[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; f"NWv!
} SG1AYUs V
int i1=l; g[uf e<
int i2=mid+1; O(9*VoD
for(int cur=l;cur<=r;cur++){ gjFQDrz(
if(i1==mid+1) ?<5KLvGv
data[cur]=temp[i2++]; QAMcI:5
else if(i2>r) rhX?\_7o
data[cur]=temp[i1++]; TJ>1?W\Z
else if(temp[i1] data[cur]=temp[i1++]; vA[7i*D{w
else ,7DyTeMpN
data[cur]=temp[i2++]; 94]i|2qj*
} y+V>,W)r7
} cM4{ e^
#yU"n-eLR
} (ip3{d{CT]
pp{GaCi
改进后的归并排序: e**'[3Y
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package org.rut.util.algorithm.support; ( z F_<
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import org.rut.util.algorithm.SortUtil; `2^(Ss#)
83p8:C.Ze
/** CC'N"Xb
* @author treeroot N3a ]!4Y\
* @since 2006-2-2 ~*+evAP
* @version 1.0 cS2]?zI
*/ LyR<cd$W
public class ImprovedMergeSort implements SortUtil.Sort { A:(qF.Tm
57]La^#
private static final int THRESHOLD = 10; X?JtEQ~>
&.#dZ}J
/* h?}S|>9
* (non-Javadoc) T&bB8tQk
* hd[t&?{=
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) }odjaM}5Nc
*/ k,8^RI07@
public void sort(int[] data) { t]iKU@3
int[] temp=new int[data.length]; }<w9Jfr"X
mergeSort(data,temp,0,data.length-1); %qqeL
} tB4yj_ZF
eb6y-TwY
private void mergeSort(int[] data, int[] temp, int l, int r) { {ot6ssT=D
int i, j, k; ~?)y'?
int mid = (l + r) / 2; AMO{ee7Po
if (l == r) v6E5#pse8
return; g:U -kK!i
if ((mid - l) >= THRESHOLD) yS[HYq
mergeSort(data, temp, l, mid); IjXxH]2
else qSD3]Dv"
insertSort(data, l, mid - l + 1); B<$6Dj%L
if ((r - mid) > THRESHOLD) -%K}~4J
mergeSort(data, temp, mid + 1, r); &%k_BdlkQ
else St> E\tXp
insertSort(data, mid + 1, r - mid); Goy[P2m
+^J;ic
for (i = l; i <= mid; i++) { '"ze Im~
temp = data; 5B8fz;l= B
} jqTK7b
for (j = 1; j <= r - mid; j++) { P3Ah1X7W"C
temp[r - j + 1] = data[j + mid]; v |pHbX
} aSJD'u4w.a
int a = temp[l]; kho0@o+'^
int b = temp[r]; "gDk?w
for (i = l, j = r, k = l; k <= r; k++) { JE*?O*&|Q
if (a < b) { jHA(mU)b
data[k] = temp[i++]; HqV4!o9'
a = temp; olXfR-2>1
} else { | >yc|W
data[k] = temp[j--]; 9}42s+
b = temp[j]; J~ +p7S
} qzLD
} qLKL*m
} zzh7 "M3Qn
]gF=I5jn]
/** D5].^*AbZ
* @param data ~XvMiWuo
* @param l "-AFWWKtx
* @param i 1|>bG#|
*/ Y`6<:8[?
private void insertSort(int[] data, int start, int len) { Gc5mR9pV
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); g?Rq .py]!
} MU:v& sk
} hgwS_L
} HW'I$ .
} 'dv(
s.KfMJ"u[
堆排序： vkM_a}%<
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package org.rut.util.algorithm.support; >%n6n! "
n* .<L
import org.rut.util.algorithm.SortUtil; /5 OQ0{8p
YdB/s1|G
/** YG*}F|1
* @author treeroot |S]fs9
* @since 2006-2-2 73{<;z}i
* @version 1.0 b.}J'?yLm
*/ Eq=JmO'gHs
public class HeapSort implements SortUtil.Sort{ Bi"cWO
e ^`La*n
/* (non-Javadoc) 8vfC
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) &Wk:>9]Jrb
*/ kKDf%=
public void sort(int[] data) { o4LVG
MaxHeap h=new MaxHeap(); C8}=fa3u
h.init(data); vNZ"x)?
for(int i=0;i h.remove(); ]~ S zb
System.arraycopy(h.queue,1,data,0,data.length); nf:wJ-;*
} 2uF'\y
{W%XSE
private static class MaxHeap{ oL!C(\ERh
4Yt'I#*
void init(int[] data){ R+/kx#^
this.queue=new int[data.length+1]; W*n|T{n
for(int i=0;i queue[++size]=data; 5a2;@}%V
fixUp(size); .R@XstQ
} }wJH@'0+
} 0wF)bQv1
GW7+#
private int size=0; X]\; f
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private int[] queue; r CUs
}We-sZ/w7r
public int get() { 3-[+g}kak?
