[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; n@ lf+
} 3ha^NjE
int i1=l; kx0(v1y3gT
int i2=mid+1; S[(Tpk2_
for(int cur=l;cur<=r;cur++){ Z8*E-y0
if(i1==mid+1) Aon3G
data[cur]=temp[i2++]; ste0:.*qb
else if(i2>r) Jt5\
data[cur]=temp[i1++]; ;+] mcgN!
else if(temp[i1] data[cur]=temp[i1++]; (CFm6p'RZ
else ZN#mu]jC?
data[cur]=temp[i2++]; NovF?kh2
} "/[xak!g
} N|-M|1w96
n4,b?-E>(
} LdnHz#
!qk+>6~A,
改进后的归并排序: K8M[xaI@
F,+nj?i!
package org.rut.util.algorithm.support; vFm8T58 7
'4k l$I
import org.rut.util.algorithm.SortUtil; ]R[j]E.
? cU9~=
/** !m8MyZ}%
* @author treeroot Vc0C@*fVM
* @since 2006-2-2 x9Um4!/t
* @version 1.0 RQhS]y@e
*/ F!.Z@y P
public class ImprovedMergeSort implements SortUtil.Sort { Qc1NLU9:
t4(Z@X$
private static final int THRESHOLD = 10; +*&bgGhT
a!rU+hiC
/* __N< B5E
* (non-Javadoc) J=?`~?Vbo
* f_v@.vnn.
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 1;8=,&
*/ D! TFb E
public void sort(int[] data) { ramYSX@
int[] temp=new int[data.length]; ]S!:p>R
mergeSort(data,temp,0,data.length-1); M ,!Dhuas
} 7L3:d7=MIW
?5'EP|<
private void mergeSort(int[] data, int[] temp, int l, int r) { lz1RAp0R"
int i, j, k; mQ(6ahD U
int mid = (l + r) / 2; ,F}\njL
if (l == r) tDw(k[aK@
return; %S*<2F9
if ((mid - l) >= THRESHOLD) #o`y<1rN
mergeSort(data, temp, l, mid); i2.g}pM.A
else u~b;m
insertSort(data, l, mid - l + 1); oA/[>\y
if ((r - mid) > THRESHOLD) LFvO[&
mergeSort(data, temp, mid + 1, r); v'3.`aZ!
else N8*6sK.
insertSort(data, mid + 1, r - mid); RE)!b
9O(vh(C
for (i = l; i <= mid; i++) { 0Va+l)F
temp = data; 6!F@?3qCyg
} (j<FS>##
for (j = 1; j <= r - mid; j++) { ].ZfTrM]
temp[r - j + 1] = data[j + mid]; >Sc)?[H
} =Q+i(UGHi
int a = temp[l]; Yf1&"WW4
int b = temp[r]; aE aU_f/
for (i = l, j = r, k = l; k <= r; k++) { 'NaNh0y
if (a < b) { zD}@QoB
data[k] = temp[i++]; X=C*PWa7
a = temp; ?XCFRt,ol
} else { \e)>]C}h
data[k] = temp[j--]; gR5 EK$
b = temp[j]; /Z3 Mlm{
} /%&Kbd
} HKB?G~
} au=A+
P"-*'q,9
/** ~l {*XM
* @param data AS1#_fC
* @param l pg<m0g@W*;
* @param i #3VOC#.
*/ ht>C6y
private void insertSort(int[] data, int start, int len) { |:7 ^
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); {"v~1W)
} FZFYwU\~.L
} +"mS<
} l<3X:)
} )NF5,eD
b@v_db]|t.
堆排序： q8Jhs7fv
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package org.rut.util.algorithm.support; bF2RP8?en
?Z^?A^; }$
import org.rut.util.algorithm.SortUtil; ~Un+Zs%24
8Cx6Me>,=
/** lL\%eQ
* @author treeroot >b;o&E`\
* @since 2006-2-2 4*0C_F@RX
* @version 1.0 sA(d_Yu_
*/ KUD.hK.
