[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; ['DYP-1J
} hpOK9
int i1=l; 5fuYva >Ik
int i2=mid+1; Zd~Q@+sH
for(int cur=l;cur<=r;cur++){ UYkuz
if(i1==mid+1) ~^v*f
data[cur]=temp[i2++]; E-L>.tD
else if(i2>r) Gi Max
data[cur]=temp[i1++]; w|( ix;pK
else if(temp[i1] data[cur]=temp[i1++]; iXD=_^^o .
else :IRQouTf:,
data[cur]=temp[i2++]; <ql:n
} k!ac_}&NNv
} I7?s+vyds
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} QB6. o6
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改进后的归并排序: >e^8fpgSo
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package org.rut.util.algorithm.support; N7#,x9+E
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import org.rut.util.algorithm.SortUtil; jM;?);Dd
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/** Z1sRLkR^
* @author treeroot 2O " ~k
* @since 2006-2-2 9ve)+Lk
* @version 1.0 <59G
*/ 1)!?,O\ey
public class ImprovedMergeSort implements SortUtil.Sort { c'uDK>
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private static final int THRESHOLD = 10; *ez7Q
Qo])A6$IU
/* 9B2`FJ
* (non-Javadoc) 7-2,|(Xg
* Ep8 y
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) g7O, <
*/ *(j-jbA
public void sort(int[] data) { "xp>Vj
int[] temp=new int[data.length]; != u S
mergeSort(data,temp,0,data.length-1); j\TS:F^z
} e|Mw9DIW
cPg$*,]
private void mergeSort(int[] data, int[] temp, int l, int r) { m}GEx)Y D
int i, j, k; {z*`* O@
int mid = (l + r) / 2; vlx\hJ<I
if (l == r) z[*Y%o8-r
return; 6d%)MEM
if ((mid - l) >= THRESHOLD) `!7QegJa"
mergeSort(data, temp, l, mid); $[g8j`or!
else apd"p{
insertSort(data, l, mid - l + 1); .MI 5?]_
if ((r - mid) > THRESHOLD) mFJb9,
mergeSort(data, temp, mid + 1, r); nWsR;~pK
else u\P)x~-TM
insertSort(data, mid + 1, r - mid); k{ibD5B
@W\H%VR
for (i = l; i <= mid; i++) { 9Lqo^+0)\
temp = data; ZA8FX
} T[]kun
for (j = 1; j <= r - mid; j++) { "MU)8$d
temp[r - j + 1] = data[j + mid]; *kKdL
} i=j4Wg,{J
int a = temp[l]; SCKpW#2dP{
int b = temp[r]; 6uubkt
for (i = l, j = r, k = l; k <= r; k++) { ~R\U1XXyUY
if (a < b) { ]_&pIBp
data[k] = temp[i++]; rKr2 K'
a = temp; l527>7 eT
} else { 5H |<h
data[k] = temp[j--]; 8`;3`lZ
b = temp[j]; WDQw)EUl&
} v m)'CC
} 31n|ScXv
} fqS cf}s
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/** B)L;ja
* @param data R;Gf3K
* @param l qD/FxR-!
* @param i E?3$ *t
*/ B(U0 ~{7a
private void insertSort(int[] data, int start, int len) { U&<w{cuA
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); nO7#m~
} et0yS%7+?@
} ?jRyw(Q
} 'ktWKW$ D
} }c-tvK1g
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堆排序： HRZ3}8Qj
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package org.rut.util.algorithm.support; UONW3}-
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import org.rut.util.algorithm.SortUtil; -(YdK8
=D6H?K-k!
/** O`W&`B(*k
* @author treeroot WmT(>JBO
* @since 2006-2-2 J>Uzd, /
* @version 1.0 ;Z(~;D
*/ fG\]&LFBU
public class HeapSort implements SortUtil.Sort{ 0kB!EJ<OdG
K;_.WzWD=
/* (non-Javadoc) 3U73_=>=&
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) (" +/ :
*/ $6]7>:8mz
public void sort(int[] data) { C5jR||
MaxHeap h=new MaxHeap(); >f*[U/{ K
h.init(data); 4?a!6
for(int i=0;i h.remove(); :,^pLAt
System.arraycopy(h.queue,1,data,0,data.length); ^"d!(npw
} Aa;s.:?
