[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; W?.469yy
} ya8p 4N{_
int i1=l; +yWD>PY(
int i2=mid+1; _90D4kGU
for(int cur=l;cur<=r;cur++){ NknS:r&2
if(i1==mid+1) y&,|+h
data[cur]=temp[i2++]; CE`]X;#y
else if(i2>r) ^rVHaI
data[cur]=temp[i1++]; [:cD
else if(temp[i1] data[cur]=temp[i1++]; 6-_g1vq
else Ul_Zn
data[cur]=temp[i2++]; )4=86>XJT
} ITw *m3
} vu*e*b$}
u_^mN9h
} I0~'z f
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改进后的归并排序: ]|CcQ1#|H
?uSoJM`wa!
package org.rut.util.algorithm.support; r{R<J?Y
-a)1L'R
import org.rut.util.algorithm.SortUtil; IAH"vHM
6~%><C
/** H_RfIX)X
* @author treeroot zX_F+"]THt
* @since 2006-2-2 q8d](MaX
* @version 1.0 mBErU6?X,A
*/ 2~$S @c
public class ImprovedMergeSort implements SortUtil.Sort { $WIVCp
r&4Xf#QD6
private static final int THRESHOLD = 10; @\y{q;
i|1*bZ6'
/* @FN|=?8%
* (non-Javadoc) ]!{S2x&"
* #]jl{K\f#X
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) LsWD^JE.
*/ l{dsm1#W~
public void sort(int[] data) { %@vF%
int[] temp=new int[data.length]; e n~m)r3&
mergeSort(data,temp,0,data.length-1); ~x,_A>a
} ,<%uG6/",g
RlL]p`g
private void mergeSort(int[] data, int[] temp, int l, int r) { JW[6 ^Rw
int i, j, k; H}kZ;8
int mid = (l + r) / 2; vWoppt
if (l == r) oM!&S'M/
return; 'd$RNqe
if ((mid - l) >= THRESHOLD) T<0r,
mergeSort(data, temp, l, mid); H7tviSTd
else /X_L>or
insertSort(data, l, mid - l + 1); |)!f".`
if ((r - mid) > THRESHOLD) BEaF-*?A
mergeSort(data, temp, mid + 1, r); !vf:mMo
else "HJ^>%ia
insertSort(data, mid + 1, r - mid); BjfVNF;hk:
jXeE]A"
for (i = l; i <= mid; i++) { n!z!fh
temp = data; 9PKXQp
} F~6]II
for (j = 1; j <= r - mid; j++) { o>8~rtl
temp[r - j + 1] = data[j + mid]; ikc1,o
} !*:g??[T
int a = temp[l]; {ze69 h
int b = temp[r]; V#w$|2
for (i = l, j = r, k = l; k <= r; k++) { l48$8Mgrr
if (a < b) { "/6#Z>y
data[k] = temp[i++]; Cy?]o?_?
a = temp; R/v|ZvI
} else { #S?^?3d
data[k] = temp[j--]; 'l^Bb#)"
b = temp[j]; 8S#$'2sT
} X0 |U?Ib?
} P6GTgQ<'BA
} X6 BIZ
]!AS%D`
/** )<V!lsUx'-
* @param data 06&;GW!-
* @param l "yw{A%J
* @param i $^fF}y6N
*/ oUnb-,8n
private void insertSort(int[] data, int start, int len) { anW['!T9{s
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); 1TTS@\
} G K~A,Miqk
} c)#7T<>*'
} H7+z"^s*
} tM"vIz 05
j:cu;6|
堆排序： :Ob4WU
9!jF$
package org.rut.util.algorithm.support; TQO|C?
s;bGg
import org.rut.util.algorithm.SortUtil; IB# ua:
CCG5:xS
/** P-ZvW<M
* @author treeroot tkV[^OeU>
* @since 2006-2-2 PWS8Dpb
* @version 1.0 R7rM$|n=o
*/ H&ek"nP_
public class HeapSort implements SortUtil.Sort{ _XZK2Q[
O83J[YuzjN
/* (non-Javadoc) --y,ky#
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 7Z2D}O+
*/ !7\dr )
public void sort(int[] data) { ^ q ba<#e
MaxHeap h=new MaxHeap(); BywEoS
h.init(data); o%+w:u.