return queue[1]; 1&Mpx!K*T
} )2u_[Jc=
UjyrmQf
public void remove() { 9PaV*S(\TR
SortUtil.swap(queue,1,size--); , 0?_? GO
fixDown(1); ^$rqyWZYp
} V~Jt
file://fixdown Tq6\oIBkV
private void fixDown(int k) { e#WASHZN
int j; OL@$RTh
while ((j = k << 1) <= size) { {"rL3Lk
if (j < size %26amp;%26amp; queue[j] j++; @f,/K1k
if (queue[k]>queue[j]) file://不用交换 )U8=-_m
break; ZK<c(,oZ^
SortUtil.swap(queue,j,k); 5 (q4o`
k = j; "=$uv
} zW[HGI6w
} azRp4~2?
private void fixUp(int k) { S]4!uv^y
while (k > 1) { N,F[x0&?
int j = k >> 1; 5UG"i_TC
if (queue[j]>queue[k]) (tiE%nF+
break; lcfs 1].
SortUtil.swap(queue,j,k); uE..1N&*
k = j; NZ+TTMv
} "od2i\
} =t|,6Vp
bY~V?yNgKM
} Iy5)SZ'
\"Qa)1|
} uOh
~{{7y]3M-
SortUtil： `84,R!
V%`\x\Xat
package org.rut.util.algorithm; h66mzV:`
_d>{Hz2
import org.rut.util.algorithm.support.BubbleSort; n9Vr*RKM)
import org.rut.util.algorithm.support.HeapSort; {c<cSrfI
import org.rut.util.algorithm.support.ImprovedMergeSort; @jZ1WHS_a
import org.rut.util.algorithm.support.ImprovedQuickSort; bJw{U.
import org.rut.util.algorithm.support.InsertSort; w5t|C>
import org.rut.util.algorithm.support.MergeSort; .B! Z0
import org.rut.util.algorithm.support.QuickSort; {CX06BP
import org.rut.util.algorithm.support.SelectionSort; e=_Ng j)
import org.rut.util.algorithm.support.ShellSort; pTH5-l_f]
:g+wv}z
/** MaF4lFmS
* @author treeroot CWb*bw0
* @since 2006-2-2 /HdjPxH
* @version 1.0 fW=eB'Sl
*/ 7IrH(~Fo
public class SortUtil { 3A.lS+P1
public final static int INSERT = 1; :+8qtIytKX
public final static int BUBBLE = 2; {?r5~T`2
public final static int SELECTION = 3; `1lGAKv
public final static int SHELL = 4; uu/2C \n}
public final static int QUICK = 5; Ve xxdg
public final static int IMPROVED_QUICK = 6; yMpZ-b$*~
public final static int MERGE = 7; \86NV="U
public final static int IMPROVED_MERGE = 8; ghTue*A
public final static int HEAP = 9; O]oH}#5b
N]F}Z#h
public static void sort(int[] data) { EQ>@K-R
sort(data, IMPROVED_QUICK); +.-mqtM
} ]UGk"s5A
private static String[] name={ h1$75E?,
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" h"f_T [
}; 7s Gf_`Z
l4U
private static Sort[] impl=new Sort[]{ c/l^;6O/!\
new InsertSort(), \4O_@d`A
new BubbleSort(), C>QWV[F
new SelectionSort(), Tz&h[+6`
new ShellSort(), v]}\Ns/
new QuickSort(), YhP+{Y8t
new ImprovedQuickSort(), _ Ewkb
new MergeSort(), &7r a
new ImprovedMergeSort(), TK0W=&6#A
new HeapSort() OMBH[_
}; x }]"jj2x
D J7U6{KLq
public static String toString(int algorithm){ s? 2ikJq
return name[algorithm-1]; hV fANbs
} @E>I<j,D
gSe3S-Lt
public static void sort(int[] data, int algorithm) { v^Rw9*w{
impl[algorithm-1].sort(data); Ml'lZ)
} /Zxq-9
k:N/-P&+
public static interface Sort { dfh 1^Go
public void sort(int[] data); yI/ FD
} Zh`[A9I/
b,>>E^wd!
public static void swap(int[] data, int i, int j) { 3u< ntx ><
int temp = data; 2q*wYuc
data = data[j]; bHQ) :W
data[j] = temp; Ko|gH]B'
} pm[+xM9PB
} @gw8r[