[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; _Bj":rzY
} wI "U7vr
int i1=l; ??/ 'kmd
int i2=mid+1; L{Vqh0QD&
for(int cur=l;cur<=r;cur++){ -35;j'a
if(i1==mid+1) SZCze"`[
data[cur]=temp[i2++]; II=79$n`G
else if(i2>r) PTV:IzoW
data[cur]=temp[i1++]; eJ81-!)
else if(temp[i1] data[cur]=temp[i1++]; f`66h M[
else 9(<@O%YU
data[cur]=temp[i2++]; z([</D?
} mXs; b 2r^
} wwcBsJ1{
<QGXy=
} _h1mF<\ X^
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改进后的归并排序: _GPl gp:
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package org.rut.util.algorithm.support; J9S>yLQK
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import org.rut.util.algorithm.SortUtil; }W,[/)MO
UkGCyGyZ[
/** {BU;$
* @author treeroot B#1;r-^P<
* @since 2006-2-2 IEvdV6{K
* @version 1.0 Jj%K=sw
*/ `~q<N
public class ImprovedMergeSort implements SortUtil.Sort { Yu2Bkq+
ht}wEvv
private static final int THRESHOLD = 10; jZrq{Z<
~WV"SaA)*U
/* ]')RMg zM*
* (non-Javadoc) IV)j1
* IMONgFBS
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) kB%JNMF{A
*/ y1L,0 ]
public void sort(int[] data) { }\k"n{!"
int[] temp=new int[data.length]; A\5L 7
mergeSort(data,temp,0,data.length-1); iO; 7t@]-
} ,~W|]/b<q
x'R`. !g3
private void mergeSort(int[] data, int[] temp, int l, int r) { \Y}8S/]
int i, j, k; mpJ#:}n
int mid = (l + r) / 2; Wo=jskBrQ
if (l == r) `Ryp% Bn
return; <1M-Ro?5k
if ((mid - l) >= THRESHOLD) ;t`&n['N>
mergeSort(data, temp, l, mid); U:_^#\p
else \1Em`nvOX
insertSort(data, l, mid - l + 1); r",GC]
if ((r - mid) > THRESHOLD) sCHJ&>m5-
mergeSort(data, temp, mid + 1, r); "C`Ub
else [}]Q?*_
insertSort(data, mid + 1, r - mid); S>1Iky|
-A!%*9Z
for (i = l; i <= mid; i++) { 7Hu3>4<
temp = data; J5jvouR
} jEJT-*I1+
for (j = 1; j <= r - mid; j++) { uM6+?A9@l
temp[r - j + 1] = data[j + mid]; k"w"hg&e
} k|d+#u[Mj@
int a = temp[l]; $* Kvc$D
int b = temp[r]; wLr_-vJ
for (i = l, j = r, k = l; k <= r; k++) { wq`Bd
if (a < b) { }RqK84K
data[k] = temp[i++]; >[*qf9$
a = temp; *c+ (-
} else { <c/5b]No
data[k] = temp[j--]; *~i ])4
b = temp[j]; /&94 eC
} ,zY$8y]
} 'uEl~> l7
} 2jhxQL
1|wL\I
/** f& '
* @param data N]sAji*
* @param l I,8Er2;)
* @param i C;urBsC
*/ uGlUc<B\*
private void insertSort(int[] data, int start, int len) { q'82qY
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); HHsmLo c4
} U4B(#2'
} wD)XjX
} ~e@z;]CiY
} @;RXLq/8
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堆排序： ~/P[J
vRO _Q?
package org.rut.util.algorithm.support; wAW5 Z0D
?5 7Sk+
import org.rut.util.algorithm.SortUtil; I2 P@L?h
D d</`iUq
/** 9q[oa5INd
* @author treeroot uW36;3[f#1
* @since 2006-2-2 w+CA1q<
* @version 1.0 lU8`F(Mn
*/ /I0%Z+`=
public class HeapSort implements SortUtil.Sort{ 3:i@II
TWFr 4-
/* (non-Javadoc) CizX<Cr}
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 3/n5#&c\4
*/ Jze:[MYS
public void sort(int[] data) { JFk lUgg
MaxHeap h=new MaxHeap(); 9-*uPK]m9
h.init(data); omBoo5e
for(int i=0;i h.remove(); s!7y
System.arraycopy(h.queue,1,data,0,data.length); k+pr \d~
} p=}Nn(
65Yv4pNL
private static class MaxHeap{ C>*u()q>4h
?<'}r7D
void init(int[] data){ #4 pB@_
this.queue=new int[data.length+1]; SI-Ops~e
for(int i=0;i queue[++size]=data; 'SF<_aS(
fixUp(size); ^ (zYzd
} W9GVt$T7
} %d<"l~<5;
7O-x<P;
private int size=0; H~1jY4E
w&T9;_/
private int[] queue; SNI)9k(T{
Hja3a{LH
public int get() { nc|p)
return queue[1]; G*P#]eO
} X_\otVh(D
'16b2n+F@#
public void remove() { V[Ui/M!9Z
SortUtil.swap(queue,1,size--); ,1o FPa{?