public class HeapSort implements SortUtil.Sort{ _BFDsQ
WHF[l1
/* (non-Javadoc) MiK -W
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) gDN7ly]6M
*/ cMU"SO
public void sort(int[] data) { lwSZpS
MaxHeap h=new MaxHeap(); }yzCq+
h.init(data); V><,.p8
for(int i=0;i h.remove(); @5RbMf{
System.arraycopy(h.queue,1,data,0,data.length); )tvP|
} :?!b\LJ2^
{<}9r6k;f
private static class MaxHeap{ #Vy8<Vy&w
omP\qOc
void init(int[] data){ @1w[~QlV
this.queue=new int[data.length+1]; ?td`*n~,
for(int i=0;i queue[++size]=data; 8NZQTRdH
fixUp(size); zi^?9n),
} !-veL1r
} @D[tljc^
v:F_!Q
private int size=0; AAXlBY6Y-
fzdWM:g
private int[] queue; eIDrN%3
4j1$1C{
public int get() { #lfW0?Y'
return queue[1]; +dG3/vV
} Hk8lHja+\
$xU)t&Df
public void remove() { En9>onJ
SortUtil.swap(queue,1,size--); `VrQ?s
fixDown(1); {Mpx33
} ;x|7"lE
file://fixdown d=nv61]
private void fixDown(int k) { 9oU1IT9
int j; ,+4*\yI3l
while ((j = k << 1) <= size) { Yycfb
if (j < size %26amp;%26amp; queue[j] j++; V/&JArW
if (queue[k]>queue[j]) file://不用交换 ]*Cq'<h$
break; Lcz`
SortUtil.swap(queue,j,k); oh0*bh
k = j; vbh 5
} 3iIURSG@
} |}o6N5)
private void fixUp(int k) { Pihpo
while (k > 1) { J#DN2y<
int j = k >> 1; H?_wsh4J
if (queue[j]>queue[k]) oLS/
break; [gDl<6a#4
SortUtil.swap(queue,j,k); t-i\gq^
k = j; gX|We}H
} NmA6L+
} |{ @BH
ffQm"s:P
} :+_
eakQZ-Q
} ._q}lWT
h e[2,
SortUtil： /o^/J~/3
6)veuA3]
package org.rut.util.algorithm; /E-sg, k
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import org.rut.util.algorithm.support.BubbleSort; [X 9zrGHt
import org.rut.util.algorithm.support.HeapSort; g/4ipcG;N
import org.rut.util.algorithm.support.ImprovedMergeSort; cN:dy#
import org.rut.util.algorithm.support.ImprovedQuickSort; E*x ct-m#
import org.rut.util.algorithm.support.InsertSort; 74=zLDDS
import org.rut.util.algorithm.support.MergeSort; !C@+CZXLx
import org.rut.util.algorithm.support.QuickSort; 050V-S>s
import org.rut.util.algorithm.support.SelectionSort; kIR/.Ij}
import org.rut.util.algorithm.support.ShellSort; \beYb0(+
VfFbZds8f
/** +~V)&6Vn
* @author treeroot N;v]ypak
* @since 2006-2-2 9>@Vk vpY
* @version 1.0 R2A#2{+H
*/ f~R+Q/Gtz`
public class SortUtil { w! PguP
public final static int INSERT = 1; '!F'B:
public final static int BUBBLE = 2; 6HZVBZhM
public final static int SELECTION = 3; W]5Hc|!^^
public final static int SHELL = 4; w$Z%RF'p
public final static int QUICK = 5; (<}BlL
public final static int IMPROVED_QUICK = 6; L6"V=^Bq
public final static int MERGE = 7; kEp{L
public final static int IMPROVED_MERGE = 8; j[A:So
public final static int HEAP = 9; [:zP]l.|
^'n;W<\p)
public static void sort(int[] data) { Q*hXFayx
sort(data, IMPROVED_QUICK); p^1~o/
} @qSZ=
private static String[] name={ /E!N:g<
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" 7h.fT`
}; J@OK"%12
q8!]x-5$6j
private static Sort[] impl=new Sort[]{ YkbuyUui
new InsertSort(), *c>B-Fo/D
new BubbleSort(), 0YC|;`J
new SelectionSort(), Tol"D2cyf
new ShellSort(), X/_89<&
new QuickSort(), &xpvHKJl
new ImprovedQuickSort(), ,n2"N5{jw
new MergeSort(), WXY-]ir.
new ImprovedMergeSort(), M.HMnN#
new HeapSort() <Uc
}; Iw^Q>MrT
+KaVvf
public static String toString(int algorithm){ h\2iArw8
return name[algorithm-1]; F'-XAI <3
} +sV~#%%
/I((A/ks
public static void sort(int[] data, int algorithm) { yp[,WZt
impl[algorithm-1].sort(data); .%!^L#g
} TT no
kE:{#>[Uz
public static interface Sort { 6a<zZO`Z6+
public void sort(int[] data); 6Jq3l_
} I1#MS4;$^
6FN#Xg
public static void swap(int[] data, int i, int j) { DJ9x?SL@KD
int temp = data; A+j!VM
data = data[j]; B>4/[ YHr;
data[j] = temp; o70] F
} * F_KOf9p
} "jLC!h^N