[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; d{LQr}_o$$
} +^6v%z
int i1=l; dqvgyyq
int i2=mid+1; -S(_ZbeN
for(int cur=l;cur<=r;cur++){ VN1a\
if(i1==mid+1) [!v| M
data[cur]=temp[i2++]; s3LR6Z7;i
else if(i2>r) J&IFn/JK$
data[cur]=temp[i1++]; G3G"SJ np
else if(temp[i1] data[cur]=temp[i1++]; 2\,vq R
else 5E#koy7 $s
data[cur]=temp[i2++]; t,8p}2,$
} tR]1c
} # Y*cLN`Y7
B?xu!B,
} ZoiCdXvTN
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改进后的归并排序: 1K;i/
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package org.rut.util.algorithm.support; $K,6!FyBa
^5l4D3@E
import org.rut.util.algorithm.SortUtil; q&-A}]
V %cU@
/** :K)=Hf2y
* @author treeroot QzQTE-SQ
* @since 2006-2-2 NNQro)Lpe
* @version 1.0 EPz$`#Sh"
*/ /?; 8F
public class ImprovedMergeSort implements SortUtil.Sort { _S(]/d(c
5[Ryc[
private static final int THRESHOLD = 10; uT}Jw
| ZI~#V
/* E!4Qc+.
* (non-Javadoc) Q1Jkt
* ,cvLvN8
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) gJyFt8Z<
*/ oJk$ +v6
public void sort(int[] data) { QrP$5H{[E
int[] temp=new int[data.length]; I!)gXtJA"
mergeSort(data,temp,0,data.length-1); hr<E%J1k%
} \kpk-[W*x{
R;X8%'
private void mergeSort(int[] data, int[] temp, int l, int r) { z:aT5D
int i, j, k; s68EzFS
int mid = (l + r) / 2; .~4>5W"u
if (l == r) %^l77:O
return; m4@y58n=
if ((mid - l) >= THRESHOLD) d8b'Gjwtw
mergeSort(data, temp, l, mid); R0y@#}JH
else 0 mWfR8h0
insertSort(data, l, mid - l + 1); ><X!~by
if ((r - mid) > THRESHOLD) TA}z3!-y*
mergeSort(data, temp, mid + 1, r); Qhnz7/a9
else >8V;:(nt
insertSort(data, mid + 1, r - mid); .,K?(O4AY
,~Y5vnaOQ
for (i = l; i <= mid; i++) { b&g9A{t
temp = data; $ ;/Ny)"
} &Z+a (
for (j = 1; j <= r - mid; j++) { )>ed6A1
temp[r - j + 1] = data[j + mid]; [|2uu."$
} @NXGVmY1}
int a = temp[l]; $J#}3;a
int b = temp[r]; ->-
for (i = l, j = r, k = l; k <= r; k++) { T[=XGAJ
if (a < b) { <G59>H5
data[k] = temp[i++]; a$MMp=p
a = temp; ]t|KFk!)
} else { oy'Q#!
data[k] = temp[j--]; -/aDq?<<
b = temp[j]; /h0<0b?i
} kRgyvA,*;
} {sy#&m(el
} g S;p::
Uq/(xh,t5
/** [?BmW{*u.
* @param data 2I:vie
* @param l b9(d@2MtK
* @param i #3$U&|`
*/ %2<chq
private void insertSort(int[] data, int start, int len) { &L-y1'i=j
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); PZO7eEt8
} @ -JD`2z
} q<}5KY
} ^Y xqJy
} P_t8=d
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堆排序： _c%]RE
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package org.rut.util.algorithm.support; F5%-6@=
3vOI=ar=L~
import org.rut.util.algorithm.SortUtil; {R[lsdH(X
0-g,C=L
/** -,96Qg4vI
* @author treeroot 0At??Zpy
* @since 2006-2-2 b]mRn{r?
