[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; M\BRcz
} 0g8NHkM:2a
int i1=l; y:uE3Apm
int i2=mid+1; gB33?
for(int cur=l;cur<=r;cur++){ +NUG
if(i1==mid+1) X&H"51
data[cur]=temp[i2++]; eHUOU>&P]
else if(i2>r) K[YyBEid
data[cur]=temp[i1++]; f!X[c?Xy"
else if(temp[i1] data[cur]=temp[i1++]; !4+<<(B=E
else 1'Dai`
data[cur]=temp[i2++]; p!%pP}I
} G3T]`Atf
} -QNh
~k5W@`"W
} JxU5 fe
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改进后的归并排序: [$UI8tV
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package org.rut.util.algorithm.support; X:{!n({r=
@H8EWTZ
import org.rut.util.algorithm.SortUtil; seJ^s@H5l
{'H(g[k
/** \ Cj7k^
* @author treeroot mt.))#1
* @since 2006-2-2 Y'X%Aw;`
* @version 1.0 HGg@ _9tW
*/ >H,*H;6
public class ImprovedMergeSort implements SortUtil.Sort { BiBOr}ZQ
^-'fW7[m
private static final int THRESHOLD = 10; _yR^*}xJb
e*1_8I#2
/* R4d=S4i
* (non-Javadoc) Tlr v={
* Xch~ 1K
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) .=; ;
*/ `Pnoxm'
public void sort(int[] data) { ~gt@P
int[] temp=new int[data.length]; dj%!I:Q>u
mergeSort(data,temp,0,data.length-1); @C aG9]
} A3*!"3nU
%;!.n{X
private void mergeSort(int[] data, int[] temp, int l, int r) { TA~{1_l
int i, j, k; `Q,H|hp;k;
int mid = (l + r) / 2; *VN6cSq
if (l == r) a8Wwq?@
return; aw>#P
if ((mid - l) >= THRESHOLD) }Y4qS
mergeSort(data, temp, l, mid); 8q7b_Pq1U
else 3G4-^hY<
insertSort(data, l, mid - l + 1); c:.eGH_f
if ((r - mid) > THRESHOLD) ?Mfw]z"\C)
mergeSort(data, temp, mid + 1, r); |4`{]2C
else 93hxSRw
insertSort(data, mid + 1, r - mid); ,2ar7 5Va
1h5 Akq
for (i = l; i <= mid; i++) { C7AUsYM
temp = data; }(u ol
} 9N3eN
for (j = 1; j <= r - mid; j++) { gQ.Sa j $
temp[r - j + 1] = data[j + mid]; FVBYo%Ap
} x,Vr=FB
int a = temp[l]; kU`r)=1"
int b = temp[r]; 2J;g{95z
for (i = l, j = r, k = l; k <= r; k++) { U m+8"W
if (a < b) { P0b7S'a4!
data[k] = temp[i++]; $ME)#(
a = temp; !|>"o7
} else { 0m ? )ROaJ
data[k] = temp[j--]; ~Cjn7
b = temp[j]; a[TMDU;(/4
} T[j,UkgGo
} ml$o5&sN
} k VQ\1!
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/** vfo~27T{(
* @param data rVsJ`+L
* @param l Af{"pzY
* @param i KK &?gTa
*/ 0ZO2#>gh$
private void insertSort(int[] data, int start, int len) { @=kSo -SX
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); `P ,d$H "
} PFK '$
} |^H5^k "Bv
} ;*&-C9b
} Wv/=O}
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堆排序： >F&47Yn
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package org.rut.util.algorithm.support; )\^-2[;
pD]OT-8
import org.rut.util.algorithm.SortUtil; X\F|Tk3_
5/z/>D;
/** =nHgDrA_
* @author treeroot `y* }lg T
* @since 2006-2-2 t&DEb_"De
* @version 1.0 jF*j0PkNdb
*/ 29q _BR *:
public class HeapSort implements SortUtil.Sort{ ~F7gP{r
iG?[<1~
/* (non-Javadoc) C"enpc_C/
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 3oG,E;(
*/ >yh2Lri
public void sort(int[] data) { tklH@'q
MaxHeap h=new MaxHeap(); \D&KC,i5f
h.init(data); /H+a0`/
for(int i=0;i h.remove(); 7v_8_K
System.arraycopy(h.queue,1,data,0,data.length); M& CqSd
} \5cpFj5%
n{SJ_S#a.a
private static class MaxHeap{ ;6hOx(>`=
Dn}Jxu'(
void init(int[] data){ 2dgd~
this.queue=new int[data.length+1]; !5?<% *
for(int i=0;i queue[++size]=data; =E{`^IT'R
fixUp(size); da~],MN
} 3{(/x1a,4
} &YeA:i?
