
* @param i yI3kvh
*/ BRv x[u
private void insertSort(int[] data, int start, int len) { T .n4TmF
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); 1^G{tlA-
} ,[!LCXp
} DjLL|jF
} P_Hv%g
} ig!7BxM)<h
)rtomp:X
堆排序： o:p *_>&
1G^#q,%X_v
package org.rut.util.algorithm.support; GJA`l8`SQ
cg{AMeW
import org.rut.util.algorithm.SortUtil; Log|%P\
S\#17.=
/** iG<Som
* @author treeroot l"+Jc1\X
* @since 2006-2-2 SA"8!soY3
* @version 1.0 J'T=q/
*/ ;zH HIdQ>-
public class HeapSort implements SortUtil.Sort{ <q2?S
(k?7:h
/* (non-Javadoc) oBQm05x"
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ZH 6\><My
*/ l.+yn91%>
public void sort(int[] data) { 3V<&|
MaxHeap h=new MaxHeap(); >I"V],d!6
h.init(data); q_[G1&MC
for(int i=0;i h.remove(); I5ZqBB
System.arraycopy(h.queue,1,data,0,data.length); |> enp>
} 9KuD(EJS
quxdG>8
private static class MaxHeap{ +&=?BC}L9^
#UP~iHbt\
void init(int[] data){ Ea $aUORm
this.queue=new int[data.length+1]; c1XX~8
for(int i=0;i queue[++size]=data; f!_ ctp
fixUp(size); SU.ythU2,c
} MXtkP1A`
} 3'`dFY,
/j2H A^GT
private int size=0; #q\x$
K`-!uZW:B7
private int[] queue; F7*wQ{~
#]Y>KX2HG
public int get() { mN_Z7n;^eh
return queue[1]; c3TKl/
} G&f8n
jM)C4ii.-$
public void remove() { k@mVxnC
SortUtil.swap(queue,1,size--); 4=8QZf0\
fixDown(1); \;X+X,M
} GX{XdJD
file://fixdown Fr2N[\>s
private void fixDown(int k) { K4ZolWbU
int j; eOT+'[3"
while ((j = k << 1) <= size) { J @IS\9O
if (j < size %26amp;%26amp; queue[j] j++; qQ]]~F
if (queue[k]>queue[j]) file://不用交换 ]; $] G-
break; 5*g]qJF
SortUtil.swap(queue,j,k); 9LC&6Q5O&
k = j; i5}4(sV
} 5`D-
} rVnd0K
private void fixUp(int k) { "2ru7Y"
while (k > 1) { Fg]?zEa
int j = k >> 1; XRN+`J
if (queue[j]>queue[k]) _i0kc,*C\
break; _l`e#XbG
SortUtil.swap(queue,j,k); 6A R2htN^
k = j; q!~ -(&S
} a?h*eAAc.
} &EGqgNl
q'[}9e`Q
} w*9br SK
26?W nu60
} W#fZ1E6
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SortUtil： 5K%SL1N
nuQ]8-,
package org.rut.util.algorithm; NE2pL@sk
pmvT$;7I
import org.rut.util.algorithm.support.BubbleSort; ^"\s eS
import org.rut.util.algorithm.support.HeapSort; 8)*2@-Rp
import org.rut.util.algorithm.support.ImprovedMergeSort; )j l8!O7
import org.rut.util.algorithm.support.ImprovedQuickSort; VSX@e|Nj
import org.rut.util.algorithm.support.InsertSort; K6JVg$
import org.rut.util.algorithm.support.MergeSort; ] ]U<UJ
import org.rut.util.algorithm.support.QuickSort; Z4K+ /<I
import org.rut.util.algorithm.support.SelectionSort; U @v*0
import org.rut.util.algorithm.support.ShellSort; PXoz*)tk
:(|'S4z
/** E_z;s3AXQ
* @author treeroot @oP_;G
* @since 2006-2-2 #65^w=Sp}
* @version 1.0 ? 8aaD>OR$
*/ /wShUR{
public class SortUtil { ~T7B$$
public final static int INSERT = 1; WUc#)EEM)
public final static int BUBBLE = 2; {~GYj%-^
public final static int SELECTION = 3; Rgy-OA
public final static int SHELL = 4; f>o,N{|
public final static int QUICK = 5; ,QIF &
public final static int IMPROVED_QUICK = 6; [jdFA<Is
public final static int MERGE = 7; INs!Ame2
public final static int IMPROVED_MERGE = 8; e1myH6$W
public final static int HEAP = 9; d$ACDX2
g1E~+@
public static void sort(int[] data) { A5:qKaAq
sort(data, IMPROVED_QUICK); BaF!O5M
} f"u*D,/sS
private static String[] name={ <:>SGSE9
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" &GTI
}; 3f Xv4R;!:
Am0{8 '
private static Sort[] impl=new Sort[]{ Qhi '')Q
new InsertSort(), Y/<lWbj*A
new BubbleSort(), '+>fFM,*B
new SelectionSort(), F7L&=K$2y
new ShellSort(), d6{Gt"
new QuickSort(), gbeghLP[?
new ImprovedQuickSort(), /I5X"x
new MergeSort(), :AdDLpk3j
new ImprovedMergeSort(), -~[9U,
new HeapSort() /^{BUo
}; 7\zZpPDV
JCcZuwu[
public static String toString(int algorithm){ 9fnA
return name[algorithm-1]; YYEJph@06q
} %=AxJp!a
zJDSbsc$%
public static void sort(int[] data, int algorithm) { N/$`:8"
impl[algorithm-1].sort(data); _-!sBK+F
} nMfFH[I4
/v|"0
public static interface Sort { UUKP"
public void sort(int[] data); LH 3}d<{
} p9U?!L!y
)0vU k
public static void swap(int[] data, int i, int j) { _\PNr.D8
int temp = data; o}Odw;
data = data[j]; -4w=s|#.\
data[j] = temp; PjT=$]
} 1(zsOeX
} H7Uli]e3