[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; s6uAF(4,
} Cn '=_1p
int i1=l; U7?ez
int i2=mid+1; HskN(Ho
for(int cur=l;cur<=r;cur++){ eRbO Hj1
if(i1==mid+1) 8?XZF[D
data[cur]=temp[i2++]; X.<R['U&\
else if(i2>r) l[k$O$jo
data[cur]=temp[i1++]; ?Y* PVx9Y
else if(temp[i1] data[cur]=temp[i1++]; YZ@-0_Z
else \f#ao<vQm
data[cur]=temp[i2++]; [%kucGC7
} _TF>c:m3
} lsCh K
gZv<_0N
} Hc9pWr"N
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改进后的归并排序: 9_{!nQC.g
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package org.rut.util.algorithm.support; c2/HY8ttRD
#J_i 5KmXJ
import org.rut.util.algorithm.SortUtil; Gy%e%'
1O4"MeF
/** bk]|C!7$
* @author treeroot ,vPF=wq
* @since 2006-2-2 H;1}Nvvd
* @version 1.0 ;\N*iN#K
*/ $EF@x}h:A
public class ImprovedMergeSort implements SortUtil.Sort { !4:,,!T
oDa{HP\O]W
private static final int THRESHOLD = 10; $}fA;BP
2Fi*)\{
/* ~l~g0J
* (non-Javadoc) u7d]%<~'$F
* {,=,0NQKn
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) `>Cx!sYhV
*/ >^&+,*tsS4
public void sort(int[] data) { KJ_R@,v\
int[] temp=new int[data.length]; l.$#IE
mergeSort(data,temp,0,data.length-1); T!bu}KO
} HJmO+
*bEsWeP
private void mergeSort(int[] data, int[] temp, int l, int r) { r;z A `
int i, j, k; 5,C,q%2
int mid = (l + r) / 2; Df (6DuW
if (l == r) o*_D
return; 5mU_S\)4:z
if ((mid - l) >= THRESHOLD) ^>fs
mergeSort(data, temp, l, mid); "L]_NST
else j7&l&)5
insertSort(data, l, mid - l + 1); @V)WJ{
if ((r - mid) > THRESHOLD) q]x@q
mergeSort(data, temp, mid + 1, r); uc_ X;M;
else MXb(Z9)]kw
insertSort(data, mid + 1, r - mid); |k+^D:
KXJHb{?
for (i = l; i <= mid; i++) { tF|bxXsZ
temp = data; e3K
} bb{+
for (j = 1; j <= r - mid; j++) { RulIzv
temp[r - j + 1] = data[j + mid]; #82B`y<<y/
} (P?9Jct
int a = temp[l]; ry'(mM
int b = temp[r]; Y~Rwsx
for (i = l, j = r, k = l; k <= r; k++) { ]NCOi?Odx
if (a < b) { :"4~VDu
data[k] = temp[i++]; kbY@Y,:w
a = temp; =R05H2hs
} else { W4<}w-AoEp
data[k] = temp[j--]; x+pFu5,
b = temp[j]; < -Nj
} Gkl#s7'
} &kG<LGXP#
} z?PF9QL1
nB.p}k
/** uyj5}F+O
* @param data EO5Vg
* @param l +~-|( y
* @param i F}X_I
*/ D)Zv
private void insertSort(int[] data, int start, int len) { ;>~iCFk]?
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); ^N]*Zf~N?
} gnQd#`
} |s:!LU&OL\
} Sz =z TPnO
} qVfOf\x.e
D<MtLwH
堆排序： \m<*3eS
GB#7w82
package org.rut.util.algorithm.support; O'k"6sBb
Rh=h{O
import org.rut.util.algorithm.SortUtil; :z[SI{Y
s[hD9$VB>
/** q bo`E!K
* @author treeroot m*1=-"P
* @since 2006-2-2 hYLu
* @version 1.0 9I,Trk@&
*/ D3]_AS&\
public class HeapSort implements SortUtil.Sort{ '>Z Ou3>
WDcjj1`l
/* (non-Javadoc) 8W{R&Z7aL
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) O_~\$b
*/ ]]+"`t,-
public void sort(int[] data) { 7j^,4;
MaxHeap h=new MaxHeap(); [8ih-k
h.init(data); Y9ru~&/o$
for(int i=0;i h.remove(); }u :sh >2
System.arraycopy(h.queue,1,data,0,data.length); q N>j2~
} k3&Wv
7>#74oy
private static class MaxHeap{ d2pVO]l YZ
8"+Kz
void init(int[] data){ !^y'G0
this.queue=new int[data.length+1]; *cf#:5Nl
for(int i=0;i queue[++size]=data; p &A3l
fixUp(size); HM`;%0T0(
} O[!]/qP+.
