[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<UZ\d -
} y*vs}G'W
int i1=l; &=<x&4H+
int i2=mid+1; E2LpQNvN%g
for(int cur=l;cur<=r;cur++){ db@i*Bf
if(i1==mid+1) T.`EDluG
data[cur]=temp[i2++]; .N5}JUj
else if(i2>r) 5``/exG>
data[cur]=temp[i1++]; ,Tvk&<!0
else if(temp[i1] data[cur]=temp[i1++]; Dx4?6
else *-3K],^a
data[cur]=temp[i2++]; }/SbmW8(1
} a7%5Qg9B;
} nP0|nPWz#
O<Ht-TN&
} ou6yi; l%
@4sv(HyDY
改进后的归并排序: uPr@xff
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package org.rut.util.algorithm.support; P`@d8%*;
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import org.rut.util.algorithm.SortUtil; (}V.xi
(Z,v)TOXjV
/** w;&J._J
* @author treeroot k9~NIvnB`
* @since 2006-2-2 !L2R0Y:a
* @version 1.0 L1VUfEG-
*/ Ha[Bf*
public class ImprovedMergeSort implements SortUtil.Sort { brl(7_2
r0+lH:G*q
private static final int THRESHOLD = 10; g`d5OHvOo
; "ux{ .
/* 0x4Xs
* (non-Javadoc) l"W9uS;\T
* }/4 AT
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 3 i Id>
*/ Dwj!B;AZ_
public void sort(int[] data) { Xjw>Qws
int[] temp=new int[data.length]; /a[i:Oa#
mergeSort(data,temp,0,data.length-1); g"EvMv&
} fFMGpibkM
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private void mergeSort(int[] data, int[] temp, int l, int r) { =ps3=D
int i, j, k; 9.{u2a\
int mid = (l + r) / 2; }3E@]"<cVR
if (l == r) MCZTeYnx
return; !g #
if ((mid - l) >= THRESHOLD) Q>8F&p?R
mergeSort(data, temp, l, mid); "9'~6b
else GbUw:I
insertSort(data, l, mid - l + 1); 5Ev9u),D+v
if ((r - mid) > THRESHOLD) ]JVs/
mergeSort(data, temp, mid + 1, r); H!?Av$h`
else d&BocJ
insertSort(data, mid + 1, r - mid); JR8 b[Oj.S
k|k
for (i = l; i <= mid; i++) { wzVx16Rvc
temp = data; :hJHjh
} /{>$E>N;
for (j = 1; j <= r - mid; j++) { Ls< ";QJc
temp[r - j + 1] = data[j + mid]; G0oY`WXOB
} *1"xvle
int a = temp[l]; K+ZJSfO6
int b = temp[r]; dw#K!,g
for (i = l, j = r, k = l; k <= r; k++) { }Qyuy~-&^
if (a < b) { ~P8 6=Vw
data[k] = temp[i++]; ^,*ED Yz
a = temp; `Fnl<C<
} else { !~Gx@Ro
data[k] = temp[j--]; :)o 4fOJ8
b = temp[j]; " !F)K
} s~ ||Vv!
} me:~q#k
} K2$ fKju
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/** GKT2x '(e
* @param data _&V%idz!0
* @param l yHhx- `
* @param i .1n=&d|
*/ R= ,jqW<
private void insertSort(int[] data, int start, int len) { Z6s-n$dSm
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); w0qrh\3du
} `EKmp|B_p_
} R=&9M4
} p7et>;WRx
} =1Nz* c
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堆排序： Dl=9<:6FW
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package org.rut.util.algorithm.support; 4<V%7z_.B
tfB}U.
import org.rut.util.algorithm.SortUtil; :rxS&5
I(^pIe-
/** 7egE."