fixDown(1); j+ 0I-p
} 5C5sgR C
file://fixdown b}TS0+TF
private void fixDown(int k) { JrRH\+4K
int j; j HJ`,#
while ((j = k << 1) <= size) { L0WN\|D
if (j < size %26amp;%26amp; queue[j] j++; b!5~7Ub.No
if (queue[k]>queue[j]) file://不用交换 XuM'_FN`A<
break; 2!=f hN
SortUtil.swap(queue,j,k); Gu\q%'I
k = j; 9m~p0ILh
} *wB1,U{
} QE`bSI
private void fixUp(int k) { e h?zNu2=
while (k > 1) { q'Tf,a
int j = k >> 1; ExL0?FemWV
if (queue[j]>queue[k]) L>4"(
break; -4{<=y?"a
SortUtil.swap(queue,j,k); 'kO!^6=4M
k = j; lp%pbx43s
} .jjG(L
} H]Z$OpI
tG22#F`
} t=W}SH
mSl.mi(JiZ
} K^<BW(s
+}os&[S
SortUtil： UhQj Qaa~
0[?Xxk}s0
package org.rut.util.algorithm; ?QdWrE_
PP33i@G
import org.rut.util.algorithm.support.BubbleSort; @YTaSz$L
import org.rut.util.algorithm.support.HeapSort; 9 X`Sm}i
import org.rut.util.algorithm.support.ImprovedMergeSort; a'yK~;+_9
import org.rut.util.algorithm.support.ImprovedQuickSort; SbrecZ
import org.rut.util.algorithm.support.InsertSort; )W _v:?A9
import org.rut.util.algorithm.support.MergeSort; 3K0A)W/YEs
import org.rut.util.algorithm.support.QuickSort; OU $#5
import org.rut.util.algorithm.support.SelectionSort; ud@%5d
import org.rut.util.algorithm.support.ShellSort; <&g,Nc'5C
PmEsN&YP]
/** 3kp+<$
* @author treeroot 6) [H?Q
* @since 2006-2-2 ]:k/Y$O2
* @version 1.0 gu.}M:u
*/ =wV<hg)C
public class SortUtil { m'=Crei
public final static int INSERT = 1; e)? .r9pA;
public final static int BUBBLE = 2; =|y9UlsD
public final static int SELECTION = 3; IDriGZZ<)6
public final static int SHELL = 4; h_,i&d@(
public final static int QUICK = 5; j@3Q;F0ba
public final static int IMPROVED_QUICK = 6; r1{@Ucw2
public final static int MERGE = 7; ">,|V-H
public final static int IMPROVED_MERGE = 8; LG|fq/;
public final static int HEAP = 9; czgO ;3-C
.2Elr(&*h
public static void sort(int[] data) { yEoF4bt
sort(data, IMPROVED_QUICK); Ww+IWW@
} Ad9}9!<
private static String[] name={ x,pjpx
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" l'E*=Rn
}; paE[rS\
3J|F?M"N7
private static Sort[] impl=new Sort[]{ nRZ]z( b
new InsertSort(), 8COGsWK
new BubbleSort(), ,~@X{7U
new SelectionSort(), RmeD$>7
new ShellSort(), SBk4_J/_
new QuickSort(), u$Jz~:=,
new ImprovedQuickSort(), .|>3k'<l
new MergeSort(), ep)n_!$OH"
new ImprovedMergeSort(), `V)8 QRN(
new HeapSort() +`3)oPV)
}; ' ;FnIZ
|tMWCA
public static String toString(int algorithm){ E`usknf>l
return name[algorithm-1]; Hc$O{]sq
} a;qryUyG
=M[bnq*\
public static void sort(int[] data, int algorithm) { lc1(t:"[
impl[algorithm-1].sort(data); jTtu0Q|
} .*S#aq4S
b;W3j
public static interface Sort { &4x}ppX
public void sort(int[] data); oC: {aK6\
} G+"t/?/
/1V xc 6
public static void swap(int[] data, int i, int j) { )9'K($
int temp = data; 7<#U(,YEA
data = data[j]; ;oKZ!ND
data[j] = temp; 6"5A%{J
} 6"O+w=5B
} qHplJ "