[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 }fq
} t(*n[7e
int i1=l; 6Oy:5Ps8a
int i2=mid+1; (X"5x]7]
for(int cur=l;cur<=r;cur++){ P knOeW"j
if(i1==mid+1) X|hYZR
data[cur]=temp[i2++]; G`0O5G:1
else if(i2>r) <9fXf*
data[cur]=temp[i1++]; AEyD?^?
else if(temp[i1] data[cur]=temp[i1++]; iiq `:G
else :wIA.1bK}
data[cur]=temp[i2++]; tz;o6,eb
} F7JO/U^oU
} 6L8nw+mEK
:;eOhZ=_
} 9S]pC?N]E
U U_0@V<
改进后的归并排序: ^vd$j-kjTP
LvG$J*
package org.rut.util.algorithm.support; }=bzUA`C
Ly2,*\7
import org.rut.util.algorithm.SortUtil; Y0,{fw<
1sj7]G]`k
/** $mM"C+dD
* @author treeroot nb/q!8
* @since 2006-2-2 #0<pRDXj
* @version 1.0 2PSExK57
*/ '/HShS!d
public class ImprovedMergeSort implements SortUtil.Sort { L1RD`qXu.
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private static final int THRESHOLD = 10; YM_[
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/* fW2NYQP$:
* (non-Javadoc) x!GDS>
* g3kbsi7_:
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Gpxp8[ {
*/ Q"FN"uQ}x
public void sort(int[] data) { ivo><"Y(r
int[] temp=new int[data.length]; IwnDG;+Ap
mergeSort(data,temp,0,data.length-1); S,:!H@~B
} 0<`qz |_h
}XBF#BN
private void mergeSort(int[] data, int[] temp, int l, int r) { cF15Mm2
int i, j, k; I*a@_EO
int mid = (l + r) / 2; TzaeE
if (l == r) p+=zl`\=|
return; =A6*;T"W
if ((mid - l) >= THRESHOLD) kQ\ $0=6N9
mergeSort(data, temp, l, mid); q$"u<
else i_*yS+Z;
insertSort(data, l, mid - l + 1); )'n@A%B
if ((r - mid) > THRESHOLD) rogy`mh\r2
mergeSort(data, temp, mid + 1, r); 5"nq h}5
else vOlfyH>
insertSort(data, mid + 1, r - mid); 4utwcXL
$||WI}k3V
for (i = l; i <= mid; i++) { p4z4[=-:
temp = data; *]yrN`
} ?+hEs =Xs
for (j = 1; j <= r - mid; j++) { 4Y59^
temp[r - j + 1] = data[j + mid]; g$GGo[_0
} :} =lE"2
int a = temp[l]; O/#3QK
int b = temp[r]; 9~~NxWY%x
for (i = l, j = r, k = l; k <= r; k++) { 1<m`38'
if (a < b) { L-?ty@-i
data[k] = temp[i++]; x*z&#[(0g!
a = temp; Jt]RU+TB
} else { QYo04`Rl
data[k] = temp[j--]; :& Dv!z
b = temp[j]; kfas4mkc
} *.nSv@F
} p}pRf@(`\
} .S,E=
kNWTM%u9
/** 'M6+(`x
* @param data bI0xI[#Q
* @param l }F{s\qUt
* @param i Ox J0."
*/ IWv5UmjN
private void insertSort(int[] data, int start, int len) { #w|v.35%?
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); eowwN>-2C
} vE(]!CB
} 7#j.yf4
} 7 w,D2T
} k ?KJ8
=|AYT6z,
堆排序： }d}sC\>U
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package org.rut.util.algorithm.support; [#Apd1S_
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import org.rut.util.algorithm.SortUtil; Rnwm6nu
(Nc~l ^a
/** Vc5>I_
* @author treeroot P0>2}/;o
* @since 2006-2-2 +:^l|6%}
* @version 1.0 'v<v6vs
*/ tUH?N/qn
public class HeapSort implements SortUtil.Sort{ \VhG'd3k
|qe;+)0>K
/* (non-Javadoc) _(g0$vRP~
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) \}h
*/ L<=Dl
public void sort(int[] data) { A3tv'-e9
MaxHeap h=new MaxHeap(); yC$m(Y12FN
h.init(data); QSF0?Puf
for(int i=0;i h.remove(); rtAPkXJFM
System.arraycopy(h.queue,1,data,0,data.length); >(P(!^[f
} lv/im/]v
RYCiO,+
private static class MaxHeap{ j17h_ a;
`Ns@W?
void init(int[] data){ !{+CzUo@
this.queue=new int[data.length+1]; 'MW%\W;
for(int i=0;i queue[++size]=data; M *w{PjU
fixUp(size); ( gg )?
