[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; LV{Q,DrP
} 4_?7&G0(
int i1=l; B9dt=j3j2
int i2=mid+1; AONDx3[
for(int cur=l;cur<=r;cur++){ ;3'NMk
if(i1==mid+1) SI:ifR&T
data[cur]=temp[i2++]; j Ch=@<9
else if(i2>r) :;]Oc
data[cur]=temp[i1++]; 6=GZLpv
else if(temp[i1] data[cur]=temp[i1++]; $14:(<
else cQNsL
data[cur]=temp[i2++]; _"a=8a06G
} ^C)n$L>C0
} je,}_:7
.^(/n9|o-
} %|W.^q
256LHY|6
改进后的归并排序: 7*+]wEs
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package org.rut.util.algorithm.support; &]6)LFm
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import org.rut.util.algorithm.SortUtil; $D1w5o-
C@\{ehG
/** 3 fj
* @author treeroot 6=_~0PcY
* @since 2006-2-2 Dr<='Ux[5
* @version 1.0 \;5\9B"i
*/ "8f?h%t
public class ImprovedMergeSort implements SortUtil.Sort { 4<,|*hAT
hS [SRa'.
private static final int THRESHOLD = 10; ;!>Wz9
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/* C]u',9,
* (non-Javadoc) :;;E<74e i
* %V!iQzL1
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) yc;3Id5?>
*/ '_s}o<
public void sort(int[] data) { h+~P"i}&\
int[] temp=new int[data.length]; F t&+vS
mergeSort(data,temp,0,data.length-1); 7u.|XmUz
} <E|s\u
5X.ebd;PT
private void mergeSort(int[] data, int[] temp, int l, int r) { RSfM]w}Hq#
int i, j, k; 5i6 hp;=
int mid = (l + r) / 2; U%B(5cC
if (l == r) 5E\#%K[
return; fN%jJ-[d
if ((mid - l) >= THRESHOLD) qZk'tRv
mergeSort(data, temp, l, mid); _mE^rT
else rnFM/GAy
insertSort(data, l, mid - l + 1); t !`Jse>
if ((r - mid) > THRESHOLD) >QE{O.Z
mergeSort(data, temp, mid + 1, r); Lm*VN~2
else R,2=&+e
insertSort(data, mid + 1, r - mid); 7v}x?I
7Ey#u4Q
for (i = l; i <= mid; i++) { qem(s</:
temp = data; !cW[G/W8
} tq50fq'
for (j = 1; j <= r - mid; j++) { ~,6b_W p/
temp[r - j + 1] = data[j + mid]; 4DWwbO
} OKOu`Hz@
int a = temp[l]; m*0,s
int b = temp[r]; _W!p8cB
for (i = l, j = r, k = l; k <= r; k++) { h[tix:
if (a < b) { G* b2,9&F
data[k] = temp[i++]; qOV[TP,
a = temp; KU9Z"9#
} else { 9W`Frx'h1
data[k] = temp[j--]; #C*8X+._y
b = temp[j]; E4.SF|=x
} ybdd;t}&1
} QrG`&QN
} \$*$='6"
neF]=uCWnT
/** S]3Ev#>
* @param data &<'n^n
* @param l ;,'igdold
* @param i B#%;Qc
*/ '(&%O8Yi
private void insertSort(int[] data, int start, int len) { %bXtKhg5eJ
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); SF]@|
} -ZOBAG*
} 7EhN u@5-
} 8euZTfK9e
} H(^bC5'
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堆排序： 'Yy&G\S
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package org.rut.util.algorithm.support; BfTcI)
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import org.rut.util.algorithm.SortUtil; 8 (jUe
0"k|H&
/** lt'I,Xt
* @author treeroot v0*N)eqDGd
* @since 2006-2-2 -]G(ms;}/Y
* @version 1.0 xom<P+M!|
*/ (kBP(2V
public class HeapSort implements SortUtil.Sort{ w>?Un,K
hmbj*8
/* (non-Javadoc) OU DcY@x~
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) J<n+\F-s
*/ uv{P,]lK
public void sort(int[] data) { }_.:+H!@
MaxHeap h=new MaxHeap(); ']6VB,c`
h.init(data); qd@&59zSh
for(int i=0;i h.remove(); :bU(S<%M
System.arraycopy(h.queue,1,data,0,data.length); +m\|e{G
} /G{_7cb
3*_fzP<R
private static class MaxHeap{ U4?(A@z9^
<g8K})P
void init(int[] data){ ^S)TO}e
this.queue=new int[data.length+1]; {43yb_B(
for(int i=0;i queue[++size]=data; BF|(!8S$U
fixUp(size); mo]KCi
} :Gqy>)CxX
} DLE8+NV8
V% TH7@y
private int size=0; l":c
a.F Al@Br
private int[] queue; $e%2t^ i.g
lw%?z/HDf
public int get() { Z~G my7h(
return queue[1]; 1nj(hg
} {kI#A?M
Ru!He,k7
public void remove() { nHFrG =o,
SortUtil.swap(queue,1,size--); n ?[/ufl
fixDown(1); I lR\ #
} *2"6fX[
file://fixdown }H:F< z*
private void fixDown(int k) { D?jk$^p~m#
int j; UO`;&e-DB
while ((j = k << 1) <= size) { JD>d\z2QC
if (j < size %26amp;%26amp; queue[j] j++; _K9VMczj
if (queue[k]>queue[j]) file://不用交换 y2HxP_s?P?
