[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; `<R;^qCt
} wk @-O}W
int i1=l; eK]g FXk
int i2=mid+1; M#v#3:&5
for(int cur=l;cur<=r;cur++){ gcLwQ-
if(i1==mid+1) MDETAd
data[cur]=temp[i2++]; \)H}
else if(i2>r) NpS*]vSO
data[cur]=temp[i1++]; +<cvyg5U
else if(temp[i1] data[cur]=temp[i1++]; t{)Z$)'
else 9rhIDA(wc
data[cur]=temp[i2++]; N^,@s"g
} kz4d"bTb
} Be?b| G!M
jpND"`Q
} J LOTl.
V=#L@ws
改进后的归并排序: v9Kx`{1L
'2`MT-
package org.rut.util.algorithm.support; Y6LoPJ
?~G D^F
import org.rut.util.algorithm.SortUtil; X6_m&~}15
UdBP2lGd
/** \9[_*
* @author treeroot Ie3 F
* @since 2006-2-2 H)XHlO^
* @version 1.0 45cMG~]p
*/ f<!3vAh
public class ImprovedMergeSort implements SortUtil.Sort { fBgW0o.Bu
^T}6oUd
private static final int THRESHOLD = 10; &zVF!xNy&
8u+FWbOl]
/* B o@B9/ABv
* (non-Javadoc) }1EfyR
* UzLe#3MU
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) JzhbuWwF-
*/ :Ja]Vt
public void sort(int[] data) { z$'_ =9yZ
int[] temp=new int[data.length]; " oWiQ{\IP
mergeSort(data,temp,0,data.length-1); <28L\pdG`
} }%j@%Ep[
gQpF(P
private void mergeSort(int[] data, int[] temp, int l, int r) { eUiJl6^x
int i, j, k; )ZkQWiP-
int mid = (l + r) / 2; ["'0vQ
if (l == r) M,0@@:
return; $@8$_g|Wz
if ((mid - l) >= THRESHOLD) Ift @/A
mergeSort(data, temp, l, mid); YXD6GJWo
else 3$YgGum
insertSort(data, l, mid - l + 1); %m\dNUz4g
if ((r - mid) > THRESHOLD) eK }AVz}k
mergeSort(data, temp, mid + 1, r); &<{=
else etY/K0
insertSort(data, mid + 1, r - mid); {?-@`FR-
.SdHFWx
for (i = l; i <= mid; i++) { H^Th]-Zl
temp = data; 2LpJxV
} ZzDE
for (j = 1; j <= r - mid; j++) { 7C7eXJ9q
temp[r - j + 1] = data[j + mid]; {~=Edf
} )"j)9RQ}
int a = temp[l]; fX)C8J^=G
int b = temp[r]; >eHSbQu/Bu
for (i = l, j = r, k = l; k <= r; k++) { zE"ME*ou
if (a < b) { qPgLSZv
data[k] = temp[i++]; 9S"c-"y\#
a = temp; h> K~<BAz'
} else { IvLo&6swW
data[k] = temp[j--]; -Fcg}\9
b = temp[j]; ^X$k<nA;
} igNZe."V
} 2i+'?.P
} &<</[h/B/F
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/** EC6&#)g;CO
* @param data Lb# e
* @param l #&+0hS
* @param i {Mt4QA5iZ
*/ ;g[C=yhK`C
private void insertSort(int[] data, int start, int len) { ?A|8J5EV
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); n[zP}YRr
} k(Z+(Y'{q~
} /|{Yot e
} y=!"++T]B<
} P19nF[A
E|u#W3-:
堆排序： ~GL"s6C$`;
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package org.rut.util.algorithm.support; %j],6wW5J
L%,tc~)A
import org.rut.util.algorithm.SortUtil; $+` YP
RhM]OJd'
/** !mFx= +
* @author treeroot imcq H
* @since 2006-2-2 cU\Er{ k
* @version 1.0 <{rRcFR
*/ t#s?:
public class HeapSort implements SortUtil.Sort{ Y,O)"6ev
w_30g6tA
/* (non-Javadoc) 7I~Ww{
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) n-m+@jRz
*/ nZ?BCO
public void sort(int[] data) { J 00<NRxj"
MaxHeap h=new MaxHeap(); [zp v3Uw
h.init(data); >*ey 7g
for(int i=0;i h.remove(); k/+-Tq;
System.arraycopy(h.queue,1,data,0,data.length); u|m>h(O
} [n/'JeG5
19od# d3+
private static class MaxHeap{ D3#/*Ky
%JBFG.+
void init(int[] data){ }V.Wp6"S
this.queue=new int[data.length+1]; ZA@QP1
for(int i=0;i queue[++size]=data; j{,3!
