[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; &AoXv`l4
} . m@Sk`s
int i1=l; W29@`93
int i2=mid+1; ;_1D-Mf
for(int cur=l;cur<=r;cur++){ :&9#p%/
if(i1==mid+1) N=)N
data[cur]=temp[i2++]; y*2:(nI
else if(i2>r) KR?-<
data[cur]=temp[i1++]; (VU: &.
else if(temp[i1] data[cur]=temp[i1++]; `~VV1
else HwiG~'Ah9
data[cur]=temp[i2++]; SI4M<'fK
} o%RyE]pw,
} 7K%Ac
gX.4I;
} }Q/xBC)
JY4 +MApN
改进后的归并排序: QEm6#y
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package org.rut.util.algorithm.support; #e{l:!uS\
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import org.rut.util.algorithm.SortUtil; o3qBRT0[R
M,3sK!`>
/** }9:d(B9;
* @author treeroot G# .z((Rj
* @since 2006-2-2 m80QMosp
* @version 1.0 k`'^e/
*/ .ie\3q)
public class ImprovedMergeSort implements SortUtil.Sort { '\[GquK;P
`G@]\)-!
private static final int THRESHOLD = 10; WVir[Kv%
4$@5PS#,
/* 118A6qyi
* (non-Javadoc) rB< UOe
* M(jSv
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) [qI, $ +
*/ ysu"+J
public void sort(int[] data) { l)4KX{Rz{A
int[] temp=new int[data.length]; "2o)1G
mergeSort(data,temp,0,data.length-1); "tn]s>iAd=
} pbl;n|
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private void mergeSort(int[] data, int[] temp, int l, int r) { d+\o>x|Y!Y
int i, j, k; ApG_Gd.
int mid = (l + r) / 2; Dc}-wnga
if (l == r) q~T*R<S
return; !Hr~B.f7
if ((mid - l) >= THRESHOLD) &?#V*-;^
mergeSort(data, temp, l, mid); '[I?G6
else 69p>?zn
insertSort(data, l, mid - l + 1); OtBVfA:[
if ((r - mid) > THRESHOLD) R]/3`X9!d>
mergeSort(data, temp, mid + 1, r); qa.nm4"6+
else +%UfnbZ
insertSort(data, mid + 1, r - mid); /hQTV!\u
0h_9
for (i = l; i <= mid; i++) { ToTehVw
temp = data; L(fOe3 v
} g\,pZ]0i
for (j = 1; j <= r - mid; j++) { >h(n8wTP
temp[r - j + 1] = data[j + mid]; +ZQf$@+
} bLhTgss](
int a = temp[l]; ;wa-\Z
int b = temp[r]; l#Ipo5=
for (i = l, j = r, k = l; k <= r; k++) { U_K"JOZ
if (a < b) { nxS|]
data[k] = temp[i++]; h-].?X,]Q
a = temp; ;xS@-</:
} else { NhU~'k
data[k] = temp[j--]; h.l^f>,/
b = temp[j]; [U5[;BNRD
} !9_HZ(W&
} HQCxO?
} g=XvqD<
yT.h[yv"w
/** -Wd2FD^x
* @param data ;}@.E@s%'
* @param l {^a"T'+
* @param i 'JU(2mF
*/ nm`[\3R
private void insertSort(int[] data, int start, int len) { ~k^rIjR
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); (y*7 gf
} :k*'MU}
} Ub2t7MU
} &)zNu
} 3CL/9C>
.!e):&(8
堆排序： 2!Yq9,`
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package org.rut.util.algorithm.support; 'y[74?1
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import org.rut.util.algorithm.SortUtil; MKf|(6;~
?x1sm"]p'
/** _~/F-
* @author treeroot SR!EQ<
* @since 2006-2-2 _2xNio&
* @version 1.0 -K eoq
*/ z6)b XL[f
public class HeapSort implements SortUtil.Sort{ *:gx1wd
$P&{DOiKS
/* (non-Javadoc) #.L9/b(
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ZP~Mgz{f
*/ ABb,]%
public void sort(int[] data) { >'ev_eAk
MaxHeap h=new MaxHeap(); b+Vfi9<
h.init(data); JZI)jIh
for(int i=0;i h.remove(); 2[ = =
System.arraycopy(h.queue,1,data,0,data.length); <:/Lap#D^
} &W+lwEu
;)$bhNFHx
private static class MaxHeap{ >Q3_-yY+
: fMQ,S0
void init(int[] data){ 6B`XHdCq
this.queue=new int[data.length+1]; MdXOH$ps
for(int i=0;i queue[++size]=data; !IF]P#
fixUp(size); =1sGT;>
} DcYL8u
} -:cBVu-m
`yF6-F
private int size=0; .j^tFvN~L
iZY4+ X
private int[] queue; (+uM |a
X .,Lmh
public int get() { W>TG!R 5
return queue[1]; 0,~||H{
} kb3>q($
+q n[F70}
public void remove() { ,2oFt\`.r
SortUtil.swap(queue,1,size--); 3r^Ls[ey
fixDown(1); S!WG|75B
} #O 2g]YH
file://fixdown "o_s=^U
private void fixDown(int k) { y_mTO4\C2
int j; X})5XYvA*
while ((j = k << 1) <= size) { ^Gi9&fS,
if (j < size %26amp;%26amp; queue[j] j++; 3PkVMX
if (queue[k]>queue[j]) file://不用交换 Znr6,[U+q
break; wnUuoX(
SortUtil.swap(queue,j,k); Ig&H0S
k = j; WbJ|]}hJ\
} pPL)!=o!
