[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; ESUO I
} (4?^X
int i1=l; =cO5Nt
int i2=mid+1; ?d+ri
for(int cur=l;cur<=r;cur++){ [5tvdW6Z&
if(i1==mid+1) hV:++g
data[cur]=temp[i2++]; "!CVm{7[
else if(i2>r) p=3t!3
data[cur]=temp[i1++]; ;A4j_8\[
else if(temp[i1] data[cur]=temp[i1++]; :zY;eJKm
else f@[)*([
data[cur]=temp[i2++]; F{^\vFp
} Y`d@4*FN$
} (V1;`sI8
w 62m}5eA
} [XttT
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改进后的归并排序: 'n=bQ"bQu
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package org.rut.util.algorithm.support; }ice*3'3
B!&y>Z^$
import org.rut.util.algorithm.SortUtil; K1o>>388G
l(Dr@LB~
/** `NsQ&G
* @author treeroot !&:Cp_
* @since 2006-2-2 ~`="tzr:
* @version 1.0 ;K~=? k
*/ {~w(pAx
public class ImprovedMergeSort implements SortUtil.Sort { h(R7y@mp\0
V'tR \b
private static final int THRESHOLD = 10; HEAW](s
%8wBZ~1-
/* x)Zb:"
* (non-Javadoc) :,M+njcFc
* ?zQW9e
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) &iZt(XD
*/ K\xnQeS<W
public void sort(int[] data) { QT zN
int[] temp=new int[data.length]; `JY+3d,Ui
mergeSort(data,temp,0,data.length-1); E)`0(Z:E
} /KNR;n'
J9OL>!J
private void mergeSort(int[] data, int[] temp, int l, int r) { QAt]sat
int i, j, k; ?3a=u<
int mid = (l + r) / 2; V)`A,7X
if (l == r) egBk7@Ko
return; zyO=x4U8
if ((mid - l) >= THRESHOLD) ,i|K} Y&
mergeSort(data, temp, l, mid); ^/$dSXKF
else pJs`/
insertSort(data, l, mid - l + 1); vq.o;q /
if ((r - mid) > THRESHOLD) KC"&3
mergeSort(data, temp, mid + 1, r); cJbv,RV<
else tQRbNY#}Z
insertSort(data, mid + 1, r - mid); GyMN;|
ij#v_~g3
for (i = l; i <= mid; i++) { i/I
temp = data; ]*'_a@h
} lNf);!}SM
for (j = 1; j <= r - mid; j++) { Nsq=1) <
temp[r - j + 1] = data[j + mid]; U<;{_!]
} bq)1'beW
int a = temp[l]; S7WHOr9XMV
int b = temp[r]; (n8?+GCa
for (i = l, j = r, k = l; k <= r; k++) { )">#bu$
if (a < b) { Q)BSngW+
data[k] = temp[i++]; bcjh3WP
a = temp; YFPse.2$a
} else { pdER#7Tq
data[k] = temp[j--]; Fx}v.A5
b = temp[j]; *0Z6H-Do,
} 3 !8#wn
} (9ZW^flY
} AZE%fOG<i
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/** kr|r-N`
* @param data (T$cw(!
* @param l 8(l0\R,%+z
* @param i 5'+g[eNyBV
*/ }No#_{
private void insertSort(int[] data, int start, int len) { R.2i%cU
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); n0gjcDHQ
} -?:8sv*X
} lP)n$?u
} 5+!yXkE^e
} Pv,PS.,-
j>?nL~{
堆排序： :RukW.MR
lK7:qo
package org.rut.util.algorithm.support; }~=<7|N.
@%2crJnkS
import org.rut.util.algorithm.SortUtil; F):kF_ho
$H.U ~
/** WRkuPj2
* @author treeroot W( sit;O
* @since 2006-2-2 BeQ'\#q,
* @version 1.0 Ix,b-C~
*/ N0}[&rE 8
public class HeapSort implements SortUtil.Sort{ "%+||IyW
4[gbRn'
/* (non-Javadoc) ": BZZ\!
