[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; ]z@]Fi33Y
} R|yTUGY
int i1=l; HM x9M$
int i2=mid+1; /;[')RO`
for(int cur=l;cur<=r;cur++){ !2,.C+,
if(i1==mid+1) 3c"{Wu-}
data[cur]=temp[i2++]; v8=MO:>{R
else if(i2>r) E$baQU hKS
data[cur]=temp[i1++]; 4K,&Q/Vdd7
else if(temp[i1] data[cur]=temp[i1++]; SxyFFt
else %|||M=akk
data[cur]=temp[i2++]; 7] H4E.(l
} C_;6-Q%V
} J#^M
3KZ h?~B
} #7)6X:/O
9EQ,|zf'
改进后的归并排序: riQ?'!a7
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package org.rut.util.algorithm.support; z(` kWF1<
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import org.rut.util.algorithm.SortUtil; Ds$;{wl#x
F U%b"gP^
/** |9@;Muq;
* @author treeroot R 1\]Y
* @since 2006-2-2 }'JPA&h|
* @version 1.0 !h;VdCCi#
*/ =!2
public class ImprovedMergeSort implements SortUtil.Sort { D-/A>
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private static final int THRESHOLD = 10; U^S0H(>
n+w>Qz'
/* @B <_h+
* (non-Javadoc) WbF\=;$=7
* Ro69woU
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) C8-q<t#SF
*/ L T!X|O.
public void sort(int[] data) { p^3d1H3
int[] temp=new int[data.length]; 5^i ^?
mergeSort(data,temp,0,data.length-1); P^r8JhDJ
} q1j[eru
Sx7xb]3XI"
private void mergeSort(int[] data, int[] temp, int l, int r) { NH!!.Z"
int i, j, k; 'L7.a'
int mid = (l + r) / 2; @A%`\Ea%
if (l == r) iWEYSi\)n
return; `W=JX2I
if ((mid - l) >= THRESHOLD) eAEVpC2
mergeSort(data, temp, l, mid); UbXz`i
else xC]/i(+bA
insertSort(data, l, mid - l + 1); aeIR}'H|
if ((r - mid) > THRESHOLD) x3 <Lx^;
mergeSort(data, temp, mid + 1, r); RdjUw#\33b
else )eV]M~K:
insertSort(data, mid + 1, r - mid); jA'+>`@
sP#5l @
for (i = l; i <= mid; i++) { *HUqW}_r
temp = data; a'r\e2/e?H
} 2TO1i0
for (j = 1; j <= r - mid; j++) { b(F`$N@7C
temp[r - j + 1] = data[j + mid]; 0!T $Ef
} :/08}!_:
int a = temp[l]; "@_f>3z
int b = temp[r]; ?uLqB@!2
for (i = l, j = r, k = l; k <= r; k++) { v,! u{QP
if (a < b) { 4ai3@f5
data[k] = temp[i++]; G9TUU.T
a = temp; 7UiU3SUcg
} else { K} @q+
data[k] = temp[j--]; {1mD(+pJ{
b = temp[j]; n%}0hVu
} 7>TG ]&
} NUseYU``
} {[eY/)6H
6/)A6Tt
/** Cq=c'(cX
* @param data Yi3DoaS;"
* @param l kBkhuKd)V
* @param i +=QboUN
*/ u&:jQ:[
private void insertSort(int[] data, int start, int len) { c|XnPqo;f
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); E6uIp^E
} .#SWfAb2h
} sj1x>
} (]L=$u4
} xo}hu%XL
+Aq}BjD#
堆排序： te_D ,
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package org.rut.util.algorithm.support; B7 T+a
W#$rC<Jh]
import org.rut.util.algorithm.SortUtil; asb")NfIm
R[6&{&E:
/** &F)lvtt|
* @author treeroot *@< jJP4
* @since 2006-2-2 *Co+UJjT
* @version 1.0 -c. a7
*/ `%VrT`
public class HeapSort implements SortUtil.Sort{ 6mZFsB
.nnAI@7E
/* (non-Javadoc) EJZ2V>\_-0
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Ec|#i
*/ S; >_9
public void sort(int[] data) { IcN|e4t^J+
MaxHeap h=new MaxHeap(); N6eY-`4y
h.init(data); 2gi`^%#k]
for(int i=0;i h.remove(); FTn[$q
System.arraycopy(h.queue,1,data,0,data.length); 3Dy.mtP
} 5,A/6b
"{}5uth
private static class MaxHeap{ 2Ig.hnHj
ZCa?uzeo]
void init(int[] data){ BX?Si1c
this.queue=new int[data.length+1]; z>!b
for(int i=0;i queue[++size]=data; ?%?@?W>s@
fixUp(size); @uHNz-c
} 16AYB17
} /PO5z7n0J
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private int size=0; Q'Q^K
8"? t6Z;5
private int[] queue; %*,'&S
eD(#zfP/+
public int get() { #R &F
return queue[1]; %',. K)IR
} $?7}4u,
\ FA7 +Q
public void remove() { *v6'I-#
SortUtil.swap(queue,1,size--); z}Q54,9m
fixDown(1); 3a =KgOvp
} ^z_~e@U
file://fixdown r__uPyIMG/
private void fixDown(int k) { ?>e-6*.
