[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; 2Q`@lTUv
} _4iTP$7[
int i1=l; %-!ruc"}
int i2=mid+1; TSXa#SKp
for(int cur=l;cur<=r;cur++){ e0%?;w-TL
if(i1==mid+1) _Z'j%/-4@D
data[cur]=temp[i2++]; })O^xF~
else if(i2>r) W!pLk/|ls
data[cur]=temp[i1++]; <Y9vc:S
else if(temp[i1] data[cur]=temp[i1++]; w4U]lg<}E
else 7Wb:^.d g
data[cur]=temp[i2++]; ,Ju f
} qepsR/0M
} l$D]*_ jc,
Mp*")N,
} kRs(A~ngc
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改进后的归并排序: :Xc%_&)
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package org.rut.util.algorithm.support; =s`\W7/;{-
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import org.rut.util.algorithm.SortUtil; 59gt#1k
jPg8>Z&D
/** w(pLU$6X
* @author treeroot |LA./%U
* @since 2006-2-2 xoI;s}*E
* @version 1.0 XYIZ^_My
*/ 4*W ??(=j
public class ImprovedMergeSort implements SortUtil.Sort { Y<M,/Y_ !
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private static final int THRESHOLD = 10; a9PSg/p
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/* =,&PD(.
* (non-Javadoc) sh(G{Yz@
* $},Y)"mI
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 5qtZ`1Hq
*/ PeGL Rbx34
public void sort(int[] data) { CrC1&F\dq
int[] temp=new int[data.length]; [<P(S~J
mergeSort(data,temp,0,data.length-1); }N^.4HOS8
} P.mz$M
o@j]yA.5)
private void mergeSort(int[] data, int[] temp, int l, int r) { %[0V>
int i, j, k; so}(*E&(a
int mid = (l + r) / 2; ocBfs^ aW
if (l == r) %cMX]U
return; FOiwB^$>
if ((mid - l) >= THRESHOLD) =4cK9ac
mergeSort(data, temp, l, mid); ;n_|t/=
else :GXiA
insertSort(data, l, mid - l + 1); f.acH]p
if ((r - mid) > THRESHOLD) LcS\#p#s]
mergeSort(data, temp, mid + 1, r); ei)ljvvmHP
else Br.$:g#
insertSort(data, mid + 1, r - mid); eAN]*:]g
NfizX!w&
for (i = l; i <= mid; i++) { TUoEk
temp = data; <6g{vNA
} p\OUxAm
for (j = 1; j <= r - mid; j++) { c?B@XIl
temp[r - j + 1] = data[j + mid]; O?e38(
} eS(\E0%QI
int a = temp[l]; Ag=>F5
int b = temp[r]; /NfuR$oMd
for (i = l, j = r, k = l; k <= r; k++) { +-YMW;5
if (a < b) { ek!x:G$'
data[k] = temp[i++]; 8&?Kg>M
a = temp; *YmR7g|k
} else { y}5V3)P
data[k] = temp[j--]; 6lw)L
b = temp[j]; 6L[Yn?;
} \M0-$&[+Z
} 8qGK"%{ ~
} L+,p#w
/f_w@TR\{
/** ^\=<geEj
* @param data ) =-$>75Z
* @param l t}L kl(
* @param i 4FURm@C6
*/ Nn<TPT[,
private void insertSort(int[] data, int start, int len) { wdg,dk9e$
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); Q\.~cIw_AQ
} x`n$4a'7b
} "SC}C
} xR;>n[6
} D^qto{!
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堆排序： aphfzo
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package org.rut.util.algorithm.support; ^o&3+s}M
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import org.rut.util.algorithm.SortUtil; q6DuLFatc*
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/** 7\x7ySM
* @author treeroot ZlQ@k{Es~
* @since 2006-2-2 ;f,`T
* @version 1.0 Xc"l')1H
*/ w#|uR^~
public class HeapSort implements SortUtil.Sort{ }ie O
~D# -i >Z
/* (non-Javadoc) fA"N5qQI(
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) n;&08M5an}
*/ v2=Iqo
public void sort(int[] data) { /}+VH_N1
MaxHeap h=new MaxHeap(); ~[n]la
h.init(data); dH:z_$Mg
for(int i=0;i h.remove(); 5cj]Y)I-~
System.arraycopy(h.queue,1,data,0,data.length); S -$ L2N
} $ 9bIUJ
%oPW`r
private static class MaxHeap{ m?3!
