[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; ef]B9J~h
} w6zBVi
int i1=l; ?U9/fl
int i2=mid+1; ?[= U%sPu=
for(int cur=l;cur<=r;cur++){ ;u!?QSvb
if(i1==mid+1) r0\f;q
data[cur]=temp[i2++]; ImkrV{,e
else if(i2>r) oY3>UZ5\
data[cur]=temp[i1++]; 8T5k-HwE
else if(temp[i1] data[cur]=temp[i1++]; Y1\K;;X
else {B{i(6C(
data[cur]=temp[i2++]; j\2[H^
} `gguip-C
} C{m&}g`
Cvn$]bt/s
} IN!02`H
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改进后的归并排序: b X,Siz:F
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package org.rut.util.algorithm.support; 8z T0_vw
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import org.rut.util.algorithm.SortUtil; ti_u!kNv
!#WqA9<
/** +zO]N&
* @author treeroot .Q\\dESn"
* @since 2006-2-2 ZBM!MSf:
* @version 1.0 'mV:@].le
*/ q627<
public class ImprovedMergeSort implements SortUtil.Sort { e}"wL g]
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private static final int THRESHOLD = 10; A7Y_HIo
P. V\ov7m2
/* .6T4z7I
* (non-Javadoc) 8pe0$r`b
* uxDLDA$;
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) a$}6:E
*/ "tR}j,=S:D
public void sort(int[] data) { 9k>uRV6
int[] temp=new int[data.length]; |]ucHV
mergeSort(data,temp,0,data.length-1); )f*Iomp]@
} h~UJCnzS
<GfVMD
private void mergeSort(int[] data, int[] temp, int l, int r) { a%J/0'(d
int i, j, k; ?qT(3C9p
int mid = (l + r) / 2; !J^tg2M8:
if (l == r) *cNk>y
return; fusPMf *[
if ((mid - l) >= THRESHOLD) W"qL-KW
mergeSort(data, temp, l, mid); O E|+R4M
else B,y3] g6u
insertSort(data, l, mid - l + 1); 3$_2weZxYn
if ((r - mid) > THRESHOLD) UR:n5V4
mergeSort(data, temp, mid + 1, r); 0wvU?z%WK
else JDhwN<0R
insertSort(data, mid + 1, r - mid); 9d\N[[Vu]R
L82NP)St
for (i = l; i <= mid; i++) { x# 8IZ
temp = data; h48 bb.p2
} E .;io*0
for (j = 1; j <= r - mid; j++) { F#1kZ@nq
temp[r - j + 1] = data[j + mid]; Oz>io\P94
} ^!uO(B&
int a = temp[l]; 2"M_sL
int b = temp[r]; .^H1\p];Lw
for (i = l, j = r, k = l; k <= r; k++) { @ ;J|xkJ
if (a < b) { #313 (PWH
data[k] = temp[i++]; JtmQzr0>
a = temp; ?>?ZAr
} else { _85E=
data[k] = temp[j--]; viV-e$s`.
b = temp[j]; P^4'|#~2T
} =|JKu'
} gA+YtU{z
} uI9lK
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/** h/=-tr
* @param data Xz* tbW#
* @param l 0UjyMEiK
* @param i 9|a)sb7/
*/ *1v_6<;2i<
private void insertSort(int[] data, int start, int len) { v>k b^38
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); 6`j<l5-h
} yu_gNro L
} +/_!P;I
} 4Q&mC"
} opnkmM&[
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堆排序： z1qUz7
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package org.rut.util.algorithm.support; ZjavD^ky
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import org.rut.util.algorithm.SortUtil; dw99FA6
!Iko0#4i
/** p1?J
* @author treeroot LVWxd}0
* @since 2006-2-2 yOM -;h
* @version 1.0 h!~|6nj
*/ p+5#dbyr
public class HeapSort implements SortUtil.Sort{ +E `063
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/* (non-Javadoc) Z%A<#%
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) @Zh8 QI+
*/ Y~x`6
public void sort(int[] data) { Wd1 IX^7C%
MaxHeap h=new MaxHeap(); tUn&z?7bF
h.init(data); 5 u"nxT
for(int i=0;i h.remove(); R+x%r&L5F
System.arraycopy(h.queue,1,data,0,data.length); '>4+WZ1w5
} +-",2d+g
:az!H"4W/
private static class MaxHeap{ ?n73J wH
a6OrE*x:D
void init(int[] data){ 7dsnv)(v
this.queue=new int[data.length+1]; wsna5D6i
for(int i=0;i queue[++size]=data; L5TNsLx(