} AJB NM
} sm'_0EUg
E`_T_O=P
private int size=0; B /uaRi%
%C`P7&8m=O
private int[] queue; P`@Rt
]:LlOv$
public int get() { A{;"e^a-^l
return queue[1]; z<9C-
} *;}xg{@
D*2*FDGI
public void remove() { 5QK%BiDlr
SortUtil.swap(queue,1,size--); J/P[9m30[
fixDown(1); "|I.j)
} $=diG
file://fixdown "9'3mmZm=?
private void fixDown(int k) { N{bg-%s10i
int j; KE"6I
while ((j = k << 1) <= size) { Hre&a!U
if (j < size %26amp;%26amp; queue[j] j++; AJ6l#j-
if (queue[k]>queue[j]) file://不用交换 Kw"e4 a
break; rzHBop-8
SortUtil.swap(queue,j,k); N9|J\;fzT
k = j; .?s jr4
} o@gceZuk
} Tk[]l7R~
private void fixUp(int k) { (bv{17K
while (k > 1) { &c!6e<o[p
int j = k >> 1; vC>2%Zgf-
if (queue[j]>queue[k]) W7A!QS
break; Ox#vW6;)
SortUtil.swap(queue,j,k); uQc("F
k = j; F-zIzzb&O
} h[qZM
} ?7wcv$K5
-V;Y4,:c
} ox`Zs2-a
ppn 8
} Wap4:wT
{.kIC@^O
SortUtil： }Fu1Y@M%
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package org.rut.util.algorithm; ]/Nt
v@Eb[7Kq/1
import org.rut.util.algorithm.support.BubbleSort; 6M&ajl`o
import org.rut.util.algorithm.support.HeapSort; PEEaNOk 1b
import org.rut.util.algorithm.support.ImprovedMergeSort; %XN;S29d5W
import org.rut.util.algorithm.support.ImprovedQuickSort; -h7ssf'u[
import org.rut.util.algorithm.support.InsertSort; ]QR]#[Tn'
import org.rut.util.algorithm.support.MergeSort; QAx9W%
import org.rut.util.algorithm.support.QuickSort; xP~GpVhLF
import org.rut.util.algorithm.support.SelectionSort; hd'fWFWN
import org.rut.util.algorithm.support.ShellSort; *~ IHVU
a]fFR~OY
/** OEl;R7aOB&
* @author treeroot ?xUl_
* @since 2006-2-2 )t+pwh!8
* @version 1.0 kOo Vqu
*/ T8\@CV!
public class SortUtil { mK$E&,OkA
public final static int INSERT = 1; _4) t
public final static int BUBBLE = 2; KRlJKd{
public final static int SELECTION = 3; kJ"rRsK
public final static int SHELL = 4; 1@{ov!YB]
public final static int QUICK = 5; d+)LK~
public final static int IMPROVED_QUICK = 6; ~l:Cj*6x8
public final static int MERGE = 7; ssQ1u.x9
public final static int IMPROVED_MERGE = 8; ^A&{g.0
public final static int HEAP = 9; (*r2bm2FPO
]T/%Bau
public static void sort(int[] data) { yLLA:5Q1
sort(data, IMPROVED_QUICK); U@).jpN
} _ZavY<6
private static String[] name={ !I1p`_(_7
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" =7TWzUCO#
}; Trh t2Iv
(BtU\f#d
private static Sort[] impl=new Sort[]{ eCKm4l'BZ
new InsertSort(), Eh;Ia6}
new BubbleSort(), $:5h5Y#z
new SelectionSort(), V0m1>{
new ShellSort(), wuY-f4
new QuickSort(), :_i1gY)
new ImprovedQuickSort(), 5P #._Em
new MergeSort(), T_2'=7
new ImprovedMergeSort(), yn ofDGAf
new HeapSort() uY)4y0
}; 7Fpa%N/WL
EwG+' nlE
public static String toString(int algorithm){ ?MSZO]Q4+
return name[algorithm-1]; [V_mF
} /Z*$k{qIR&
X~m57bj
public static void sort(int[] data, int algorithm) { :CM-I_6
impl[algorithm-1].sort(data); 9$v\D3<Z
} *-]k([wV
i| cA)
public static interface Sort { |%8t.Z
public void sort(int[] data); vh"';L_*37
} #]+BIr`
_5n2'\] H`
public static void swap(int[] data, int i, int j) { FEhBhv|m
int temp = data; rMWvW(@@D
data = data[j]; o/,%rA4
data[j] = temp; 74 ptd,
} 0P$19TN
} <hy!B4