[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; xXyzzr1[
} a @TAUJ,
int i1=l; W58\V
int i2=mid+1; - BocWq\
for(int cur=l;cur<=r;cur++){ zL>nDnL 4
if(i1==mid+1) S#ven&
data[cur]=temp[i2++]; [,fMh $t
else if(i2>r) PPmZ[N9(;
data[cur]=temp[i1++]; $y`|zK|G-
else if(temp[i1] data[cur]=temp[i1++]; sGzd c
else +]AE}UXZoh
data[cur]=temp[i2++]; aUJ&
} 6bU/IVP
} Pl 5+Oo
m2 OP=z@)
} {wd.aUB
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改进后的归并排序: WLizgVM
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package org.rut.util.algorithm.support; T9(~^}_+9
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import org.rut.util.algorithm.SortUtil; =JEnK_@?K\
&yYK%~}t[
/** AJq'~fC;I
* @author treeroot (3_2h4O
* @since 2006-2-2 esxU44
* @version 1.0 ofN|%g /
*/ !5[?n3
public class ImprovedMergeSort implements SortUtil.Sort { X3q'x}{
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private static final int THRESHOLD = 10; jd~r~.y
VCh%v-/
/* :JPI#zZun
* (non-Javadoc) hNP|
* %(n4`@
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 8;+t.{
*/ l%;)0gT
public void sort(int[] data) { #p\sw
int[] temp=new int[data.length]; 20hE)!A
mergeSort(data,temp,0,data.length-1); kigc+R
} G*Qk9bk9
0Wk}d(f
private void mergeSort(int[] data, int[] temp, int l, int r) { ?2Bp^3ytJ
int i, j, k; Oq|pd7fcgm
int mid = (l + r) / 2; '"=C^f
if (l == r) Km-lWreTH
return; oz@yF)/Sm
if ((mid - l) >= THRESHOLD) L(}T-.,Slr
mergeSort(data, temp, l, mid); Nnx"b 5I}n
else u\>Ed9^
insertSort(data, l, mid - l + 1); {iHC;a5gb$
if ((r - mid) > THRESHOLD) -rU *)0PR
mergeSort(data, temp, mid + 1, r); |L0s
else 3wa }p^
insertSort(data, mid + 1, r - mid); u9'4q<>&
Jw9|I)H
for (i = l; i <= mid; i++) { 6\'v_A O
temp = data; (\M&/X~q
} C9({7[k^%
for (j = 1; j <= r - mid; j++) { 3"&6rdF\jB
temp[r - j + 1] = data[j + mid]; `/0X].s#o
} \'j%q\Bl;
int a = temp[l]; Z'!jZF~4p
int b = temp[r]; [bE9Y;
for (i = l, j = r, k = l; k <= r; k++) { ~9 K4]5K-
if (a < b) { `P"-9Ue=
data[k] = temp[i++]; Zj!S('hSY
a = temp; (;cbgHo%}
} else { Fb[<YX"
data[k] = temp[j--]; u'LA%l-
b = temp[j]; c~z{/L
} \tU91VIj
} ${mHbqN
} l$MX\
T3!l{vG \O
/** ~99Ta]U
* @param data L}x"U9'C
* @param l sd.:PE <
* @param i 9A)(K,
*/ W<k) '|
private void insertSort(int[] data, int start, int len) { Q]7r?nEEhW
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); Z}$.Tm
} X1y1
} 0;r+E*`DA
} b8Y1.y"#
} lbTz
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堆排序： y7$e7~}/
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package org.rut.util.algorithm.support; t9W_ [_a9
&2#<6=}
import org.rut.util.algorithm.SortUtil; $OmcEd
`{8Sr)
/** cfa#a!Y4
* @author treeroot h"M}Iz~|V?
* @since 2006-2-2 ?Tt/,Hl?D
* @version 1.0 4|7L26,]5
*/ {_KuztJGA
public class HeapSort implements SortUtil.Sort{ (Q\QZu@
{Km|SG[-q
/* (non-Javadoc) l,-smK69
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) "kVN|Do
*/ Xq+7l5LP
public void sort(int[] data) { 'xvV;bi
MaxHeap h=new MaxHeap(); |&h!#Q{7l
h.init(data); "EQ}xj
for(int i=0;i h.remove(); !W{|7Es?.
System.arraycopy(h.queue,1,data,0,data.length); cSoZq4
} \d]&}`'4{f
fh:=ja?bM3
private static class MaxHeap{ ^4c2}>f
uA*Op45
void init(int[] data){ o!wz:|\S
this.queue=new int[data.length+1]; SL>>]A,E<`
for(int i=0;i queue[++size]=data; !fyE Hk
fixUp(size); 82efqzT
} l?Bv9k.^?