fixUp(size); '1qAZkz
} fCs\Q
} Ds;Rb6WcnY
uk`d,xF
private int size=0; :v''"+\
)lE3GDAPgZ
private int[] queue; j(UX 6lR
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public int get() { 6Lav.x\W
return queue[1]; )3+xsnv
} m] EDuW
aJ% e'F[
public void remove() { R,fMZHAG
SortUtil.swap(queue,1,size--); ?%_]rr9
fixDown(1); [%7IQ4`{
} 60(}_%
file://fixdown 8UjCX[v
private void fixDown(int k) { t Qp*'
int j; xu0;a
while ((j = k << 1) <= size) { Y+}OClS
if (j < size %26amp;%26amp; queue[j] j++; !#l0@3
if (queue[k]>queue[j]) file://不用交换 ;e`D#khB
break; VuP#b'g=|]
SortUtil.swap(queue,j,k); }D8~^
k = j; q\-xg*'
} *_}IeNc
} LS*{]@8q
private void fixUp(int k) { Sj,4=a
while (k > 1) { V;/ XG}M
int j = k >> 1; w;z@py
if (queue[j]>queue[k]) WXRHG)nvL
break; {[H4G,QK
SortUtil.swap(queue,j,k); ~x76{.gT
k = j; Q'>_59
} #mi0x06
} 5)/4)0
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} Q#d+IIR0gK
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} z|oA{VxW>
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SortUtil： q(w1VcLZ
q[Sp|C6x
package org.rut.util.algorithm; Q{(,/}kA-
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import org.rut.util.algorithm.support.BubbleSort; 64IeCAMVo
import org.rut.util.algorithm.support.HeapSort; }V93~>
import org.rut.util.algorithm.support.ImprovedMergeSort; XPR:_
import org.rut.util.algorithm.support.ImprovedQuickSort; [:/7OM
import org.rut.util.algorithm.support.InsertSort; &@`H^8
import org.rut.util.algorithm.support.MergeSort; 3P=Eb!qtdD
import org.rut.util.algorithm.support.QuickSort; ba8-XA_~U
import org.rut.util.algorithm.support.SelectionSort; =1uj1.h
import org.rut.util.algorithm.support.ShellSort; )dzjz%B)
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/** *NX*/(Q
* @author treeroot *$*nY [/5
* @since 2006-2-2 iq[2H$
* @version 1.0 o} bj!h]N
*/ #I*ht0++
public class SortUtil { q=j/s4~
public final static int INSERT = 1; SWe!9Y$
public final static int BUBBLE = 2; 7,&3=R<
public final static int SELECTION = 3; z}Mb4{d1
public final static int SHELL = 4; '/]fZ|
public final static int QUICK = 5; 4)c"@Zf
public final static int IMPROVED_QUICK = 6; 0t/z"
public final static int MERGE = 7; %te'J G<
public final static int IMPROVED_MERGE = 8; l[x`*+ON:2
public final static int HEAP = 9; 1^Y:XJ73
,vHX>)M|
public static void sort(int[] data) { yA`]%U((
sort(data, IMPROVED_QUICK); yx`r;|ds}
} ]#WX|0''^
private static String[] name={ Hme@9(zD.
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" SFm.<^6
}; z!uB&2C{k
`G:qtHn"Q<
private static Sort[] impl=new Sort[]{ ?_<UOb*
new InsertSort(), X/?h!Y}
new BubbleSort(), ]pucv!
new SelectionSort(), jv?aB
new ShellSort(), k6 h^
new QuickSort(), 1v8:,!C
new ImprovedQuickSort(), dBi3ZCAF
new MergeSort(), S+bWD7
new ImprovedMergeSort(), /Va&k4
new HeapSort() SgQmYaa&
}; LI5cUCl
^ZViQ$a"h;
public static String toString(int algorithm){ Z<m'he
return name[algorithm-1]; "}y3@ M^
} ybuSqFy`$
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public static void sort(int[] data, int algorithm) { |M{,}.*CU
impl[algorithm-1].sort(data); ysw6hVb
} ?X5glDZ$
$SD@D6`lL
public static interface Sort { ~{]m8a/ `6
public void sort(int[] data); 28ov+s~1+-
} V'BZ=.=
^.$r1/U
public static void swap(int[] data, int i, int j) { @kgpq
int temp = data; JOoLHZQ1v
data = data[j]; ;*$8iwBQ_
data[j] = temp; ef1N#z%gt
} crOtQ
} <@;xV_`X+