[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[EEA_\
} n-<`Z NMU
int i1=l; %(s2{$3
int i2=mid+1; ma"M?aM
for(int cur=l;cur<=r;cur++){ q>6,g>I
if(i1==mid+1) dKw[#(m5v
data[cur]=temp[i2++]; 9,"gXsvx(
else if(i2>r) &[yYgfsp
data[cur]=temp[i1++]; ]2|KG3t
else if(temp[i1] data[cur]=temp[i1++]; 4]Gm4zO
else -;i:bE
data[cur]=temp[i2++]; F>%,}Y~B:
} 2<V`
} gxC`Ml
.PuxF
} <N=ow"rD
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改进后的归并排序: "ZmxHMf
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package org.rut.util.algorithm.support; '}F9f?
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import org.rut.util.algorithm.SortUtil; @ W q8AFo
UyF;sw
/** \Z~ <jv
* @author treeroot l9H-N*Wx
* @since 2006-2-2 vJ&35nF&
* @version 1.0 hIa,PZ/Q
*/ hWbjA[a/
public class ImprovedMergeSort implements SortUtil.Sort { avXBCvP+h
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private static final int THRESHOLD = 10; Q H>g-@
!yKrA|w1
/* QP@@h4J^
* (non-Javadoc) +5kQ;D{+
* *$mb~k^R
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) XqcNFSo)
*/ Jr>Nc}!U
public void sort(int[] data) { 'w|N} 4
int[] temp=new int[data.length]; M?['HoRo
mergeSort(data,temp,0,data.length-1); CdtwR0
} ^6!8)7b
;BHIss7
private void mergeSort(int[] data, int[] temp, int l, int r) { \z.p [;'ir
int i, j, k; -W|~YK7e
int mid = (l + r) / 2; [[}ukG4
if (l == r) bF +d_t
return; .ffr2\'*
if ((mid - l) >= THRESHOLD) T%YN(f
mergeSort(data, temp, l, mid); 4!?4Tc!X
else 160BgFM
insertSort(data, l, mid - l + 1); W,nn,%
if ((r - mid) > THRESHOLD) 1X?q4D"
mergeSort(data, temp, mid + 1, r); \PmM856=ms
else H;FzWcm
insertSort(data, mid + 1, r - mid); P1`YbLER5
QX.U:p5C
for (i = l; i <= mid; i++) { hm1.UE
temp = data; ;*20b@
} ~AF' 6"A
for (j = 1; j <= r - mid; j++) { T7M];@q
temp[r - j + 1] = data[j + mid]; obgO-d9l
} Ti#x62X{
int a = temp[l]; mx2Ov u
int b = temp[r]; 7~H$p X
for (i = l, j = r, k = l; k <= r; k++) { ;$4: &T
if (a < b) { QCfR2Nn}
data[k] = temp[i++]; i \.&8
a = temp; ^4{{ +G)j
} else { 5ai$W`6
data[k] = temp[j--]; tZr_{F@
b = temp[j]; ^j?"0|
} ~y ?v
} \@6V{y'Zo
} #Jfmt~ks'
o;pJjC]
/** hCj8y.X|E(
* @param data mWVq>~
* @param l YD5mJ[1t"2
* @param i os+]ct
*/ }jNVR#D:
private void insertSort(int[] data, int start, int len) { :,'.b|Tl.b
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); U a1Z,~ *
} c{i\F D
} q6P5:@
} 5N|hsfkx
} NRe=O*O
asbFNJG{
堆排序： 6N.MCB^
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package org.rut.util.algorithm.support; LO)QEUG
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import org.rut.util.algorithm.SortUtil; o~VZ%B
`Z (`
/** Ja%isIdh
* @author treeroot X@~R<
* @since 2006-2-2 ~A*$+c(
* @version 1.0 Z&GjG6t
*/ hOm0ND?;1
public class HeapSort implements SortUtil.Sort{ YUlH5rO3
D#X&gE
/* (non-Javadoc) (i]0IYMXy*
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) G-DOI
*/ k_ijVfI9
public void sort(int[] data) { U H6 Jvt
MaxHeap h=new MaxHeap(); #| m*k
h.init(data); JvtbGPz
for(int i=0;i h.remove(); wUzMB]w
System.arraycopy(h.queue,1,data,0,data.length); a &hj|
} pA@BW:#
d-#yN:}0
private static class MaxHeap{ b*cVC^{Dy
0C0ld!>r
void init(int[] data){ 5Ja[p~^L
this.queue=new int[data.length+1]; }<H0CcG
for(int i=0;i queue[++size]=data; H`jvT]
fixUp(size); ^W[3RiG
} Xm^/t#
} r59BBW)M
R|!4klb
private int size=0; ?qczMck_
fZ pUnc
private int[] queue; *l-F
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public int get() { DbH'Qs?z
return queue[1]; <f@ A\
} $Q56~AP
^e1mK4`
public void remove() { &=v5M9GR]
SortUtil.swap(queue,1,size--); 42,K8
fixDown(1); .\|}5J9W
} 5`1p ?