g)Byd\DS
private static class MaxHeap{ jW-j+WGSM
\Ow-o0
void init(int[] data){ .h8%zB#|i
this.queue=new int[data.length+1]; L('G1J}
for(int i=0;i queue[++size]=data; "wPFQXU
fixUp(size); OgTE^W@
} buhn~ c
} 6QOdd6_d
;=.QT
private int size=0; >Rbgg1^]5
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private int[] queue; [[PUK{P0
G'<J8;B* t
public int get() { |WB<yA1
return queue[1]; rwlV\BU
} 1;l&ck-Gg/
!(hP{k ^g
public void remove() { :I5]|pt
SortUtil.swap(queue,1,size--); 6SMGXy*]^
fixDown(1); *My?l75
} O\T
file://fixdown pX]*&[X?
private void fixDown(int k) { =$g8"[4
int j; w49Wl>M
while ((j = k << 1) <= size) { d{f3R8~Q.
if (j < size %26amp;%26amp; queue[j] j++; 9Osjh G
if (queue[k]>queue[j]) file://不用交换 $;_'5`xs
break; Tv0|e'^
SortUtil.swap(queue,j,k); PiZt?r?5w|
k = j; sa`7_KB
} 2FO.!m
} EvMhNq~y5
private void fixUp(int k) { X9nt;A2TU+
while (k > 1) { ` BH8v
int j = k >> 1; i_4FxC4
if (queue[j]>queue[k]) Etj*3/n|
break; ^6+P&MxM
SortUtil.swap(queue,j,k); 'jeGERMr'
k = j; y'Xg"
} Um\Nd#=:
} j?6%=KuX<
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} A0M)*9 f
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} V5K!u8T
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SortUtil： q+t*3;X.
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package org.rut.util.algorithm; Mno4z/4{A
E'$r#k:o
import org.rut.util.algorithm.support.BubbleSort; pr/yDGia
import org.rut.util.algorithm.support.HeapSort; El0|.dW
import org.rut.util.algorithm.support.ImprovedMergeSort; GS~jNZx
import org.rut.util.algorithm.support.ImprovedQuickSort; &^1DNpUZ
import org.rut.util.algorithm.support.InsertSort; hH{&k>
import org.rut.util.algorithm.support.MergeSort; VbK| VON[
import org.rut.util.algorithm.support.QuickSort; g`gH]W FcG
import org.rut.util.algorithm.support.SelectionSort; B4GgR,P@S
import org.rut.util.algorithm.support.ShellSort; w*Sl
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/** LKxyj@Eq
* @author treeroot c^UG}:Y
* @since 2006-2-2 rayC1#f
* @version 1.0 \x)T_]Gcm
*/ ;-@^G 3C:
public class SortUtil { KCDEMs}}zM
public final static int INSERT = 1; //>f#8Ho
public final static int BUBBLE = 2; 6I72;e^!
public final static int SELECTION = 3; 0NZg[>H
public final static int SHELL = 4; e!ar:>T
public final static int QUICK = 5; ,#UaWq@7
public final static int IMPROVED_QUICK = 6; ed2QGTgR
public final static int MERGE = 7; U9IN#;W
public final static int IMPROVED_MERGE = 8; 0~R0)Q,
public final static int HEAP = 9; 5X nA.?F^
xg/3*rL
public static void sort(int[] data) { L=VJl[DL
sort(data, IMPROVED_QUICK); 1N1MD@C?P
} %gJf&A
private static String[] name={ PE|_V
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" =5oE|F%
}; 'F?T4
@ bPQhn#(g
private static Sort[] impl=new Sort[]{ 7z)Hq./3@
new InsertSort(), {b"V7vn,
new BubbleSort(), bwqla43gX
new SelectionSort(), :7<spd(%"
new ShellSort(), g03I<<|@
new QuickSort(), =" #O1$
new ImprovedQuickSort(), ; ob>$ _
new MergeSort(), 8{8J(~
new ImprovedMergeSort(), ux& WN ,
new HeapSort() sikG}p0mx<
}; CQW#o_\
|#LU"D
public static String toString(int algorithm){ R^<li;Km
return name[algorithm-1]; Z[RE|l{
} 6x^#|;e>lI
(g`G(K_
public static void sort(int[] data, int algorithm) { 3u^U\xB
impl[algorithm-1].sort(data); 0+}42g|_Z
} UIi;&[
<[@AMdS
public static interface Sort { 3E$M{l
public void sort(int[] data); <xKer<D %
} B+#!%J_
B<u6Z!Pp2
public static void swap(int[] data, int i, int j) { zp:kdN7!^
int temp = data; -hiG8%l5
data = data[j]; (, /`*GC
data[j] = temp; @#hd8_)A.
} y4PR&^l?g
} V##=-KZ