[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; asN }
} $>ZP%~O
int i1=l; s.^9HuM
int i2=mid+1; #2R%H.*t
for(int cur=l;cur<=r;cur++){ \41)0,sEy
if(i1==mid+1) 1DLG]-j}
data[cur]=temp[i2++]; K6{bYho
else if(i2>r) 4ylDD|) rO
data[cur]=temp[i1++]; AY'?Xt
else if(temp[i1] data[cur]=temp[i1++]; `m3QT3B
else +^DRto=
data[cur]=temp[i2++]; +1Rrkok
} eSX[J6
} !x$:8R
`XSc >
} Lp`<L-s
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改进后的归并排序: plx/}ah8
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package org.rut.util.algorithm.support; M"5!s,
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import org.rut.util.algorithm.SortUtil; =ym
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/** aaz"`,7_
* @author treeroot +'['HQ)
* @since 2006-2-2 |@ZqwC=
* @version 1.0 2PR7M.V7
*/ >mFX^t_,
public class ImprovedMergeSort implements SortUtil.Sort { x`+ l#
AuDR |;i
private static final int THRESHOLD = 10; w"a 9'r
L;S*.Ol>
/* HIX=MprL<
* (non-Javadoc) qE`:b0FT
* gJPDNZ*6pk
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) mvTyx7h=
*/ PM-PP8h
public void sort(int[] data) { Q6.*"`
int[] temp=new int[data.length]; qTTn51
mergeSort(data,temp,0,data.length-1); 9R@abm,I
} ~+<xFi
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private void mergeSort(int[] data, int[] temp, int l, int r) { `xX4!^0Hm
int i, j, k; Xvu)
int mid = (l + r) / 2; P 0Efh?oZ
if (l == r) Y$x"4=~
return; R] Disljq
if ((mid - l) >= THRESHOLD) "VDk1YX_&l
mergeSort(data, temp, l, mid); G&@-R{i
else I[=Wmxa?r
insertSort(data, l, mid - l + 1); nGx ~)T
if ((r - mid) > THRESHOLD) 9eGCBVW:*
mergeSort(data, temp, mid + 1, r); ?UZ$bz
else :_^0'ULP
insertSort(data, mid + 1, r - mid); cK|rrwa0
wrQydI
for (i = l; i <= mid; i++) { R2N^'
temp = data; 13.{Y)
} bk7^%O>
for (j = 1; j <= r - mid; j++) { &gWMl`3^*!
temp[r - j + 1] = data[j + mid]; @TA8^ND
} JN&MyA"
int a = temp[l]; m)@Q_{=6M
int b = temp[r]; Mr=}B6`
for (i = l, j = r, k = l; k <= r; k++) { K5!";V
if (a < b) { 3s?v(1 {)
data[k] = temp[i++]; _b0S
a = temp; m|[\F#+C
} else { nY{i>Y
data[k] = temp[j--]; NokXE
b = temp[j]; U~{Sa+
} gb=80s0
} YER:ICQ
} ZI58XS+
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/** wi\z>'R
* @param data Y_[g_
* @param l 068WlF cWV
* @param i y _'eyR@)
*/ C~ZE95g
private void insertSort(int[] data, int start, int len) { 3VcT7y*{P
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); 'bB>$E
} Mx/h?}u;
} $yDW.pt
} |.b%rVu
} rDIhpT)a
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堆排序： Z!wD~C"D73
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package org.rut.util.algorithm.support; |h^K M
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import org.rut.util.algorithm.SortUtil; v78&[
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/** |x d@M-ln
* @author treeroot j:HH#U
* @since 2006-2-2 A$7Eo`Of
* @version 1.0 7<EJo$-j
*/ fd?bU|I_2
public class HeapSort implements SortUtil.Sort{ h'B9|Cm
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/* (non-Javadoc) #04{(G|~+E
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ,'FD}yw4v
*/ G%2P
public void sort(int[] data) { _qY`KP"
MaxHeap h=new MaxHeap(); z@!^ow)`J
h.init(data); Y*Y&)k6t
for(int i=0;i h.remove(); lq1[r~
System.arraycopy(h.queue,1,data,0,data.length); WYSck&9
} J3H.%m!V
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private static class MaxHeap{ t-!Rgg$9
Z,0O/RFJ.q
void init(int[] data){ /K_ i8!y
this.queue=new int[data.length+1]; \HCOR, `T
for(int i=0;i queue[++size]=data; r~)VGdB+
fixUp(size); UG6M9
} xe(MHNrj
} so}l#
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private int size=0; {V[Ha~b%*
;US83%*
private int[] queue; dKU5;
cICHRp&&
public int get() { S\B5&W
return queue[1]; S&n[4*
} q z=yMIy=
b![t6-f^z
public void remove() { U8YO0}_z
SortUtil.swap(queue,1,size--); NtHbwU,
fixDown(1); kfVZ=`p}
} 0;vtdM[_
file://fixdown )nhfkW=e
private void fixDown(int k) { 6yN" l Q7
int j; %h0D)6j
while ((j = k << 1) <= size) { Am#m>^!qb
if (j < size %26amp;%26amp; queue[j] j++; BpH|/7
if (queue[k]>queue[j]) file://不用交换 e:qo_eSC^-
break; 0HjJaML
SortUtil.swap(queue,j,k); ab{;Z5O
k = j; !{IC[g n
} jUYF.K&
} YjFWC!Qj$
private void fixUp(int k) { =]T|h
while (k > 1) { [d0%.+U
int j = k >> 1; b 1cd&e
if (queue[j]>queue[k]) V{KjRSVf=
break; O8gfiQqF&
SortUtil.swap(queue,j,k); 1x{XE*%;
k = j; Mz93
} ?;Un#6b
} =Qyqfy*@D?
