[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; /8\&f%E
} +Uq:sfj,
int i1=l; 1C=P#MU`
int i2=mid+1; /ASI0h
for(int cur=l;cur<=r;cur++){ P'9io!Z-s
if(i1==mid+1) WI_mJ/2
data[cur]=temp[i2++]; Y26l,XIV
else if(i2>r) `0|&T;7
data[cur]=temp[i1++]; 8T )ELhTj
else if(temp[i1] data[cur]=temp[i1++]; JSK5x(GlH
else ,D,f9
data[cur]=temp[i2++]; y|{?>3
} \'Kj.EO{?$
} #`0z=w/)
ya g
} }#5roNH~Z
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改进后的归并排序: a' o8n6i
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package org.rut.util.algorithm.support; h\\2r>
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import org.rut.util.algorithm.SortUtil; "0zXpQi,B
M|e n>P
/** (Gc`3jJ
* @author treeroot =3dbw8I
* @since 2006-2-2 <|Eby!KXR
* @version 1.0 |S`yXsg
*/ 'xoE [0!
public class ImprovedMergeSort implements SortUtil.Sort { n4T2'e
p+UHJ&
private static final int THRESHOLD = 10; <JM%Kn )
^Jl!WH=20}
/* +gCy@_2;
* (non-Javadoc) P Xn>x8z
* 1'm`SRX#e
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) i}F;fWZ`
*/ )h_7 2
public void sort(int[] data) { !nBm}E7d
int[] temp=new int[data.length]; [k7N+W8
mergeSort(data,temp,0,data.length-1); fUKdC\WL
} udI:]:,P
`+Z#*lj|@
private void mergeSort(int[] data, int[] temp, int l, int r) { bK$D lBZ
int i, j, k; rRrW
int mid = (l + r) / 2; mW0&uSMD
if (l == r) ieRBD6_
return; G:C6`uiy`
if ((mid - l) >= THRESHOLD) 8kM0
mergeSort(data, temp, l, mid); <ZC^H
else '# IuY
insertSort(data, l, mid - l + 1); JX$NEq(
if ((r - mid) > THRESHOLD) (g2r\hI
mergeSort(data, temp, mid + 1, r); NF(IF.8G
else XAxI?y[c
insertSort(data, mid + 1, r - mid); `m;"I
Q[Sd
for (i = l; i <= mid; i++) { s5aOAyb*w
temp = data; (VPM>ndkw
} K(KP3Q
for (j = 1; j <= r - mid; j++) { ) wo2GF
temp[r - j + 1] = data[j + mid]; [Ro0eH
} /Q>{YsRRB
int a = temp[l]; 3/IWO4?_
int b = temp[r]; dzE Q$u/I
for (i = l, j = r, k = l; k <= r; k++) { ?$@KwA
if (a < b) { m-S33PG{
data[k] = temp[i++]; &G|jzXE
a = temp; YEPG[W<kg
} else { 5OW8G][
data[k] = temp[j--]; b|8>eY
b = temp[j]; ,#jhKnk2e
} +9 p`D
} 2|H91Y2
} &c?hJ8"
Ed0>R<jR9
/** q|$>H6H4b
* @param data W*rU,F|9
* @param l NRuG?^/}d
* @param i #[0\=B-
*/ BOiz ~h6
private void insertSort(int[] data, int start, int len) { ctUF/[_w;
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); g=g.GpFt
} <AAZ8#^
} r|\'9"@
} eo*u(@
} 6n6VEwYj
[T[9*6Kt
堆排序： 6:@t=C
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package org.rut.util.algorithm.support; 'UvS3]bSYW
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import org.rut.util.algorithm.SortUtil; kGuk -P
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/** q>|[JJ*6_N
* @author treeroot &A9A#It
* @since 2006-2-2 #C,f/PXfaB
* @version 1.0 bu"68A;>
*/ 3+8"
public class HeapSort implements SortUtil.Sort{ ,+f0cv4
m~j\?mb{+
/* (non-Javadoc) 7=p-A_X
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 'D0X?2
*/ R|)2Dg
public void sort(int[] data) { |N=@E,33
MaxHeap h=new MaxHeap(); [ 4Y `O
h.init(data); `k}l$ih`X
for(int i=0;i h.remove(); e9Ul A
System.arraycopy(h.queue,1,data,0,data.length); Il^\3T+
} BvZ^^IUb
<`p75B
private static class MaxHeap{ APtselC
7tfivIj)e
void init(int[] data){ !,6v=n[Nz
this.queue=new int[data.length+1]; _D2bGZN
for(int i=0;i queue[++size]=data; Y7:Y{7E7
fixUp(size); 9"HmHy&:E
} \Ul.K!b7
} |DFvZ6}
}rY?=I
private int size=0; }$0xt'q&
QLB1:O>
private int[] queue; g<rKV+$6
RFn0P)9&
public int get() { Oa}V>a
return queue[1]; VTJIaqw
} i#]aV]IT
1t\b a1x
public void remove() { Z4HA94
SortUtil.swap(queue,1,size--); o1#:j?sN
fixDown(1); AJ#m6`M+EK
} .W@(nQ-<
file://fixdown $['7vcB^
private void fixDown(int k) { Tn@UX(^,
int j; g* \P6
while ((j = k << 1) <= size) { Yt/SnF
if (j < size %26amp;%26amp; queue[j] j++; ,\S pjE
if (queue[k]>queue[j]) file://不用交换 da00p-U
break; hSkc9jBF
SortUtil.swap(queue,j,k); W3jXZ>
k = j; 0tW<LR-}E
} Pn+IJ=0Y
} ,XeyE;||
private void fixUp(int k) { 9b"9m*gC
while (k > 1) { `s>UU- 9
int j = k >> 1; ib(>vp$V
if (queue[j]>queue[k]) SvX=isu!.
