[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; V8,$<1Fi;-
} R[_7ab]A
int i1=l; tX)]ZuEi$
int i2=mid+1; 5dL-v&W
for(int cur=l;cur<=r;cur++){ +vYm:
if(i1==mid+1) c4; `3
data[cur]=temp[i2++]; x,p|n
else if(i2>r) | sQ5`lV?
data[cur]=temp[i1++]; px-*uh<
else if(temp[i1] data[cur]=temp[i1++]; BwL:B\
else +;*])N%q
data[cur]=temp[i2++]; ]k,fEn(
} 65<p:
} C?E;sRr0
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} FE_n+^|k<
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改进后的归并排序: | C2k(
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package org.rut.util.algorithm.support; w$&10
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import org.rut.util.algorithm.SortUtil; _ H@pYMNH
HM76%9!
/** jMw;`yh
* @author treeroot (:hPT-1
* @since 2006-2-2 Z#oo8
* @version 1.0 ~u3I=b
*/ .t~I[J\<
public class ImprovedMergeSort implements SortUtil.Sort { *, {b]6v
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private static final int THRESHOLD = 10; wefQmRK
@&2T0UB
/* !(o)*S
* (non-Javadoc) >\>HRyt%
* !CsoTW9C:
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) SJy?^
*/ f|b|\/.=
public void sort(int[] data) { QDgOprha
int[] temp=new int[data.length]; _`;6'}]s
mergeSort(data,temp,0,data.length-1); QY{f=
} o>W}1_
WOg_Pn9HI
private void mergeSort(int[] data, int[] temp, int l, int r) { 6X'RCJu%
int i, j, k; ^ 0TJys%
int mid = (l + r) / 2; 40:YJ_n
if (l == r) Q)Ppx7)
return; KIuYWr7&
if ((mid - l) >= THRESHOLD) rW1>t+
mergeSort(data, temp, l, mid); \!631FcQ
else :jUd?(
insertSort(data, l, mid - l + 1); qed; UyN
if ((r - mid) > THRESHOLD) =Qz8"rt#
mergeSort(data, temp, mid + 1, r); [F6=JZ
else 3z5,4ps
insertSort(data, mid + 1, r - mid); /,B"H@J
0dnm/'L
for (i = l; i <= mid; i++) { no;Yu
temp = data; 9|OQHy
} ^:DlrI$
for (j = 1; j <= r - mid; j++) { - +>~
temp[r - j + 1] = data[j + mid]; 9g 2x+@5T^
} AWf zMJ;VS
int a = temp[l]; q Rtgk
int b = temp[r]; .[CXW2k
for (i = l, j = r, k = l; k <= r; k++) { O?{pln
if (a < b) { ||/noUK
data[k] = temp[i++]; QtX ->6P>
a = temp; n*-#VKK^
} else { U2SxRFs >
data[k] = temp[j--]; HPU7 `b4
b = temp[j]; v3~,1)#aI
} nYE_WXY3V
} 7OW;omT`
} N;ssO,
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/** /'">H-r
* @param data KsHovv-A
* @param l qAG0t{K
* @param i Oys.8%+ P
*/ J.El&Dev
private void insertSort(int[] data, int start, int len) { -;Hd_ ~O>j
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); SYl:X
} iv56zsR
} YDDwvk H
} ;rk}\M$+
} /'ybl^Km
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堆排序： Jk(b=j
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package org.rut.util.algorithm.support; 6,oi(RAf
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import org.rut.util.algorithm.SortUtil; mu:Q2t^
hbN*_[
/** nY(jN D
* @author treeroot '6K WobXm
* @since 2006-2-2 OlV>zam
* @version 1.0 N%>/ e'(
*/ a0AIq44
public class HeapSort implements SortUtil.Sort{ T0aK1Lh
'kYV}rq;l
/* (non-Javadoc) Wp>W?'`
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) @^`f~0#:
*/ J7mT&U&Ru
public void sort(int[] data) { :Z`4ea"w
MaxHeap h=new MaxHeap(); uOZ+9x(
h.init(data); lr^-
for(int i=0;i h.remove(); KnU"49
System.arraycopy(h.queue,1,data,0,data.length); EmY8AN(*
} %OW[rbE.