} HQ /D)D
private void fixUp(int k) { @}; vl
while (k > 1) { \ SCi\j/a(
int j = k >> 1; >AK9F. _z
if (queue[j]>queue[k]) )j,Y(V$P
break; de=){.7Y
SortUtil.swap(queue,j,k); f/xQy}4+~E
k = j; ~:FF"T>
} xVxN @[
} #qLsAw--Q
mrmm@?
} |\.:h":!0~
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} H(?)v.%
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SortUtil： /U$5'BoS
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package org.rut.util.algorithm; *^y,Gg/
<+y%k~("
import org.rut.util.algorithm.support.BubbleSort; m^!Kthq
import org.rut.util.algorithm.support.HeapSort; 0<i8 ;2KD
import org.rut.util.algorithm.support.ImprovedMergeSort; i?wEd!=w
import org.rut.util.algorithm.support.ImprovedQuickSort; >}T}^F
import org.rut.util.algorithm.support.InsertSort; '\B0#z3
import org.rut.util.algorithm.support.MergeSort; r4 $<,~
import org.rut.util.algorithm.support.QuickSort; rEHlo[7^
import org.rut.util.algorithm.support.SelectionSort; o|G'vMph
import org.rut.util.algorithm.support.ShellSort; $^:s)Yv
Qm_IU!b
/** WOg pDs
* @author treeroot bv^wE,+?o
* @since 2006-2-2 f9K+o-P.h
* @version 1.0 7D(Eo{ue
*/ KvjsibI/Y
public class SortUtil { m!5MGq~
public final static int INSERT = 1; gV}c4>v(
public final static int BUBBLE = 2; !78P+i
public final static int SELECTION = 3; o75l&`
public final static int SHELL = 4; _V`F_C\\#
public final static int QUICK = 5; HPMj+xH
public final static int IMPROVED_QUICK = 6; Ec9%RAxl
public final static int MERGE = 7; t:x"]K
public final static int IMPROVED_MERGE = 8; >sjvE4s
public final static int HEAP = 9; j>8S,b=%
n'To:
public static void sort(int[] data) { "D,}|
sort(data, IMPROVED_QUICK); &=*sN`
} R$h B9BK
private static String[] name={ 2c*w{\X
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" / Q| Z&-c
}; ' !2NSv
\@[Y~:
private static Sort[] impl=new Sort[]{ buldA5*!o
new InsertSort(), R]&lVXyH
new BubbleSort(), S5BS![-QK
new SelectionSort(), L35]'Jua
new ShellSort(), oeYUsnsbi
new QuickSort(), 2= Y8$-
new ImprovedQuickSort(), cYgd1
new MergeSort(), ' hDs.Wnu
new ImprovedMergeSort(), CKnPMvmz
new HeapSort() D&o~4Qvc]
}; J#IVu?B
z6*r<>Bf+b
public static String toString(int algorithm){ (gRTSd T?
return name[algorithm-1]; mEmgr(W
} Cxd^i
h,\5C/
public static void sort(int[] data, int algorithm) { )[ QT?;
impl[algorithm-1].sort(data); qeDXG
} 5O(U1 *
%I=/ y
public static interface Sort { wRdN(`;v
public void sort(int[] data); EK.n $
} EfB.K}b^
!hFzIp
public static void swap(int[] data, int i, int j) { eZ]>;5
int temp = data; j[Jwa*GQP
data = data[j]; :HM~!7e
data[j] = temp; .6!cHL3ln
} bt*
} o@m7@$7