break; UBhciZ
SortUtil.swap(queue,j,k); Y3P.|
k = j; ];pf
} ]<8B-D?Z
} 8NaL{j1`
zmB31' _
} FI1THzW4J
GJIWG&C03
} >k&8el6h
Q$|^~
SortUtil： R,x>$n
GP[6nw_'^
package org.rut.util.algorithm; <DeKs?v
J7'f@X~nM
import org.rut.util.algorithm.support.BubbleSort; X!7VyE+n
import org.rut.util.algorithm.support.HeapSort; ] Wx>)LT
import org.rut.util.algorithm.support.ImprovedMergeSort; IP30y>\
import org.rut.util.algorithm.support.ImprovedQuickSort; mFqSD
import org.rut.util.algorithm.support.InsertSort; " K 8&{=
import org.rut.util.algorithm.support.MergeSort; ySwYV
import org.rut.util.algorithm.support.QuickSort; Cdp]Nv6
import org.rut.util.algorithm.support.SelectionSort; 4?>18%7&
import org.rut.util.algorithm.support.ShellSort; I!$jYY2
Ic[}V0dk
/** i<4>\nc
* @author treeroot pKt-R07*
* @since 2006-2-2 )YzHk ;(
* @version 1.0 fJ)N:q`
*/ fg9?3x Z
public class SortUtil { JJ/1daj
public final static int INSERT = 1; ,&.W6sW
public final static int BUBBLE = 2; Z0[)u_<
public final static int SELECTION = 3; )%iRZ\`f
public final static int SHELL = 4; F>~ xzc
public final static int QUICK = 5; JkSdLj
public final static int IMPROVED_QUICK = 6; yaH Trh%
public final static int MERGE = 7; -ajM5S=d*
public final static int IMPROVED_MERGE = 8; IPl@ DH
public final static int HEAP = 9; SwdC,
I#|ocz
public static void sort(int[] data) { .q0218l:dF
sort(data, IMPROVED_QUICK); ;YK!EMM4!h
} Aautih@LX
private static String[] name={ gEZwW]r-
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" NXzU0
}; tmO;:n<N
)Qh>0T+(
private static Sort[] impl=new Sort[]{ cS<TmS!
new InsertSort(), Qw24/DJK
new BubbleSort(), Z69+yOJI
new SelectionSort(), N#(jK1`y
new ShellSort(), 8{R_6BS
new QuickSort(), ! jbEm8bt
new ImprovedQuickSort(), _Kc1
new MergeSort(), Dh2:2Rz=#7
new ImprovedMergeSort(), 2.[_t/T
new HeapSort() Y%<`;wK=^
}; #*!+b
(Ij0AeJ#
public static String toString(int algorithm){ 9o-!ecx}
return name[algorithm-1]; x}tKewdOSe
} <jbj/Q )"
Wgxn`6
public static void sort(int[] data, int algorithm) { /Zo~1q
impl[algorithm-1].sort(data); z>4D~HX
} W8f`J2^"M
BJ~ivT<
public static interface Sort { {5T0RL{\N
public void sort(int[] data); 9*#$0Y=
} G1}~.%J
1#grB(p?
public static void swap(int[] data, int i, int j) { x!'7yx
int temp = data; hVMYB_<~
data = data[j]; X?tj$
data[j] = temp; o_iEkn
} pG/ NuImA
} yh S#&)O