NW)1#]gg%
private int size=0; gv{ >`AN
j1HW._G
private int[] queue; /|#fejPh
W|(1Y D
public int get() { Vs{|xG7WD
return queue[1]; e(8Ba X_
} /JU.?M35
Oz#{S:24M+
public void remove() { d*Fj3Wkx
SortUtil.swap(queue,1,size--); Q)z8PQl O
fixDown(1); sFTy(A/
} xi;`ecqS<
file://fixdown RY*U"G0#w
private void fixDown(int k) { 5i{j' {_(8
int j; EDs\,f}
while ((j = k << 1) <= size) { _t}WsEQ+P
if (j < size %26amp;%26amp; queue[j] j++; B48={
if (queue[k]>queue[j]) file://不用交换 $ o#V#
break; 8SS|a
SortUtil.swap(queue,j,k); h3@v+Z<}
k = j; HiJE}V;Vq
} $7A8/#
} 7i1q wRv
private void fixUp(int k) { J!7MZLb
while (k > 1) { |IUWF%~^$+
int j = k >> 1; U|j`e5)
if (queue[j]>queue[k]) "8zDbdK
break; 5.J.RE"M
SortUtil.swap(queue,j,k); w^0nqh
k = j; K,:N
} 63x?MY6
} '>C5-R:O
iMRwp+$
} Ok\7y-w^
[;myHI`tw
} Nu~lsWyRI5
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SortUtil： =zs`#-^8
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package org.rut.util.algorithm; j^2j&Ta
v1,oilL
import org.rut.util.algorithm.support.BubbleSort; gr-OHeid
import org.rut.util.algorithm.support.HeapSort; @49S`
import org.rut.util.algorithm.support.ImprovedMergeSort; 0Pi:N{x8
import org.rut.util.algorithm.support.ImprovedQuickSort; &~U ]~;@
import org.rut.util.algorithm.support.InsertSort; .Rf_Cl
import org.rut.util.algorithm.support.MergeSort; "`1bA"E
import org.rut.util.algorithm.support.QuickSort; }?v )N).kW
import org.rut.util.algorithm.support.SelectionSort; Z>#i**
import org.rut.util.algorithm.support.ShellSort; 2Q:+_v
m/EFHS49
/** 4#hSJ(~7S
* @author treeroot cDkf qcC
* @since 2006-2-2 dzrio-QU~
* @version 1.0 r^ ZEImjc
*/ D=&Me=$
public class SortUtil { K8Y=S12Ti
public final static int INSERT = 1; mBON$sF|
public final static int BUBBLE = 2; b<gr@WF
public final static int SELECTION = 3; >!)DM]Ri
public final static int SHELL = 4; Jma1N;d
public final static int QUICK = 5; P\)iZiGc
public final static int IMPROVED_QUICK = 6; l_%6
public final static int MERGE = 7; g_COp"!~9
public final static int IMPROVED_MERGE = 8; }txX;"/
public final static int HEAP = 9; Aj]V`B:65
FH+s s!
public static void sort(int[] data) { \v)+.m?n
sort(data, IMPROVED_QUICK); gCY';\f!
} v0jgki4t
private static String[] name={ ] {HI?V
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" kt$jm)UI~l
}; XACm[NY_
]-QA'Lq
private static Sort[] impl=new Sort[]{ ,:\|7F
new InsertSort(), TT3|/zwn
new BubbleSort(), G+|` 2an
new SelectionSort(), y7Df_|Z
new ShellSort(), fkNbS
new QuickSort(), KRDmY+
new ImprovedQuickSort(), m$T-s|SY
new MergeSort(), &H:(z4/
new ImprovedMergeSort(), 3n}?bY8@5_
new HeapSort() Bh]P{H%
}; '$zIbQ:
RQu(Wu|m.
public static String toString(int algorithm){ $[=%R`~w
return name[algorithm-1]; J!U}iD@occ
} S\!ana])
!H>R%g#28_
public static void sort(int[] data, int algorithm) { M?uC%x+S$_
impl[algorithm-1].sort(data); xAMW-eF?d
} AX/m25x
w!clI8v/
public static interface Sort { ZSd4z:/
public void sort(int[] data); Pce;r*9
} ,^f+^^
$aXer:
public static void swap(int[] data, int i, int j) { U2s /2 [.
int temp = data; Dy8r 9
data = data[j]; }s<4{:cv+
data[j] = temp; :T !'N\7
} L AAHEv
} oj_3ZsO