fixUp(size); 4am`X1YV#
} 9z9z:PU
} >Lo 0,b$
8>.l4:`
private int size=0; jg8j>"Vj>
*@'4 A :A
private int[] queue; /H+br_D9
b#p)bcz!I
public int get() { B9`^JYT<
return queue[1]; =|IB=
} g+8j$w}
]=v_u9;
public void remove() { mx@F^
SortUtil.swap(queue,1,size--); y=y=W5#;77
fixDown(1); FoM4QO
} *ayn<Vlh`^
file://fixdown mQt';|X@
private void fixDown(int k) { %1ofu,%
int j; h4CDZ
while ((j = k << 1) <= size) { r(`;CY]@
if (j < size %26amp;%26amp; queue[j] j++; (p<QRb:&Z
if (queue[k]>queue[j]) file://不用交换 '| Enc"U
break; c)8V^7=Q
SortUtil.swap(queue,j,k); &0*l=!:G^
k = j; }J}a;P4
} 7 }`c:u~j
} qJQE|VM&
private void fixUp(int k) { |B&KT
while (k > 1) { G5W6P7-<X
int j = k >> 1; UeB8|z
if (queue[j]>queue[k]) Z&W|O>QTl
break; P<b.;Oz__-
SortUtil.swap(queue,j,k); )'8DK$.
k = j; ,)mqd2)+"
} 6|U0"C#]
} dj*%^cI
}IvJIr
} ;\7TQ9z
)&di c6r
} zI/)#^SQ
p2}$S@GD
SortUtil： <,qJ%kc
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package org.rut.util.algorithm; I}/o`oc
Gv[W)+3f
import org.rut.util.algorithm.support.BubbleSort; lyiBRMiP|
import org.rut.util.algorithm.support.HeapSort; $Gb] K{e
import org.rut.util.algorithm.support.ImprovedMergeSort; _+0l+a*D
import org.rut.util.algorithm.support.ImprovedQuickSort; |+Z, 7~!
import org.rut.util.algorithm.support.InsertSort; l c)*HYqU
import org.rut.util.algorithm.support.MergeSort; ^.Cfa
import org.rut.util.algorithm.support.QuickSort; 03?TT,y$
import org.rut.util.algorithm.support.SelectionSort; =jdO2MgSg*
import org.rut.util.algorithm.support.ShellSort; ^,zE Nqg7
qq}EXq^
/** }OO(uC2
* @author treeroot fLK*rK^{"
* @since 2006-2-2 P_+S;(QQ~d
* @version 1.0 A+%oE
*/ F\!;}z
public class SortUtil { =W)Fa6P3j(
public final static int INSERT = 1; ?&Si P-G
public final static int BUBBLE = 2; JDv7jy
public final static int SELECTION = 3; K[RlR+j
public final static int SHELL = 4; xP3_
public final static int QUICK = 5; 3#R~>c2
public final static int IMPROVED_QUICK = 6; @O+yxGA
public final static int MERGE = 7; }h<\qvCcU
public final static int IMPROVED_MERGE = 8; 8[(eV.
public final static int HEAP = 9; E>Ukxi1
)t={+^Xe
public static void sort(int[] data) { kvs^*X''Ep
sort(data, IMPROVED_QUICK); R`ajll1
} =O~1L m;
private static String[] name={ 2%0zPflT
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" v :]y#y
}; 7uJy<O
kXS_:f;M
private static Sort[] impl=new Sort[]{ j>~^jz:
new InsertSort(), uy\<t
new BubbleSort(), T/G1v;]
new SelectionSort(), Mj |)KDL
new ShellSort(), Ixm<wKwW#
new QuickSort(), {:40Jf
new ImprovedQuickSort(), "|RP_v2
new MergeSort(), <4}zl'.
new ImprovedMergeSort(), /b,M492
new HeapSort() `L`*jA+_
}; ghd~p@4
<lZyUd
public static String toString(int algorithm){ AbUPJF"F
return name[algorithm-1]; >FPE%X0+
} |Q:$G!/
XG ]yfux`
public static void sort(int[] data, int algorithm) { +<6L>ZAL
impl[algorithm-1].sort(data); E&V"z^qs_
} ~PaD _W#xP
'qQ 5K o
public static interface Sort { e/lfT?J\
public void sort(int[] data); tu6oa[s
} RL |.y~
9Q-/Yh
public static void swap(int[] data, int i, int j) { 3 D,PbAd
int temp = data; J]i=SX+ 9
data = data[j]; cv;&ff2%?
data[j] = temp; W3*BdpTw
} @B5@3zYs
} [P8Y