for(int i=0;i h.remove(); yI8O#
System.arraycopy(h.queue,1,data,0,data.length); iyCH)MA
} xytWE:=
P4"BX*x
private static class MaxHeap{ 4}D&=0IZ
e6'0g=Y#
void init(int[] data){ =?Ry,^=b
this.queue=new int[data.length+1]; S".|j$
for(int i=0;i queue[++size]=data; qDGx(d
fixUp(size); 1sza\pR<
} 2A
} LT{g^g
=UO7!vr;[
private int size=0; ]z7pa^
Z .`+IN(>E
private int[] queue; uq6>K/~D
3U?gw!M>
public int get() { $Rze[3
return queue[1]; TQt[he$O
} S9:ij1
|(x%J[n0+
public void remove() { _Iy)p{y
SortUtil.swap(queue,1,size--); b6e2a/x
fixDown(1); T^8`ji
} -;Mh|!yg
file://fixdown M&Q&be84
private void fixDown(int k) { 7KC2%s#7
int j; &Kc45
while ((j = k << 1) <= size) { f~?5;f:E
if (j < size %26amp;%26amp; queue[j] j++; @pvQci
if (queue[k]>queue[j]) file://不用交换 %j0c|u
break; %j2:W\g:
SortUtil.swap(queue,j,k); t:.X=/02
k = j; sFk{Tv@Yz
} p*$=EomY
} \HoVS
private void fixUp(int k) { ak}ke
while (k > 1) { sAX4giaLD
int j = k >> 1; "5,Cy3
if (queue[j]>queue[k]) Z~ q="CA4
break; 5=<fJXf5y
SortUtil.swap(queue,j,k); ODCN~7-@
k = j; q 3,p=ijJ
} 7'.6/U
} SX?hu|g_r
3gCP?%R
} BW`Tw^j
->'q
} (:#4{C
0oyZlv*
SortUtil： k V'0rb
rt! lc-g%/
package org.rut.util.algorithm; dr=KoAIxy
ui*CA^ Y
import org.rut.util.algorithm.support.BubbleSort; "X1{*
import org.rut.util.algorithm.support.HeapSort; P^/e!%UgC
import org.rut.util.algorithm.support.ImprovedMergeSort; rYyEs I#qo
import org.rut.util.algorithm.support.ImprovedQuickSort; Zg;Ht
import org.rut.util.algorithm.support.InsertSort; 8{.:$T
import org.rut.util.algorithm.support.MergeSort; B&lF! ]
import org.rut.util.algorithm.support.QuickSort; O;;vz+ j
import org.rut.util.algorithm.support.SelectionSort; `yb,z
import org.rut.util.algorithm.support.ShellSort; -QydUr/(o
~o/e0
/** 0K^G>)l
* @author treeroot WB|SXto%4D
* @since 2006-2-2 h,Tsb:Q"M
* @version 1.0 #kEa&Se
*/ ,OO0*%
public class SortUtil { |)R{(AK-
public final static int INSERT = 1; SJI+$L\'
public final static int BUBBLE = 2; 5zII4ukn*
public final static int SELECTION = 3; ^pZ\:
public final static int SHELL = 4; DU[vLe|Z
public final static int QUICK = 5; BBm;QOBU
public final static int IMPROVED_QUICK = 6; iu.+bX|b
public final static int MERGE = 7; R<-(
public final static int IMPROVED_MERGE = 8; \c$!C8z
public final static int HEAP = 9; :~]ha
{-Y% wM8<i
public static void sort(int[] data) { JS1''^G&.
sort(data, IMPROVED_QUICK); Q2/ZO2
} > jvi7
private static String[] name={ |Gh~Zup
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" }M9L,O*^
}; Z:}d\~`x$%
!pLQRnI}6
private static Sort[] impl=new Sort[]{ x+7jJ=F
new InsertSort(), :X;'37o#q
new BubbleSort(), $n?@zd@53
new SelectionSort(), Y/_b~Ahn
new ShellSort(), cUz7F
new QuickSort(), pTlNJ!U>
new ImprovedQuickSort(), H-o>|C
new MergeSort(), bO%bMZWB!y
new ImprovedMergeSort(), n089tt=TE
new HeapSort() (1(dL_?
}; hqVFb.6[
e" f/
public static String toString(int algorithm){ QvH=<$
return name[algorithm-1]; DLv\]\h}L
} |%R}!O<.c
SablF2doa
public static void sort(int[] data, int algorithm) { o'Byuct
impl[algorithm-1].sort(data); 2\M^_x$N
} c_li.]P
7 Ld5
public static interface Sort { #B3P3\
public void sort(int[] data); B#_<?
} I|*w?i*
.>0j<|~
public static void swap(int[] data, int i, int j) { 3%G>TB
int temp = data; tB_GEt2M
data = data[j]; C$~2FTx
data[j] = temp; )Fh+6
} 9"3 7va
} :O}=$[