[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; &eU3(F`.
} f P+QxOz
int i1=l; {b[tA, >
int i2=mid+1; hw*1gm
for(int cur=l;cur<=r;cur++){ L -YNz0A
if(i1==mid+1) vABXXB
data[cur]=temp[i2++]; %oR>Uo
else if(i2>r) } +1'{B"I
data[cur]=temp[i1++]; CPVmF$A-
else if(temp[i1] data[cur]=temp[i1++]; 0juDuE?
else pcNSL'u+
data[cur]=temp[i2++]; QsM*wT&aa
} A=0@UqM
} moaodmt]x
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} 1c/ X
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改进后的归并排序: C>NQ-w^
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package org.rut.util.algorithm.support; D@:"f?K>
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import org.rut.util.algorithm.SortUtil; ZRPE-l_3:
VJ*\pM@no
/** $3]b>v
* @author treeroot w1cw1xX*
* @since 2006-2-2 brfKd]i
* @version 1.0 h^Qh9G0dn
*/ ETe-
public class ImprovedMergeSort implements SortUtil.Sort { Nkx0CG*
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private static final int THRESHOLD = 10; _Yy:s2I8B
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/* v[smQO
* (non-Javadoc) VE*j*U j
* xb]odYGdW
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) IyOpju)?
*/ IKo;9|2U
public void sort(int[] data) { LfHzT<)|
int[] temp=new int[data.length]; 4j{oaey
mergeSort(data,temp,0,data.length-1); y #69|G
} 6Etss!_
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private void mergeSort(int[] data, int[] temp, int l, int r) { ?d~]Wd!z
int i, j, k; -w\M-wc/$
int mid = (l + r) / 2; Oi6Eo~\f
if (l == r) 5tMh/]IeS
return; 5y040 N-
if ((mid - l) >= THRESHOLD) b9DR%hO:
mergeSort(data, temp, l, mid); /,LfA2^_j{
else o(zTNk5d
insertSort(data, l, mid - l + 1); =!<^^6LZ
if ((r - mid) > THRESHOLD) .$P|^Zx,
mergeSort(data, temp, mid + 1, r); b[yE~EQxr
else N2[jO+6
insertSort(data, mid + 1, r - mid); F;-90w
l=xt;c!
for (i = l; i <= mid; i++) { XddHP;x
temp = data; K0oFPDJN
} qF'~F`6
for (j = 1; j <= r - mid; j++) { 4~*Y];!Q
temp[r - j + 1] = data[j + mid]; cLAesj
} 6{8/P'@/Zz
int a = temp[l]; >J@egIKzP
int b = temp[r]; ]x@~-I )
for (i = l, j = r, k = l; k <= r; k++) { L_k9g12
if (a < b) { %E aE,
data[k] = temp[i++]; hF.6}28U1
a = temp; K\aAM;)-
} else { JN|VPvjE
data[k] = temp[j--]; M7vj^mt?
b = temp[j]; NocFvF7\
} S~> 5INud
} xD4$0Ppu
} #)`\!)?
26 ?23J ;
/** Dp`HeSKU^
* @param data $WR?
* @param l Wy.";/C
* @param i Je@kiE
*/ @701S(0'7
private void insertSort(int[] data, int start, int len) { {"jd_b&
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); gApz:K[l
} _YLUS$Zw
} !*_K.1'
} sl^n6N
} @mNJ=mEV
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堆排序： +6oG@
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package org.rut.util.algorithm.support; {>h97}P
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import org.rut.util.algorithm.SortUtil; >(3'Tnu
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/** Z%e|*GS{
* @author treeroot tt{`\1q
* @since 2006-2-2 C\A49q
* @version 1.0 ,T{oy:rB
*/ a,cC!
public class HeapSort implements SortUtil.Sort{ ~&KX-AC@
'?8Tx&}U8
/* (non-Javadoc) # 66e@
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) V^2-_V]8
*/ \K}aQKB/j
public void sort(int[] data) { 8YKQItK
MaxHeap h=new MaxHeap(); ~#Aa Ldq
h.init(data); r)8z#W>s
for(int i=0;i h.remove(); "xn|zB
System.arraycopy(h.queue,1,data,0,data.length); LABNj{=D!