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private static class MaxHeap{ x}F.<`
{V:?r
void init(int[] data){ `[Lap=.'.
this.queue=new int[data.length+1]; 'v\!}6
for(int i=0;i queue[++size]=data; Sgr<z d'b
fixUp(size); &Vl,x/
} 0Z9jlwcQ
} rytizbc
)(?s=<H
private int size=0; xG<S2R2VQh
S;*,V|#QD
private int[] queue; >"ZTyrK
kv)LH{
public int get() { S,Oy}Nv
return queue[1]; )5]z[sE
} I,?bZ&@8
}eB\k,7L
public void remove() { ZZlR:D
SortUtil.swap(queue,1,size--); [i&z_e)
fixDown(1); 9E (>mN
} cL=P((<K?
file://fixdown 8f29Hj+
private void fixDown(int k) { E1VCm[j2
int j; ?F`lI""E
while ((j = k << 1) <= size) { H&%=>hyX
if (j < size %26amp;%26amp; queue[j] j++; fpoH7Jd V
if (queue[k]>queue[j]) file://不用交换 &I d^n
break; S%Ja:0=}?
SortUtil.swap(queue,j,k); ^hbh|Du
k = j; )?4m}
} '}XW
} }KZ/>Z;^
private void fixUp(int k) { b6NttY!3
while (k > 1) { 8N|*n"`}
int j = k >> 1; u,oxUySeG
if (queue[j]>queue[k]) `cZG&R
break; nPv2: x
SortUtil.swap(queue,j,k); mM}|x~\R
k = j; h8S%Q|-
} b^A&K@[W#,
} 0BE%~W
2%WZ-l!i
} eKu&_q
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} 0A}'.LI
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SortUtil： crvWAsm
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package org.rut.util.algorithm; c#G(7.0MU
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import org.rut.util.algorithm.support.BubbleSort; ]enqkiS
import org.rut.util.algorithm.support.HeapSort; dQizM^j
import org.rut.util.algorithm.support.ImprovedMergeSort; rj{'X /
import org.rut.util.algorithm.support.ImprovedQuickSort; hO(HwG?8t
import org.rut.util.algorithm.support.InsertSort; AM Rj N;
import org.rut.util.algorithm.support.MergeSort; Xe+Hez,
import org.rut.util.algorithm.support.QuickSort; :0srFg?X
import org.rut.util.algorithm.support.SelectionSort; e3[QM
import org.rut.util.algorithm.support.ShellSort; W>@+H"pZ
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/** eyo)Su
* @author treeroot iPkG=*Ip(%
* @since 2006-2-2 ] c'owj
* @version 1.0 *|`'L
*/ X;}_[=-
public class SortUtil { sI^1c$sBN
public final static int INSERT = 1; Ex*g>~e
public final static int BUBBLE = 2; =%RDT9T.
public final static int SELECTION = 3; )3u[btm
public final static int SHELL = 4; zV2c`he%z
public final static int QUICK = 5; ,U<Ku*}B
public final static int IMPROVED_QUICK = 6; AJmS1 B
public final static int MERGE = 7; (/hF~A
public final static int IMPROVED_MERGE = 8; +rql7D0st
public final static int HEAP = 9; B:^U~sR
q].C>R*ux8
public static void sort(int[] data) { P-vA.7
sort(data, IMPROVED_QUICK); 1L$u8P^<
} }f({03$
private static String[] name={ Gn_v}31d%
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" -''vxt?7H&
}; &0ULj6jj
!p9BH6$`
private static Sort[] impl=new Sort[]{ s"Kp+tTWj
new InsertSort(), Z:n33xh=<
new BubbleSort(), .{8lG^0U<
new SelectionSort(), {'vvE3iZ
new ShellSort(), xt`znNN
new QuickSort(), Ezml LFp.
new ImprovedQuickSort(), ^Xb!dnT.*a
new MergeSort(), JP@UvDE|
new ImprovedMergeSort(), mKn[>M1
new HeapSort() 0,/[r/=jT
}; {'X"9@
1r.q]^Pq~
public static String toString(int algorithm){ >>!+Ri\@
return name[algorithm-1]; c=Z#7?k=Uz
} n09|Jzv9
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public static void sort(int[] data, int algorithm) { ivGxtx
impl[algorithm-1].sort(data); U'#{v7u
} Xi|v!^IT
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public static interface Sort { pF8'S{y
public void sort(int[] data); J7E/2Sl
} 1yE~#KpH
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public static void swap(int[] data, int i, int j) { -,+JE0[
int temp = data; ~#j`+
data = data[j]; Y#N'bvE|%
data[j] = temp; |Z"hq
} 9PR&/Q F5
} _wqFKj