* @version 1.0 DB_ x
*/ 71Ssk|L
public class HeapSort implements SortUtil.Sort{ 9U58#
/U)w:B+p/g
/* (non-Javadoc) K4xZT+Qb
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) %yQ-~T@
*/ g4d5G=y
public void sort(int[] data) { mCtuyGY
MaxHeap h=new MaxHeap(); )xP]rOT
h.init(data); ~@z5Ld3xz
for(int i=0;i h.remove(); @P"q`*
System.arraycopy(h.queue,1,data,0,data.length); E[LXZh
} gi:;{
tF&%7(EU3
private static class MaxHeap{ uGJeQ
\XMl8G
void init(int[] data){ Lq LciD
this.queue=new int[data.length+1]; )TM![^d
for(int i=0;i queue[++size]=data; N{P (ym2yR
fixUp(size); 1_/\{quE
} D}!U?]la&
} {C*mn!u
*NDLGdQqz
private int size=0; v{=-#9-4 &
Q%QpG)E
private int[] queue; G`mC=*Ma;
Qoq@=|7kxa
public int get() { ~srmlBi6
return queue[1]; 7z=Ss'O]
} TDY}oGmNn
fUb5KCZ
public void remove() { SNff
SortUtil.swap(queue,1,size--); 8c__ U<
fixDown(1); oLX6w
} `M4;aN
file://fixdown MH"c=mL:
private void fixDown(int k) { I|9e4EX{y
int j; 43:~kCF[s
while ((j = k << 1) <= size) { sj. eJX"z
if (j < size %26amp;%26amp; queue[j] j++; Um15@p;
if (queue[k]>queue[j]) file://不用交换 vn0XXuquzC
break; yQ+#Tlji
SortUtil.swap(queue,j,k); m98k/w_
k = j; EE&~D~yHUL
} yYdXAenQ
} fgl"ox
private void fixUp(int k) { YQ37P?u@
while (k > 1) { Ks X@e)8u
int j = k >> 1; j@kBCzX
if (queue[j]>queue[k]) e@0wF59
break; [Bpgb57En
SortUtil.swap(queue,j,k); +#Ov9b
k = j; )_.@M '?
} h{<^?=
} |EU}&k2
0<v~J9i
} )zUV6U7v
fb`VYD9[^
} qI;k2sQR
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SortUtil： hUA3(!0)
tk}qvW.Ii
package org.rut.util.algorithm; ,*S?L qv^
3tIIBOwg[
import org.rut.util.algorithm.support.BubbleSort; 1oX"}YY1
import org.rut.util.algorithm.support.HeapSort; ~Zaxn~u:
import org.rut.util.algorithm.support.ImprovedMergeSort; sur2Mw(M"
import org.rut.util.algorithm.support.ImprovedQuickSort; rM bb%d:
import org.rut.util.algorithm.support.InsertSort; |[o2S90
import org.rut.util.algorithm.support.MergeSort; r*+9<8-ZX<
import org.rut.util.algorithm.support.QuickSort; VWfrcSZg6M
import org.rut.util.algorithm.support.SelectionSort; 0U`Ic_.
import org.rut.util.algorithm.support.ShellSort; Jz%&-e3
:?RK>}4|F
/** S~Q7>oNm
* @author treeroot \3)%p('
* @since 2006-2-2 A%+~
* @version 1.0 >t*zY~R.
*/ 7qW:^2y
public class SortUtil { Ubn5tN MK
public final static int INSERT = 1; i7fpl
public final static int BUBBLE = 2; b>2u>4
public final static int SELECTION = 3; V!},a@>p
public final static int SHELL = 4; 'd6hQ4Vw4
public final static int QUICK = 5; k,?Y`s
public final static int IMPROVED_QUICK = 6; =$BgIt
public final static int MERGE = 7; 0^["&K/
public final static int IMPROVED_MERGE = 8; N.-Ryj&9
public final static int HEAP = 9; *[yCcqN.
qKO\;e*
public static void sort(int[] data) { wc__g8?'
sort(data, IMPROVED_QUICK); UdL`.D,
} 2s6Vy
private static String[] name={ 1Tiq2+hmf
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" pd7FU~-
}; >Q5 SJZ/
h Qu9ux
private static Sort[] impl=new Sort[]{ kN]#;R6
new InsertSort(), lc5NC;JR
new BubbleSort(), aL=VNZ!Pqc
new SelectionSort(), &G<ZK9Ot}0
new ShellSort(), jsez$m%vs
new QuickSort(), l0Pg`wH,
new ImprovedQuickSort(), u:,B"!
new MergeSort(), 0|GxOzNd
new ImprovedMergeSort(), :K8T\
new HeapSort() ,Y!T!o}1
}; ~s5Sk#.z5
DK)qBxc8
public static String toString(int algorithm){ cJ[n<hTv
return name[algorithm-1]; b<5:7C9z
} Vn8Qsf1f
,vN#U&RS
public static void sort(int[] data, int algorithm) { 8u+ (+25
impl[algorithm-1].sort(data); `H+Eo<U
} PL8akA#
0IA '8_K
public static interface Sort { P_ZguNH
public void sort(int[] data); K8ThZY%
} Ak}l6{ ..
`L;I/Hp
public static void swap(int[] data, int i, int j) { BAKfs/N
int temp = data; qx!IlO
data = data[j]; &12aI|u^<
data[j] = temp; l0@$]76cX;
} {H>iL
} B2Orw8F