R3$@N
} .Nc_n5D6
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} ,`<]>;s
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SortUtil： NNgK:YibD
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package org.rut.util.algorithm; $;y1Qiel
~fBex_.o*
import org.rut.util.algorithm.support.BubbleSort; gTnS[
import org.rut.util.algorithm.support.HeapSort; Ex6o=D2
import org.rut.util.algorithm.support.ImprovedMergeSort; @2u#93Y
import org.rut.util.algorithm.support.ImprovedQuickSort; D{>\-]\
import org.rut.util.algorithm.support.InsertSort; N50fL
import org.rut.util.algorithm.support.MergeSort; E$w#+.QP
import org.rut.util.algorithm.support.QuickSort; z=B< `}@3
import org.rut.util.algorithm.support.SelectionSort; 3i6h"Wu`n
import org.rut.util.algorithm.support.ShellSort; \OP9_J(*
_y>}#6B
/** 'v\j.j/i
* @author treeroot F%}7cm2
* @since 2006-2-2 \Y9I~8\gB
* @version 1.0 vuZf#\zh}
*/ Ym'7vW#~
public class SortUtil { {b2 aL7
public final static int INSERT = 1; p(.N(c
public final static int BUBBLE = 2; )'`CC>Q
public final static int SELECTION = 3; |!oXvXU
public final static int SHELL = 4; lO[E[c G
public final static int QUICK = 5; q4)Ey
public final static int IMPROVED_QUICK = 6; $}db /hY*
public final static int MERGE = 7; 9T$u+GX'
public final static int IMPROVED_MERGE = 8; V#NtBreN
public final static int HEAP = 9; ER_ 3'
b)Tl*
public static void sort(int[] data) { >zFD$
sort(data, IMPROVED_QUICK); B_cgWJ*4
} :Z[(A"dA
private static String[] name={ ~U9q-/(J/
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" 4Ppop
}; &;s<dDQK
SAy{YOLtl
private static Sort[] impl=new Sort[]{ s047"Q
new InsertSort(), LaclC]yLU
new BubbleSort(), %uua_&#)
new SelectionSort(), hD*(AJ
new ShellSort(), &5d\~{;
new QuickSort(), /w0w*nH
new ImprovedQuickSort(), ,aWCiu}
new MergeSort(), T~h.=5
new ImprovedMergeSort(), t?HF-zQ
new HeapSort() #v+;:
}; k&!6fZ)
$7Cgo&J
public static String toString(int algorithm){ {U^j&E
return name[algorithm-1]; <W2ZoqaV
} xdqK.Z%
7C?E z%a@
public static void sort(int[] data, int algorithm) { Tv1]v.
impl[algorithm-1].sort(data); ;5N41_hG
} ^;4YZwW5w
a5)JkC
public static interface Sort { 1U'ZVJ5bpK
public void sort(int[] data); fq=:h\\G
} \qB6TiB/
~@@ Z|w
public static void swap(int[] data, int i, int j) { W6i3Psjsw
int temp = data; qW3x{L$c
data = data[j]; me:iQ.g
data[j] = temp; \+9;!VWhl
} JL``iA
} c@9##DPn