file://fixdown Rc`zt7hbJ
private void fixDown(int k) { + :k"{I
int j; *uvE`4V^Jg
while ((j = k << 1) <= size) { 78FK{Cr
if (j < size %26amp;%26amp; queue[j] j++; C'fQ Z,r-v
if (queue[k]>queue[j]) file://不用交换 Ve\P,.
break; `:EU~4s\
SortUtil.swap(queue,j,k); G'6f6i|<I@
k = j; =-n7/
} ,\0>d}eh!
} bODyJ7=[
private void fixUp(int k) { qJ<Ghd`8v
while (k > 1) { U7d05y'
int j = k >> 1; %jj\w>
if (queue[j]>queue[k]) jI,?*n<
break; =1% <
SortUtil.swap(queue,j,k); r*W&SU9Z
k = j; OJPi*i5*
} c:_dW;MJ0
} ;F\sMf{
>&uR=Yd
} >I;J!{
vK8!V7o~h%
} z]R)Bh
<'z.3@D
SortUtil： GQ=Pkko
8Z(\iZ5Rgj
package org.rut.util.algorithm; EY'48S
5tm:|.`SQ
import org.rut.util.algorithm.support.BubbleSort; -Oc
import org.rut.util.algorithm.support.HeapSort; NUGiDJ+[
import org.rut.util.algorithm.support.ImprovedMergeSort; &3bhK5P
import org.rut.util.algorithm.support.ImprovedQuickSort; BYWs\6vK
import org.rut.util.algorithm.support.InsertSort; YfU6mQ
import org.rut.util.algorithm.support.MergeSort; 'n!kqP
import org.rut.util.algorithm.support.QuickSort; R'p- 4
import org.rut.util.algorithm.support.SelectionSort; P(Q}r7F~(
import org.rut.util.algorithm.support.ShellSort; 3"iJ/Hc}9
}i@%$Ixsn
/** &cB+la\_
* @author treeroot x_.}C%
* @since 2006-2-2 T6Ks]6m_
* @version 1.0 8WMGuv
*/ ue"e><c6:
public class SortUtil { vB1nj<]&z
public final static int INSERT = 1; gatxvR7H
public final static int BUBBLE = 2; Hrj@I?4
public final static int SELECTION = 3; 1|xo4fmV
public final static int SHELL = 4; ,ko0XQBl
public final static int QUICK = 5; _XUDPC(*qz
public final static int IMPROVED_QUICK = 6; /7p1y v
public final static int MERGE = 7; w.R2' WR
public final static int IMPROVED_MERGE = 8; BZAF;j
public final static int HEAP = 9; m15> ^i^W
m$bDWxm#e
public static void sort(int[] data) { Ai.^~#%X
sort(data, IMPROVED_QUICK); tY6QhhuS:
} Cw]bhaG g
private static String[] name={ ThJ`-Ro
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" ^<QF*!
}; QDJe:\n
+]jJ:V
private static Sort[] impl=new Sort[]{ 4+4C0/$Y
new InsertSort(), uE:`Fo=y
new BubbleSort(), fd*<m8
new SelectionSort(), ;0]s:0WD0P
new ShellSort(), I vD M2q8f
new QuickSort(), ]ppws3*Pa
new ImprovedQuickSort(), {^*D5
new MergeSort(), f^9ntos|
new ImprovedMergeSort(), E8PlGQ~z{d
new HeapSort() B5H=#
}; 'w~e>$WI
[eO6H2@=z
public static String toString(int algorithm){ XZ[3v9?&n
return name[algorithm-1]; 1n )&%r
} 9Ts rg
YTYCv7
public static void sort(int[] data, int algorithm) { e? n8S
impl[algorithm-1].sort(data); <Z\j#p:
} "|W``&pM
i4r8146D[
public static interface Sort { b{hdEb
public void sort(int[] data); i@hW" [A
} `beU2N
|g8Q.*"l[
public static void swap(int[] data, int i, int j) { zvHeoM,
int temp = data; /[#5<;
data = data[j]; ]sG^a7Z.X
data[j] = temp; |^$?9Dn9.L
} j<C p&}X
} Sx}61?