int j; lUDzfJ}3
while ((j = k << 1) <= size) { 0h* AtZv_
if (j < size %26amp;%26amp; queue[j] j++; <~]s+"oVc
if (queue[k]>queue[j]) file://不用交换 3]T2Zp&;
break; m}k rG
SortUtil.swap(queue,j,k); Rh%x5RFFc
k = j; P*_Q8I)Y
} y'{0|Xj
} 6j0!$q^
private void fixUp(int k) { ;s{rJG{inG
while (k > 1) { P66>w})@
int j = k >> 1; (sZB-
if (queue[j]>queue[k]) yPW?%7 h
break; Rgg(rF=K6
SortUtil.swap(queue,j,k); 4Vh#Ye:`
k = j; `CO?} rW
} f>dWl$/_s
} 7JjTm^bu
mIt=r_
} vU::dr
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} Y~,N,>nITu
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SortUtil： JPRl/P$
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package org.rut.util.algorithm; P)4SrqW_
b:oB $E
import org.rut.util.algorithm.support.BubbleSort; gWRSS=8%
import org.rut.util.algorithm.support.HeapSort; >Qr(#Bt)
import org.rut.util.algorithm.support.ImprovedMergeSort; (Zp'|hx8o
import org.rut.util.algorithm.support.ImprovedQuickSort; |GLa`2q|
import org.rut.util.algorithm.support.InsertSort; y<MXd,eE
import org.rut.util.algorithm.support.MergeSort; oQAD 3a
import org.rut.util.algorithm.support.QuickSort; c&ymVB?G:1
import org.rut.util.algorithm.support.SelectionSort; b8(94t|;U
import org.rut.util.algorithm.support.ShellSort; n"*A.
A\YP}sG1
/** uN2Ck
* @author treeroot ;V@o 2a
* @since 2006-2-2 G7b>r
* @version 1.0 &G:#7HX@-
*/ ;>bcI).
public class SortUtil { /g@!#Dt
public final static int INSERT = 1; id'E_]r
public final static int BUBBLE = 2; _3.=| @L
public final static int SELECTION = 3; ~0eJ6i
public final static int SHELL = 4; *bsS%qD]
public final static int QUICK = 5; (X;D.s
public final static int IMPROVED_QUICK = 6; s:CsUl|
public final static int MERGE = 7; MqRpG5 .
public final static int IMPROVED_MERGE = 8; KFx4"f%
public final static int HEAP = 9; "{Lp'+wNw
Eu2@%2}P
public static void sort(int[] data) { ;.+sz(:hm
sort(data, IMPROVED_QUICK); I'm.+(1m,
} WZ> }
private static String[] name={ Dm2&}{&K
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" w*n@_n={
}; {wVj-w=<W
')zdI]@M
private static Sort[] impl=new Sort[]{ X|++K;rtfE
new InsertSort(), 8tJB/Pw`S
new BubbleSort(), 5=(fuY3
new SelectionSort(), Y {a#2(xn
new ShellSort(), u[k0z!p_ c
new QuickSort(), yL{X}:;}
new ImprovedQuickSort(), (hr*.NS#
new MergeSort(), 9l<f?OzAO
new ImprovedMergeSort(), ~qekM>z
new HeapSort() P :zZ
};
j#6@cO'`
public static String toString(int algorithm){ 2[zFKK
return name[algorithm-1]; 5FKb7
} Z#+lwZD
m`_s_#
public static void sort(int[] data, int algorithm) { h)7hk*I
impl[algorithm-1].sort(data); =MMU(0 E
} /{il;/Vj
dz_~_|
public static interface Sort { h'%iY6!fA
public void sort(int[] data); _[M*o0[@W
} Qu]F<H*Y|
;&=c@>!xP#
public static void swap(int[] data, int i, int j) { vuN!7*d+
int temp = data; :Aq==N_/2
data = data[j]; R<]f[
data[j] = temp; !X5n'1&
} hUR>NUK@8
} w8~B@}%