} :Y^I]`lR"
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private static class MaxHeap{ d;44;*D
a:b^!H>#
void init(int[] data){ M(2`2-/xh
this.queue=new int[data.length+1]; mW +tV1XjG
for(int i=0;i queue[++size]=data; .8(%4ejJ(
fixUp(size); ;UpJ=?W
} :Eo8v$W\RB
} />F.Nsujy
Hk9U&j$
private int size=0; L/fRF"V
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private int[] queue; D%gGRA
c{VJ2NQ+
public int get() { 0m&3?"5u
return queue[1]; ,E9d\+j
} >)3VbO
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public void remove() { |!}wF}iLc)
SortUtil.swap(queue,1,size--); pX_b6%yX(
fixDown(1); F~R7~ZE
} 7kd|K b(
file://fixdown OD|1c6+X
private void fixDown(int k) { ,ux+Qz5(
int j; H#Q;"r3
while ((j = k << 1) <= size) { wDw<KU1UK
if (j < size %26amp;%26amp; queue[j] j++; IT&i,`cJ~F
if (queue[k]>queue[j]) file://不用交换 .[(P
break; TVeJ6
SortUtil.swap(queue,j,k); q% EC
k = j; u*2JUI*
} ]| WA#8_|
} ]EN&SWh
private void fixUp(int k) { $20s]ywS
while (k > 1) { ~-<:+9m
int j = k >> 1; EY$?^iS
if (queue[j]>queue[k]) DY.58IHg1
break; l{Er+)a
SortUtil.swap(queue,j,k); u E.^w;~2=
k = j; _Wma\(3$
} +>#e=nH
} M5O'=\+,F
}"4roJ
} oIxH3T
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} h[Mdr
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SortUtil： vi|Zit
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package org.rut.util.algorithm; +nQ!4
<T4(H[9B
import org.rut.util.algorithm.support.BubbleSort; a.,i.2
import org.rut.util.algorithm.support.HeapSort; G=cNzr9
import org.rut.util.algorithm.support.ImprovedMergeSort; OoM_q/oI
import org.rut.util.algorithm.support.ImprovedQuickSort; c[:Wf<%|
import org.rut.util.algorithm.support.InsertSort; t:T?7-XIE
import org.rut.util.algorithm.support.MergeSort; b{pg!/N4
import org.rut.util.algorithm.support.QuickSort; Hg whe=P
import org.rut.util.algorithm.support.SelectionSort; jb3.W
import org.rut.util.algorithm.support.ShellSort; Spo+@G
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/** 9wMEvX70
* @author treeroot a(|xw
* @since 2006-2-2 MA6P"?
* @version 1.0 9U'[88
*/ ,LZ(^u
public class SortUtil { 5~U:@Tp
public final static int INSERT = 1; xlw 2g<s
public final static int BUBBLE = 2; p8>R#9
public final static int SELECTION = 3; (:OHyeNt
public final static int SHELL = 4; 7&#m]t^^
public final static int QUICK = 5; Pi){h~B>
public final static int IMPROVED_QUICK = 6; f3t.T=S
public final static int MERGE = 7; Lzz)n%y5
public final static int IMPROVED_MERGE = 8; ~p^7X2% !
public final static int HEAP = 9; pL)xqKj
{MxnIg7'
public static void sort(int[] data) { :'Xr/| s
sort(data, IMPROVED_QUICK); S.hC$0vrj
} <I1y
private static String[] name={ 045\i[l=
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" p%8v`
}; !sG"n&uZq
v:A:37#I
private static Sort[] impl=new Sort[]{ |[ocyUsxX
new InsertSort(), `j:M)2:*y
new BubbleSort(), W>:kq_gT
new SelectionSort(), A$<>JVv
new ShellSort(), pyF5S,c
new QuickSort(), XN(tcdCG
new ImprovedQuickSort(), >2Ca5C
new MergeSort(), s|gp
new ImprovedMergeSort(), |z+9km7,
new HeapSort() A6i et~h[
}; [Auc*@
C fSl 54
public static String toString(int algorithm){ x< S\D&
return name[algorithm-1]; !o<ICHHH
} u}m.}Mws
:MBS>owR
public static void sort(int[] data, int algorithm) { >b43%^yii
impl[algorithm-1].sort(data); y1u9B;Fd
} ?@3&dk~ni
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public static interface Sort { B.6`cM^
public void sort(int[] data); phS>T
} ]vGgJ<
@?d?e+B
public static void swap(int[] data, int i, int j) { LfllO
int temp = data; (Y)!"_|
data = data[j]; Y'JL(~|
data[j] = temp; |!xpYT:
} KGQC't
} Xy!&^C` J`