[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; OD;F{Hc
} xh|<`>5
int i1=l; &UfP8GE9
int i2=mid+1; KIXp+Z
for(int cur=l;cur<=r;cur++){ ]wm<$+@
if(i1==mid+1) bAS/cuZs
data[cur]=temp[i2++]; Jy?; <
else if(i2>r) }^tW's8
data[cur]=temp[i1++]; B3g#)
else if(temp[i1] data[cur]=temp[i1++]; 8$`$24Wx
else ~KP@wD~
data[cur]=temp[i2++]; 1'4?}0Dok
} +LwwI*;b
} [D_s`'tg
=}UcYC6l
} (bp4ly^
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改进后的归并排序: ^aR^M\38
[]b= xRJM
package org.rut.util.algorithm.support; T7R,6qt
r%\%tz'`j
import org.rut.util.algorithm.SortUtil; eY\w?pT2
v+(-\T\i
/** pPsT,i?
* @author treeroot ~1:_wni
* @since 2006-2-2 ^2C \--=;
* @version 1.0 7.FD16
*/ _?v&\j
public class ImprovedMergeSort implements SortUtil.Sort { 7&&3@96<*#
tE WolO[\
private static final int THRESHOLD = 10; 7A"v:e
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/* 4@r76v}{
* (non-Javadoc) #Oi{7~
* -an~&C5\
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) !U=o<)I
*/ l/-qVAd!q
public void sort(int[] data) { 9 iV_
int[] temp=new int[data.length]; t$z 5m<8
mergeSort(data,temp,0,data.length-1); OF/hD2V
} [P*zm8b
L(o#)I>j
private void mergeSort(int[] data, int[] temp, int l, int r) { Ubm]V{7
int i, j, k; k&lfxb9pd
int mid = (l + r) / 2; pv8vW'G\E
if (l == r) =z!/:M
return; unc8WXW
if ((mid - l) >= THRESHOLD) L<k(stx~
mergeSort(data, temp, l, mid); 46U*70
else RQYD#4|
insertSort(data, l, mid - l + 1); V 5D8z
if ((r - mid) > THRESHOLD) QjOY1Xze
mergeSort(data, temp, mid + 1, r); sB8v:
else MO@XbPZB
insertSort(data, mid + 1, r - mid); {Y|?~ha#
,!dVhG#
for (i = l; i <= mid; i++) { MO%+rf0~w
temp = data; 9#E)H?`g
} |[!7^tU*
for (j = 1; j <= r - mid; j++) { V3(8?Fz.
temp[r - j + 1] = data[j + mid]; Ug )eyu
} b_f"(l8'S
int a = temp[l]; N\anjG
int b = temp[r]; "0LSy x
for (i = l, j = r, k = l; k <= r; k++) { ?Ta<.j
if (a < b) { x Nb7VUV7
data[k] = temp[i++]; ipyc(u6Z5
a = temp; L)c]i'WZ
} else { a66Ns7Rb
data[k] = temp[j--]; (_]D\g~
b = temp[j]; XhUVDmeUMb
} XtqhK"f%
} ,\T7{=ZG\!
} A1n4R
_+,>NJ
/** {r%T_BfY
* @param data n0Qp:_2z
* @param l &v#pS!UOj
* @param i f2u4*X E\
*/ g@Pq<
private void insertSort(int[] data, int start, int len) { Nq1YFI>W
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); ,P%i%YPj
} hP}-yW6]
} 5zOC zm
} 3_8W5J3I
} Qb|@DMq%
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堆排序： Mm;[f'{M)
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package org.rut.util.algorithm.support; "}vxHN#
_2hZGC%&E
import org.rut.util.algorithm.SortUtil; @z^7*#vQv
~G1B}c]
/** KL./
* @author treeroot |K" nSXzk
* @since 2006-2-2 DMOP*;Uk
* @version 1.0 p-xG&CU
*/ +8Y|kC{9"
public class HeapSort implements SortUtil.Sort{ h>F"GR?U_(
Rg^ps
/* (non-Javadoc) ;iW>i8
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) M%WO
*/ OF2W UcQ
public void sort(int[] data) { a"`>J!