0u[Vd:()v(
void init(int[] data){ c;siMWw;
this.queue=new int[data.length+1]; &b :u~puM
for(int i=0;i queue[++size]=data; JX4uH>6
fixUp(size); <ZmC8&Uo
} }!_x\eq^
} Jr|"QRC
~,#zdm1r@
private int size=0; l0Rjq*5hJ
y04md A6<
private int[] queue; ~N "rr.w
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public int get() { &1nZ%J9
return queue[1]; z+3GzDLy
} HURrk~[
iCd$gwA>F
public void remove() { Pwc)u&
SortUtil.swap(queue,1,size--); GD(gm,,)
fixDown(1); z =mDd
} KX8$j$yW
file://fixdown FPAy.cljJ
private void fixDown(int k) { `FS)i7-o6
int j; ?\Fo|__
while ((j = k << 1) <= size) { yFt$L'#
if (j < size %26amp;%26amp; queue[j] j++; )?_x$GKY
if (queue[k]>queue[j]) file://不用交换 `D *U@iJ
break; _8zZ.~)
SortUtil.swap(queue,j,k); T}fH
k = j; Nf@-i`
} dKk\"6 o
} *=G~26*!V
private void fixUp(int k) { wWq(|"
while (k > 1) { jLc"1+
int j = k >> 1; &Bn> YFu
if (queue[j]>queue[k]) + t%[$"$
break; @34Z/%A
SortUtil.swap(queue,j,k); !+bLhW`
k = j; m.:2G
} h\qQ%|X
} Cu2eMUGt
qH1k
} a4a/]q4T
<]:X
} ,[gu7z^|
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SortUtil： ?HD eiJkX
!u)>XS^E
package org.rut.util.algorithm; KImBQ2^Tu
K!AW8FnHkZ
import org.rut.util.algorithm.support.BubbleSort; +-%&,>R
import org.rut.util.algorithm.support.HeapSort; ;i;2cq
import org.rut.util.algorithm.support.ImprovedMergeSort; ucP"<,a
import org.rut.util.algorithm.support.ImprovedQuickSort; <H; z4
import org.rut.util.algorithm.support.InsertSort; b\{34z,
import org.rut.util.algorithm.support.MergeSort; =`&7pYd,
import org.rut.util.algorithm.support.QuickSort; fRcs@yZnS
import org.rut.util.algorithm.support.SelectionSort; f&=WgITa
import org.rut.util.algorithm.support.ShellSort; ZnrsJ1f:
p?@R0]
/** &-5`Oln
* @author treeroot *s=jKV#
* @since 2006-2-2 G 51l_
* @version 1.0 XIep3l*
*/ eT!*_.' e
public class SortUtil { DHI%R<
public final static int INSERT = 1; N*^iOm]Y
public final static int BUBBLE = 2; ?$chO|QY
public final static int SELECTION = 3; zcqv0lM '
public final static int SHELL = 4; [ GcH4E9r
public final static int QUICK = 5; (ncm]W
public final static int IMPROVED_QUICK = 6; jH5VrN*Q
public final static int MERGE = 7; ^<$$h
public final static int IMPROVED_MERGE = 8; s(2/]f$
public final static int HEAP = 9; vHydqFi9
6H]rO3[8
public static void sort(int[] data) { (u_?#PjX
sort(data, IMPROVED_QUICK); \]:}lVtxS
} Z91{*?
private static String[] name={ L- '{
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" k vuSE
}; pqT+lai)#
]3KMFV}
private static Sort[] impl=new Sort[]{ hRU5CH/!
new InsertSort(), R>C^duos.
new BubbleSort(), <2.87:
new SelectionSort(), DqH?:`G
new ShellSort(), d*B^pDf
new QuickSort(), *UerLpf
new ImprovedQuickSort(), W{El^')F
new MergeSort(), ^Rpy5/d
new ImprovedMergeSort(), 4uX|2nJ2!;
new HeapSort() 8\lRP,-
}; mJ #|~I*Z-
/#FU"
public static String toString(int algorithm){ NMy+=GZu^
return name[algorithm-1]; HL`=zB%
} dvc=<!"'S
vvi[+$M
public static void sort(int[] data, int algorithm) { @$*LU:[
impl[algorithm-1].sort(data); &s{" Vc9]
} yIq. m=
|T;]%<O3E
public static interface Sort { Au\j6mB
public void sort(int[] data); =xs"<Q*w>
} S- N [
/0_^Z2
public static void swap(int[] data, int i, int j) { xHpB/P~
int temp = data; ahUc;S:v#
data = data[j]; v'e5j``=
data[j] = temp; 63NhD
} ):L ; P)
} AY(z9&;6