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) R!7--]Wcg
*/ "PElQBLP:
public void sort(int[] data) { 3BGcDyYE
MaxHeap h=new MaxHeap(); 9<y{:{i
h.init(data); ME]7e^
for(int i=0;i h.remove(); :|S[i('
System.arraycopy(h.queue,1,data,0,data.length); E$4H;SN \
} B8T5?bl
w5s&Ws
private static class MaxHeap{ w5)KWeGa
"N_@q2zF
void init(int[] data){ /O$~)2^h
this.queue=new int[data.length+1]; Q.7X3A8
for(int i=0;i queue[++size]=data; z1,#ma}.
fixUp(size); m(:R(K(je
} S1)g\Lv
} ~N| aCi-X
bA Yp }
private int size=0; NX(IX6^y
SeS ZMv
private int[] queue; *c/|/
%rnRy<9
public int get() { YqXN|&
return queue[1]; >7X5/z
} 4IB`7QJq
9;vES^
public void remove() { ~2XGw9`J2
SortUtil.swap(queue,1,size--); jqj}j2 9
fixDown(1); }*%=C!m4R!
} >wb*kyO7(#
file://fixdown )v+&l9D
private void fixDown(int k) { oNl-!W
int j; 5>CeFy
while ((j = k << 1) <= size) { ,K6ODtw.
if (j < size %26amp;%26amp; queue[j] j++; k5bv57@
if (queue[k]>queue[j]) file://不用交换 h82y9($cZ
break; &WAU[{4W
SortUtil.swap(queue,j,k); +/n]9l]#h
k = j; \8a014
} !=;Evf
} ?wmu0rR
private void fixUp(int k) { knHrMD;
while (k > 1) { XAF]B,h=
int j = k >> 1; %jq R^F:J
if (queue[j]>queue[k]) [a$1{[|)
break; xOg|<Nnl
SortUtil.swap(queue,j,k); *kF/yN
k = j; jL5O{R[ x:
} ^tm2Duv
} ;UX9Em
/i Xl]<
} F$JA IL{W
%Gu=Dkz
} RiZ}cd
hZUS#75M5
SortUtil： jL4"FTcE]3
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package org.rut.util.algorithm; hhylsm
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import org.rut.util.algorithm.support.BubbleSort; W0U|XX!&
import org.rut.util.algorithm.support.HeapSort; F/A)2 H_
import org.rut.util.algorithm.support.ImprovedMergeSort; CnY dj~
import org.rut.util.algorithm.support.ImprovedQuickSort; 4U)%JK.ta
import org.rut.util.algorithm.support.InsertSort; $1)NYsSH/H
import org.rut.util.algorithm.support.MergeSort; Sqmjf@o$>
import org.rut.util.algorithm.support.QuickSort; Y%]g,mG
import org.rut.util.algorithm.support.SelectionSort; 93w$ck},?G
import org.rut.util.algorithm.support.ShellSort; e*Nm[*@UW
UQ^ )t ]
/** jl]p e7-
* @author treeroot AC fhy[,
* @since 2006-2-2 B1i'Mzm-4
* @version 1.0 \[+':o`LH
*/ ZWx[@5
public class SortUtil { QiRx2Z*\
public final static int INSERT = 1; }!s$ /Kn
public final static int BUBBLE = 2; [ CU8%%7
public final static int SELECTION = 3; 55>+%@$,a
public final static int SHELL = 4; c No)LF
public final static int QUICK = 5; ,<OS:]
public final static int IMPROVED_QUICK = 6; Wk-.dJ
public final static int MERGE = 7; ND 8;1+3
public final static int IMPROVED_MERGE = 8; b_~KtMO
public final static int HEAP = 9; 'e x/IqbK
H0.&~!,*
public static void sort(int[] data) { l$!NEOK
sort(data, IMPROVED_QUICK); =<=[E:B
} )In;nc
private static String[] name={ X)[QEq^
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" j=>WWlZ
}; e<Oz%
V-i:t,*lk(
private static Sort[] impl=new Sort[]{ Hpp;dG
new InsertSort(), _1$+S0G;
new BubbleSort(), F20%r 0
new SelectionSort(), 1&kf2\S
new ShellSort(), )=,;-&AR
new QuickSort(), +#'QP#
new ImprovedQuickSort(), Xd~lifF
new MergeSort(), 2b#>~
new ImprovedMergeSort(), ?* dfIc
new HeapSort() $~A\l@xAG
}; zfml^N
gp{P _
public static String toString(int algorithm){ mA3yM#
return name[algorithm-1]; hJJo+NNN
} (jE[W:
$:DhK
public static void sort(int[] data, int algorithm) { hJ V*
impl[algorithm-1].sort(data); <jVk}gi)Jp
} k1FG$1.
~BI! l
public static interface Sort { <*{(>
public void sort(int[] data); -f(<2i
} gBd~:ZUa
_NbhWv
public static void swap(int[] data, int i, int j) { dFpP_U
int temp = data; L w/ZKXDU2
data = data[j]; MS%h`Ypo
data[j] = temp; NsSl|m
} sWLH"'Z
} WOGMtT%