MaxHeap h=new MaxHeap(); WL?qulC}h1
h.init(data); }0?XF/e(R
for(int i=0;i h.remove(); c dWg_WBC
System.arraycopy(h.queue,1,data,0,data.length); r'4Dj&9Ac
} Y<V$3h
t37<<5A
private static class MaxHeap{ N<b~,[yCd>
&8I}q]'k
void init(int[] data){ SLRF\mh!L
this.queue=new int[data.length+1]; AiB]A}
for(int i=0;i queue[++size]=data; *Nfotv
fixUp(size); =WHI/|&
} f[ KI T
} ZL:SJ,C
6AoKuT;
private int size=0; IJVzF1vC
[] el4.J,
private int[] queue; lF t^dl^
xz,o Mlw
public int get() { m>RtKCtP
return queue[1]; `X)A$lLr
} [b_qC'K[
1 e]D=2y
public void remove() { Z;,G:@,
SortUtil.swap(queue,1,size--); 0 vYG#S
fixDown(1); |>OBpb
} x4(8 =&Z
file://fixdown tfD7!N{
private void fixDown(int k) { fzA Fn$[
int j; x6^Y&,y9kU
while ((j = k << 1) <= size) { (>AQ\
if (j < size %26amp;%26amp; queue[j] j++; rNurzag
if (queue[k]>queue[j]) file://不用交换 0b['{{X(
break; %~} ,N
SortUtil.swap(queue,j,k); W 1u!&:O
k = j; v*&jA8D
} Y`#6MhFT7
} X%iJPJLza
private void fixUp(int k) { K7@|2;e
while (k > 1) { JPHM+3v
int j = k >> 1; evpy%/D
if (queue[j]>queue[k]) uGF{0)0g
break; t2YB(6w+xg
SortUtil.swap(queue,j,k); gVe]?Jva`
k = j; t\}_WygN
} <EQaYZY=
} z;y{QO
s;..a&C'
} R7K`9 c1f6
Fq_>}k@fI
} ,LlYRj 5
#oR`_Dm)P
SortUtil： \XYidj
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package org.rut.util.algorithm; 2r;h">
ca3SE^
import org.rut.util.algorithm.support.BubbleSort; q"6$#o{~U
import org.rut.util.algorithm.support.HeapSort; u!&T}i:
import org.rut.util.algorithm.support.ImprovedMergeSort; 5423Ky<
import org.rut.util.algorithm.support.ImprovedQuickSort; wlsx|
import org.rut.util.algorithm.support.InsertSort; ;^u,[d
import org.rut.util.algorithm.support.MergeSort; _C(fz CK
import org.rut.util.algorithm.support.QuickSort; :U *8S\$
import org.rut.util.algorithm.support.SelectionSort; n#}~/\P6
import org.rut.util.algorithm.support.ShellSort; ^#Mp@HK
N/'
/** .ZV='i()X
* @author treeroot Srz8sm;
* @since 2006-2-2 wGw~ F:z
* @version 1.0 }+bo?~2E&
*/ =mF"D:s*
public class SortUtil { >3pT).wH|M
public final static int INSERT = 1; TOF V`7q;3
public final static int BUBBLE = 2; RwYFBc
public final static int SELECTION = 3; ?{jey_]M
public final static int SHELL = 4; S3i p?9
public final static int QUICK = 5; #oFyi @U
public final static int IMPROVED_QUICK = 6; YM6 J:89
public final static int MERGE = 7; FRajo~H
public final static int IMPROVED_MERGE = 8; UCK;?]
public final static int HEAP = 9; 0[M2LF!m
|Olz h63k:
public static void sort(int[] data) { `/'p1?Z"
sort(data, IMPROVED_QUICK); 1G.?Y3DC<
} Z^z{, u;!
private static String[] name={ 2~l7WW+lx,
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" F_9 4k
}; rsLkH&aM
PH%'^YAl7
private static Sort[] impl=new Sort[]{ #ACT&J
new InsertSort(), Rd5-ao4
new BubbleSort(), EI7n|X a1q
new SelectionSort(), [3s-S+n @
new ShellSort(), GlTpK^.
new QuickSort(), Kw$@_~BJ6
new ImprovedQuickSort(), S9]I[4
new MergeSort(), ~]QQaP
new ImprovedMergeSort(), L\UGC%]9
new HeapSort() "]kzt ux
}; 4}k@p>5v'
!02y'JS1
public static String toString(int algorithm){ hc[J,yG
return name[algorithm-1]; '|Bk}pl7
} :Yn.Wv-
6i~|<vcSP
public static void sort(int[] data, int algorithm) { /9&!u )+
impl[algorithm-1].sort(data); ygH)U.
} /} z9(
s]OZ+^Z
public static interface Sort { rks"y&&Nc
public void sort(int[] data); oA@M =
} y<w_>O
uR{)%udu
public static void swap(int[] data, int i, int j) { :aomDK*
int temp = data; i{TPf1OY`M
data = data[j]; J]XLWAM
data[j] = temp; t!SxJB e
} j6RV{Lkr_
} +_$s9`@]6