[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; UBi4itGD
} VqL 5f
int i1=l; 6)U&XWH0
int i2=mid+1; U+"=
for(int cur=l;cur<=r;cur++){ ij i.3-
if(i1==mid+1) =b!J)]
data[cur]=temp[i2++]; yOK])&c
else if(i2>r) !"J#,e|
data[cur]=temp[i1++]; <gdgcvd
else if(temp[i1] data[cur]=temp[i1++]; S8OVG4-
else ^A[`NYK
data[cur]=temp[i2++]; B#6pQp$
} -?nT mzRc
} vNt>ESPB
P"x-7>c>Y
} ZGpTw[5ql
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改进后的归并排序: T#n1@FgC
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package org.rut.util.algorithm.support; e4Ox`gLa*p
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import org.rut.util.algorithm.SortUtil; `f+8WPJPZ
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/** "'!%};
* @author treeroot 9J7J/]7f
* @since 2006-2-2 'n[+r}3
* @version 1.0 W/r mm*
*/ \`/E !ub
public class ImprovedMergeSort implements SortUtil.Sort { ZSRRlkU
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private static final int THRESHOLD = 10; o? i.v0@!K
So=nB} b[?
/* #t@x6Vt
* (non-Javadoc) )J+{oB[>b
* r)p2'+}pV
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) qggk:cN1
*/ QM ZUt
public void sort(int[] data) { 'q92E(
int[] temp=new int[data.length]; {zz6XlKPj
mergeSort(data,temp,0,data.length-1); Hs%QEvZl
} ,|.8nk"
+`*qlP;
private void mergeSort(int[] data, int[] temp, int l, int r) { xegQRc
int i, j, k; V3mjbH>F
int mid = (l + r) / 2; *`ZB+ \*
if (l == r) b0YiQjS6>
return; 1BMB?I
if ((mid - l) >= THRESHOLD) X 45x~8f
mergeSort(data, temp, l, mid); AU)1vx(\w
else +9zJlL^A%
insertSort(data, l, mid - l + 1); vm\wO._
if ((r - mid) > THRESHOLD) /o~qC<7
mergeSort(data, temp, mid + 1, r); .Iwur;/\
else rFmKmV
insertSort(data, mid + 1, r - mid); #zS1Zf^KP
rGnI(m.
for (i = l; i <= mid; i++) { @S}/g/+2
temp = data; o_Jn_3=
} P+dA~2k
for (j = 1; j <= r - mid; j++) { /l,+oG%\
temp[r - j + 1] = data[j + mid]; F qeV3N
} vi]r
int a = temp[l]; d4Co^A&
int b = temp[r]; gA~20LSt
for (i = l, j = r, k = l; k <= r; k++) { YV/>8*i
if (a < b) { erx5j\
data[k] = temp[i++]; R_Zv'y6
a = temp; ?YF${
} else { 0]AN;
data[k] = temp[j--]; k"xGA*B|
b = temp[j]; gi6g"~%@q1
} D \N \BD
} qWsylC23
} /g_9m
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/** NO-k-
* @param data bIgh@= 2
* @param l CSMeSPOm]
* @param i =p<?Hu
*/ !FTNmyM~F
private void insertSort(int[] data, int start, int len) { Qg(Z{V
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); &+ KyPY+
} 00ofHZ
} <W>++< -
} Cye T]y
} TG}d3ZU !
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堆排序： M)&Io6>
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package org.rut.util.algorithm.support; 96d~~2p
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import org.rut.util.algorithm.SortUtil; qO-9 x0v#
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/** +`@M*kd
* @author treeroot 4({(i
* @since 2006-2-2 Ck\7F?S
* @version 1.0 lbQQtpEKO
*/ )qL&%xz
public class HeapSort implements SortUtil.Sort{ ui:=
$B;_Jo\|
/* (non-Javadoc) H~noJIw#
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 8WL8/
*/ S}(8f!9<
public void sort(int[] data) { +TK3{5`!Ae
MaxHeap h=new MaxHeap(); +oI3I~
h.init(data); "wAf.=F
for(int i=0;i h.remove(); "13"`!m
System.arraycopy(h.queue,1,data,0,data.length); +Y}V3(w9X
} Y34/+Fi
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private static class MaxHeap{ F>zl9Vi<
5;\gJf
void init(int[] data){ $=B8qZ+
this.queue=new int[data.length+1]; 9T7e\<8"vC
for(int i=0;i queue[++size]=data; >@_im6
fixUp(size); :IMdN}(L
} o!OMm!