} ig6F!p
uKK+V6}!kj
private int size=0; D_g+O"];P
C&\#{m_1B
private int[] queue; zMtx>VI
2QdqVwm
public int get() { zhS\|tI
return queue[1]; m}rUc29cS,
} uT_bA0jK
`rvS(p[s
public void remove() { @,$>H7o
SortUtil.swap(queue,1,size--); @I9A"4Im
fixDown(1); MFRM M%`
} _G@)Bj^*
file://fixdown L^dF )y?
private void fixDown(int k) { rOX\rI%0+
int j; `j9 ;9^
while ((j = k << 1) <= size) { *4]}_ .rG#
if (j < size %26amp;%26amp; queue[j] j++; X-=49)
if (queue[k]>queue[j]) file://不用交换 nwf(`=TC
break; W2'u]1bs
SortUtil.swap(queue,j,k); /; w(1)B
k = j; =nGgk}Z
} _->d41
} `fS$@{YI_
private void fixUp(int k) { xQ%N% `
while (k > 1) { Dr)B0]KG
int j = k >> 1; Ejmpg_kux
if (queue[j]>queue[k]) @P@?KZ..v!
break; qx|~H'UuBN
SortUtil.swap(queue,j,k); }"Clv/3_
k = j; ~6DaM!
} ,N93H3(
} ew?4;
:<hM@>eFn
} 7_HFQT1.N
zc K`hS
} sFt"2TVr3
9(6f:D
SortUtil： I'}&s|6
Y7BmW+
package org.rut.util.algorithm; @q]4]U)
XlLG/N
import org.rut.util.algorithm.support.BubbleSort; - ({h @
import org.rut.util.algorithm.support.HeapSort; >e>%AMzo[
import org.rut.util.algorithm.support.ImprovedMergeSort; 4( $p8J
import org.rut.util.algorithm.support.ImprovedQuickSort; R#HVrzOO|T
import org.rut.util.algorithm.support.InsertSort; T[Lz4;TRk5
import org.rut.util.algorithm.support.MergeSort; 0RgE~x!hI
import org.rut.util.algorithm.support.QuickSort; KT[ZOtu
import org.rut.util.algorithm.support.SelectionSort; Uo?4o*}
import org.rut.util.algorithm.support.ShellSort; xqs ,4bcbY
U$|q]N
/** ^hNl6)hR
* @author treeroot 0 30LT$&!
* @since 2006-2-2 \#4mPk_"
* @version 1.0 'Fy"|M;2
*/ 1*" 7q9x
public class SortUtil { #N"m[$;QR
public final static int INSERT = 1; /yHjds
public final static int BUBBLE = 2; 3^[P
public final static int SELECTION = 3; Bv<aB(c
public final static int SHELL = 4; oqAO@<dL!
public final static int QUICK = 5; _K}q%In
public final static int IMPROVED_QUICK = 6; s]]lB018O\
public final static int MERGE = 7; DkX^b:D*f
public final static int IMPROVED_MERGE = 8; zOd*>
public final static int HEAP = 9; URceq2_
`;Ho<26
public static void sort(int[] data) { D=Q.Q
sort(data, IMPROVED_QUICK); 4GbfA .u
} 9u^M{6
private static String[] name={ "4\k1H"_
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" {CV+1kz
}; /{f"0]-RA
q8_(P&
private static Sort[] impl=new Sort[]{ !m^;wkrY
new InsertSort(), ").gPmC
new BubbleSort(), "I66@d?
new SelectionSort(), qCg<g
new ShellSort(), 9w- )??
new QuickSort(), ^R=`<jx
new ImprovedQuickSort(), D%~tU70a
new MergeSort(), |Fe[RGi+8
new ImprovedMergeSort(), 4j~q,#$LW
new HeapSort() V:w%5'^3
}; tPl 4'tW_
0KnL{Cj
public static String toString(int algorithm){ 2HtsSS#0Q
return name[algorithm-1]; ]L97k(:Ib
} ]f#s`.A~
4^uSW&`;/
public static void sort(int[] data, int algorithm) { 1l$2T y+ =
impl[algorithm-1].sort(data); kV+^1@"
} )O"E#%
ydyTDn
public static interface Sort { Rjq Xz6
public void sort(int[] data); O`c+y
} 3("C'(W
y QClq{A
public static void swap(int[] data, int i, int j) { Xd=KBB[r?
int temp = data; (B>/LsTu
data = data[j]; k?Z:=.YW
data[j] = temp; l3sF/zkH
} ]:OrGD"
} O;~e^ <*