} hDjsGB|Fz
.ikFqZ$$
private int size=0; ^kt#[N
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private int[] queue; >2Z:=HT
VDCrFZ!]
public int get() { eNi.d;8F
return queue[1]; s[8<@I*u
} ,t(y~Z wJ
x{5I
public void remove() { ,r:. 3.
SortUtil.swap(queue,1,size--); RR*z3i`PP
fixDown(1); ,`S"nq
} `61VP-r
file://fixdown !>
private void fixDown(int k) { / QSK$ZDC
int j; J:5%ff~r\
while ((j = k << 1) <= size) { VL7zU->
if (j < size %26amp;%26amp; queue[j] j++; kG@1jMPtQ
if (queue[k]>queue[j]) file://不用交换 f*bs{H'5
break; )TVyRYZ1
SortUtil.swap(queue,j,k); Bn-%).-ED
k = j; #0hX)7(j
} D@7\Fg
} i,$*+2Z
private void fixUp(int k) { po\QMe
while (k > 1) { GriL< =?t
int j = k >> 1; P_lk40X
if (queue[j]>queue[k]) fW <qp
break; wNcf7/ky
SortUtil.swap(queue,j,k); q J@XVN4
k = j; %(,JBa:G
} Go+f0aig
} 57%:0loW
UXR$7<D+
} C(xdiQJh
DLJu%5F
} /c]I|$v
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SortUtil： A ElNf:
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package org.rut.util.algorithm; KR?-<
@]gP"Pp
import org.rut.util.algorithm.support.BubbleSort; dHg[0Br)r
import org.rut.util.algorithm.support.HeapSort; *^}(LoPZ
import org.rut.util.algorithm.support.ImprovedMergeSort; `:R8~>p
import org.rut.util.algorithm.support.ImprovedQuickSort; ]@C&Q,~q
import org.rut.util.algorithm.support.InsertSort; !1-:1Whz8
import org.rut.util.algorithm.support.MergeSort; )Uo)3FAn
import org.rut.util.algorithm.support.QuickSort; }gGcYRT
import org.rut.util.algorithm.support.SelectionSort; GbBcC#0
import org.rut.util.algorithm.support.ShellSort; _~-VH&g0R
|r%6;8A]i
/** =Pd3SC})6V
* @author treeroot .ie\3q)
* @since 2006-2-2 " q0lh
* @version 1.0 4$@5PS#,
*/ ?R#-gvX%
public class SortUtil { (wo.OH
public final static int INSERT = 1; CRw.UC\
public final static int BUBBLE = 2; l)4KX{Rz{A
public final static int SELECTION = 3; PL%U
public final static int SHELL = 4; /!P,o}l7
public final static int QUICK = 5; tF O27z@
public final static int IMPROVED_QUICK = 6; ?qO_t;:0>
public final static int MERGE = 7; G ZDyw9
public final static int IMPROVED_MERGE = 8; Nw/4z$].J
public final static int HEAP = 9; hDSt6O4za
UQ}[2x(Kb
public static void sort(int[] data) { J)"2^?!&B
sort(data, IMPROVED_QUICK); 9NBFG~)|l[
} qm{(.b^
private static String[] name={ to|O]h2*U2
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" [?Cv^t${+
}; v1oq[+
!NuiVC]
private static Sort[] impl=new Sort[]{ nxS|]
new InsertSort(), X6)-1.T&
new BubbleSort(), P\pHos
new SelectionSort(), $^?Mip
new ShellSort(), HQCxO?
new QuickSort(), qRZv[T%*Q
new ImprovedQuickSort(), bC{}&a
new MergeSort(), FAX|.!US*p
new ImprovedMergeSort(), A,Wwt [Qw
new HeapSort() 3X=9$xw_
}; Ub2t7MU
o^&u?F9
public static String toString(int algorithm){ iyKAw
return name[algorithm-1]; 'y[74?1
} ^a^bsKW
sC1Mwx
public static void sort(int[] data, int algorithm) { Q,9"/@:c,
impl[algorithm-1].sort(data); LmWZ43Z"@
} Yd'Fhvo8
=PYfk6j9
public static interface Sort { ZP~Mgz{f
public void sort(int[] data); X'Q?Mh
} iO 9.SF0:
U*(/eEtd-
public static void swap(int[] data, int i, int j) { &W+lwEu
int temp = data; 1yC_/Va1
data = data[j]; )O\w'|$G
data[j] = temp; @6h,#8#
} =1sGT;>
} ~tx|C3A`d