} )[L^Dmd,
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private int size=0; ljC(L/I
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private int[] queue; z0%\OhuCcf
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public int get() { ?YQPlv:<o.
return queue[1]; `Out(Hn
} p8}(kHUp(
foRD{Hx
public void remove() { \3Pv# )
SortUtil.swap(queue,1,size--); SJ?6{2^
fixDown(1); :O-iykXyI
} 7y^%7U \
file://fixdown b|xpNd-
private void fixDown(int k) { ,](:<A)W&
int j; aAE>)#f(
while ((j = k << 1) <= size) { ^T5X)Nu{=C
if (j < size %26amp;%26amp; queue[j] j++; C NsNZJ
if (queue[k]>queue[j]) file://不用交换 |4(~%| 8{
break; NGC,lv
SortUtil.swap(queue,j,k); 0'5/K ,
k = j; K+*Q@R D
} A#8q2n270*
} 1'.7_EQ4T
private void fixUp(int k) { uo\ .7[1
while (k > 1) { hRC
int j = k >> 1; 5xCT~y/a
if (queue[j]>queue[k]) }`(N:p
break; )s_n
SortUtil.swap(queue,j,k); rxnFrx
k = j; H}hFFI)#Oo
} !RB)_7
} 1CU>L[W)
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} fyTAou6hI
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} &QRE"_g
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SortUtil： sUZX }
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package org.rut.util.algorithm; K 0gI):
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import org.rut.util.algorithm.support.BubbleSort; 4iAZ+l5&
import org.rut.util.algorithm.support.HeapSort; !+>v[(OzM
import org.rut.util.algorithm.support.ImprovedMergeSort; F+R?a+e
import org.rut.util.algorithm.support.ImprovedQuickSort; ]]7mlQ
import org.rut.util.algorithm.support.InsertSort; )?+$x[f!*
import org.rut.util.algorithm.support.MergeSort; v+p{|X-
import org.rut.util.algorithm.support.QuickSort; ^b:(jI*l
import org.rut.util.algorithm.support.SelectionSort; rX_@Ihv'
import org.rut.util.algorithm.support.ShellSort; \(226^|j
JB!:JML
/** #^m0aB7r
* @author treeroot R_M?dEtE>
* @since 2006-2-2 7Q\|=$2
* @version 1.0 XE^)VLH:
*/ !.2<| 24
public class SortUtil { fYKOJ5f
public final static int INSERT = 1; coYij
public final static int BUBBLE = 2; 5F`;yh+e
public final static int SELECTION = 3; n]8<DX99Q0
public final static int SHELL = 4; h(WrL
public final static int QUICK = 5; R$;n)_H
public final static int IMPROVED_QUICK = 6; 93t9^9
public final static int MERGE = 7; t78k4?
public final static int IMPROVED_MERGE = 8; &zs'/xv]
public final static int HEAP = 9; 74!oe u.>
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public static void sort(int[] data) { 9x,RvWTb
sort(data, IMPROVED_QUICK); hig2
} +`?Y?L^ J
private static String[] name={ 'SQG>F Uy
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" ECv)v
}; j*~T1i
9UvXC)R1
private static Sort[] impl=new Sort[]{ ~]ZpA-*@Ut
new InsertSort(), %Uz(Vd#K
new BubbleSort(), 2^?:&1:
new SelectionSort(), f/CuE%7BR
new ShellSort(), CI3XzH\IX*
new QuickSort(), B"%{i-v>**
new ImprovedQuickSort(), !^Q.VYY
new MergeSort(), K~ ;45Z2
new ImprovedMergeSort(), 2NB L}x
new HeapSort() hYawU@R
}; ve&zcSeb
ca+[0w@S
public static String toString(int algorithm){ DY[$"8Kxcp
return name[algorithm-1]; DBLO|&2!z[
} ,o]4?-
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public static void sort(int[] data, int algorithm) { =y=cW1TG
impl[algorithm-1].sort(data); j <o3JV
} HF3f)}l$
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public static interface Sort { 5xii(\lC
public void sort(int[] data); EUIIr4]
} 9{:O{nl
Q X%&~
public static void swap(int[] data, int i, int j) { < y*x]}
int temp = data; dx;k`r$w
data = data[j]; VN%INUi@
data[j] = temp; @)K%2Y`
} dg^L=
} .Lfo)?zG