break; Lju7,/UD
SortUtil.swap(queue,j,k); D,l,`jv*
k = j; @=S}=cl
} ~0"p*?^
} ~iBgw&Y
private void fixUp(int k) { *TW=/+j
while (k > 1) { G>qZxy`c
int j = k >> 1; q=HHNjj8
if (queue[j]>queue[k]) A?5E2T1L%.
break; pVp:@0h
SortUtil.swap(queue,j,k); dth&?/MERL
k = j; 6Sj6i^"
} +KGZHO!
} oj,lz?
MWk:sBCqr
} W" "*ASi
w JwX[\
} UCrh/bTm
Ey{%XR+*;
SortUtil： WnFG{S{s
73A)lU.
package org.rut.util.algorithm; SZ![%)83
yj6@7@l>A
import org.rut.util.algorithm.support.BubbleSort; tqPx$s
import org.rut.util.algorithm.support.HeapSort; %wV>0gQTf
import org.rut.util.algorithm.support.ImprovedMergeSort; V+-$jOh
import org.rut.util.algorithm.support.ImprovedQuickSort; h~U02"$
import org.rut.util.algorithm.support.InsertSort; \b'xt
import org.rut.util.algorithm.support.MergeSort; y@bcYOh3
import org.rut.util.algorithm.support.QuickSort; EY`H}S!xy
import org.rut.util.algorithm.support.SelectionSort; 9ILIEm:
import org.rut.util.algorithm.support.ShellSort; /NT[ETMk+
3LR p2(A
/** =!Vf
* @author treeroot 1xNVdI
* @since 2006-2-2 T`/IO.2
* @version 1.0 M/D)".;
*/ ? Q@kg
public class SortUtil { hli|B+:m"
public final static int INSERT = 1; fHrt+_Zn|
public final static int BUBBLE = 2; 1RLY $M
public final static int SELECTION = 3; gsar[gZ
public final static int SHELL = 4; 6TWWlU^e
public final static int QUICK = 5; =6FUNvP#8
public final static int IMPROVED_QUICK = 6; kID[#g'
public final static int MERGE = 7; HC {XX>F^
public final static int IMPROVED_MERGE = 8; Dq\ Jz~
public final static int HEAP = 9; >>l`,+y
{C`GW}s{4
public static void sort(int[] data) { \2[<XG(^
sort(data, IMPROVED_QUICK); )|j[uh6wo
} ,?UM;^
private static String[] name={ &ej8mq"\
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" (9\;A*CZ
}; -!RtH |P
{s?M*_{|
private static Sort[] impl=new Sort[]{ .%EL\2
new InsertSort(), 9CGNn+~YI
new BubbleSort(), { kSf{>Ia
new SelectionSort(), + Y.1)i}
new ShellSort(), .@)mxC:\K9
new QuickSort(), \e=_ 2^v!_
new ImprovedQuickSort(), ubsSa}$q
new MergeSort(), !9*c8bL D
new ImprovedMergeSort(), 3H\w2V
new HeapSort() ,ea^,H6
}; _i_Q?w`
Mk 0+D#
public static String toString(int algorithm){ |rw%FM{F
return name[algorithm-1]; wCs^J48=
} >DM44
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public static void sort(int[] data, int algorithm) { 5FVndMM#y
impl[algorithm-1].sort(data); MvLs%GE%
} $\o{_?}1
i!2TH~zl
public static interface Sort { UEs7''6RM
public void sort(int[] data); e<7.y#L
} +[@z(N-h
]=rht9),"
public static void swap(int[] data, int i, int j) { _!;Me )C
int temp = data; CQ7{1,?2
data = data[j]; {%)s.5Pfw
data[j] = temp; +:=(#Y
} 5wB =>
} T#%/s?_>.