* @author treeroot mJ+M|#Ox
* @since 2006-2-2 T_t5Tg~i[N
* @version 1.0 7LEB,bU
*/ C,;T/9
public class HeapSort implements SortUtil.Sort{ pK`1pfih
I0iTa99K
/* (non-Javadoc) ga?:k,xv
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) f(M$m,d
*/ J?6.yL;
public void sort(int[] data) { 7Qdf#DG
MaxHeap h=new MaxHeap(); U ?iw
h.init(data); OlU')0Y
for(int i=0;i h.remove(); ->Z9j(JU
System.arraycopy(h.queue,1,data,0,data.length); \c')9g@
} 8^IV`P~2M
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private static class MaxHeap{ l7h6R$7; 0
vEy0DHEE
void init(int[] data){ 8F>u6Y[P
this.queue=new int[data.length+1]; R*[X. H
for(int i=0;i queue[++size]=data; j_I[k8z
fixUp(size); In[rxT~K}Q
} mpr_AL!ZO~
} epicY
}b5omHUE%
private int size=0; 1Kjqs)p^
]I,(^Xq3a(
private int[] queue; V0)bPcS/
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public int get() { Vc[aNpE
return queue[1]; r'J="^k{
} ZLjEH7
SFu]*II;{
public void remove() { FR9w0{o
SortUtil.swap(queue,1,size--); HNJR&U t
fixDown(1); gmUXh;aHc
} V` T l$EF
file://fixdown c,2OICj
private void fixDown(int k) { tJG+k)EE
int j; |,bP`Z
while ((j = k << 1) <= size) { 3S5`I9I
if (j < size %26amp;%26amp; queue[j] j++; gt(^9t;
if (queue[k]>queue[j]) file://不用交换 (ZPl~ZO
break; |}7!'f\M
SortUtil.swap(queue,j,k); lw]uH<v
k = j; ^B_SAZ&%%
} I4|LD/b
} M7[GwA[Z +
private void fixUp(int k) { )3IUKz%\6p
while (k > 1) { ;J@U){R
int j = k >> 1; ZaBmH|k
if (queue[j]>queue[k]) tj?%{L
break; vbD""
SortUtil.swap(queue,j,k); jY2mn".N
k = j; _1?nLx7n
} Z%Pv,h'Q
} qyBC1an5,
~.tl7wKkR/
} s{Og3qUy
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} fikDpR
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SortUtil： J(G-c5&=
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package org.rut.util.algorithm; uHsLlfTn
74 WKy
import org.rut.util.algorithm.support.BubbleSort; d8uDSy
import org.rut.util.algorithm.support.HeapSort; .Y|wG<E
import org.rut.util.algorithm.support.ImprovedMergeSort; C hQ] d
import org.rut.util.algorithm.support.ImprovedQuickSort; TI}a$I*
import org.rut.util.algorithm.support.InsertSort; cyLl,OA
import org.rut.util.algorithm.support.MergeSort; (wFoI}s
import org.rut.util.algorithm.support.QuickSort; ^AShy`o^X
import org.rut.util.algorithm.support.SelectionSort; oiIl\#C
import org.rut.util.algorithm.support.ShellSort; ny%$BQM=
9Trk&OB
/** 7|o!v);uR
* @author treeroot (Hmm^MV)
* @since 2006-2-2 .EPv4[2%F8
* @version 1.0 &"?99E>
*/ =it@U/
public class SortUtil { jXVvVv
public final static int INSERT = 1; ]bAVOKm-
public final static int BUBBLE = 2; =]5f\f6
public final static int SELECTION = 3; +J85Re `
public final static int SHELL = 4; 5A$,'%d
public final static int QUICK = 5; t 9t '9
public final static int IMPROVED_QUICK = 6; :.tL~% q
public final static int MERGE = 7; c5|sda{
public final static int IMPROVED_MERGE = 8; vsyg u
public final static int HEAP = 9; HYmUD74FR
5*f54g"'
public static void sort(int[] data) { L }3eZ-
sort(data, IMPROVED_QUICK); @ze2'56F}
} @}19:A<'
private static String[] name={ !-N!Bt8;
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" qe'ssX;
}; )7]yzc
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private static Sort[] impl=new Sort[]{ m?; ?I]`
new InsertSort(), kxN O9w
new BubbleSort(), Ozhn`9L+1!
new SelectionSort(), 6" <(M@
new ShellSort(), ]DU?N7J
new QuickSort(), ML MetRP
new ImprovedQuickSort(), yoJ.[M4q
new MergeSort(), @e&0Wk
new ImprovedMergeSort(), vBJxhK-
new HeapSort() 7R7+jL,
}; \m~p;B
Z:<an+v|5
public static String toString(int algorithm){ c{dabzLy
return name[algorithm-1]; n((A:b
} /M::x+/T
A^p{Cq@E
public static void sort(int[] data, int algorithm) { 9gdK&/ulR
impl[algorithm-1].sort(data); \{]y(GT
} (5E09K$
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public static interface Sort { _9t1aP5
public void sort(int[] data); XXhN;-p
} 83I 5n&)
t$~'$kM)<
public static void swap(int[] data, int i, int j) { jI0gf&v8
int temp = data; ?]D))_|G
data = data[j]; P$0c{B4I
data[j] = temp; iF Mf[qBg
} $/|) ,n
} "oNl!<ep