[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; XPfheV G
} ')82a49eA
int i1=l; J};=)xLX;
int i2=mid+1; Fs 95^T
for(int cur=l;cur<=r;cur++){ d#>iFD+
if(i1==mid+1) (DTXc2)c
data[cur]=temp[i2++]; z<jH{AU
else if(i2>r) %-Oo92tP
data[cur]=temp[i1++]; p OO4fc
else if(temp[i1] data[cur]=temp[i1++]; 3o.9}`/
else i[N=.
data[cur]=temp[i2++]; @@pI>~#zh
} =hq+9 R8=
} ?(2^lH~6h
QG8X{'
} T@?uA*J
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改进后的归并排序: 277Am*2
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package org.rut.util.algorithm.support; [39
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import org.rut.util.algorithm.SortUtil; Ra-%,cS
RKtU@MX49
/** .DN)ck:e;
* @author treeroot Y| 2Gj(*8
* @since 2006-2-2 J5j3#2l
* @version 1.0 nm{J
*/ w\{oOlE
public class ImprovedMergeSort implements SortUtil.Sort { 56l1&hp8In
haoQr)S
private static final int THRESHOLD = 10; [[A}MF*@
'^ob3N/Y [
/* xL#UMvZ>;h
* (non-Javadoc) @";zM&
* upefjwm
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 7:P+S%ZL
*/ qf?X:9Wt
public void sort(int[] data) { ;%V)lP"o
int[] temp=new int[data.length]; E%np-is{1
mergeSort(data,temp,0,data.length-1); -+,3aK<[
} Jd-u?
]IeyJ
private void mergeSort(int[] data, int[] temp, int l, int r) { 96]!*}
int i, j, k; 3{FUFx
int mid = (l + r) / 2; L>>Cx`ASi
if (l == r) N~0~1 WQn
return; N[j*Q 8X_
if ((mid - l) >= THRESHOLD) a%NSL6
mergeSort(data, temp, l, mid); 0sGAC
else G Z~W#*|V
insertSort(data, l, mid - l + 1); [W,}&
if ((r - mid) > THRESHOLD) |4?O4QN
mergeSort(data, temp, mid + 1, r); g|V md
else s;!Tz)
insertSort(data, mid + 1, r - mid); T$vDw|KSVP
-V'h>K
for (i = l; i <= mid; i++) { (I0QwB
temp = data; 8TV "9{ n
} ?o883!&v
for (j = 1; j <= r - mid; j++) { xa]e9u%
temp[r - j + 1] = data[j + mid]; 9%6W_0>
} %5rC`9^
int a = temp[l]; bMDj+i
int b = temp[r]; XmI63W*
for (i = l, j = r, k = l; k <= r; k++) { yf@DaIG
if (a < b) { Unc_e
data[k] = temp[i++]; -JwwD6D
a = temp; 2|:xb9#
} else { e0cVg
data[k] = temp[j--]; T(4OPiKu
b = temp[j]; A2{s?L,
} [)KLmL%
} u~\I
} s$PPJJT{b
XPd@>2
/** r.#"he_6!.
* @param data _+NM<o#A
* @param l YfZ96C[a
* @param i f>kW\uC
*/ i?D KKjN$
private void insertSort(int[] data, int start, int len) { CF0i72ul5
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); jp|1S^b
} *@SZ0
} Im<(
} d^W1;0
} ,'z=cB`+o
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堆排序： `S+B-I0
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package org.rut.util.algorithm.support; m%[`NP (
XJ{b_h#N
import org.rut.util.algorithm.SortUtil; o'auCa,N
4 /Q4sE~<
/** ZCuLgCP?Z
* @author treeroot e=#'rDm
* @since 2006-2-2 >cYYr@S
* @version 1.0 qOi"3_
*/ MlmdfO%Y
public class HeapSort implements SortUtil.Sort{ vpL3XYs`
k<i#agq
/* (non-Javadoc) LktH*ePO
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) V3t;V-Lkt
*/ nLcOz3h
public void sort(int[] data) { K%iA-h
MaxHeap h=new MaxHeap(); KVA~|j B
h.init(data); hH])0C
for(int i=0;i h.remove(); &m8Z3+Ea
System.arraycopy(h.queue,1,data,0,data.length); Dg~L"
} Z@d(0 z
[44C`x[8M+
private static class MaxHeap{ V9cKl[
=}^J6+TVL
void init(int[] data){ P{ HYZg
this.queue=new int[data.length+1]; +q-/~G'
for(int i=0;i queue[++size]=data; K]s*rPT/,
fixUp(size); /lqVMlz\77
} n,vs(ZL:
} ?X5Y8n]y\h
}=T=Z#OgH
private int size=0; `iT{H]po
IyJHKDFk
private int[] queue; e_Un:r@)
B?pNF+?'z
public int get() { T**v!Ls
return queue[1]; 4Ow0g-{
} IqrT@jgN-
z [9f
public void remove() { '#Pg:v_
SortUtil.swap(queue,1,size--); /.>8e%)
fixDown(1); {M&Vh]
} "2 "gTS
file://fixdown i?0+f}5<p
private void fixDown(int k) { k/]4L!/ T
int j; ] lONi
while ((j = k << 1) <= size) { e|2@z-Sp-
if (j < size %26amp;%26amp; queue[j] j++; hiBZZ+^[
if (queue[k]>queue[j]) file://不用交换 tQSJ"Q
break; >uR0Xs;V
SortUtil.swap(queue,j,k); =QQTHL{3
k = j; %S9YjMR@
} &U7INUL
} uW4wTAk;qh
private void fixUp(int k) { }X?M6;$)
while (k > 1) { wcW8"J'AH
int j = k >> 1; RW I7eC
if (queue[j]>queue[k]) 5N.-m;s
break; 6! .nj3$*
SortUtil.swap(queue,j,k); ) u Sg;B4
k = j; q"C(`S.@
} i$CN{c*
} 7>,(QHl
pS6p}S=1]
} TpIx!R9
ExKjH*gn
} 8DLj?M>N
5%)<e-
SortUtil： HmQ.'
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package org.rut.util.algorithm; %!X9>i>
[3|&!:4g6
import org.rut.util.algorithm.support.BubbleSort; Z(c3GmY
import org.rut.util.algorithm.support.HeapSort; -{O>'9'1A
import org.rut.util.algorithm.support.ImprovedMergeSort; JVxGS{Z
import org.rut.util.algorithm.support.ImprovedQuickSort; lo< t5~GQ
import org.rut.util.algorithm.support.InsertSort; }fT5(+ Wo
import org.rut.util.algorithm.support.MergeSort; ]qpLaBD
import org.rut.util.algorithm.support.QuickSort; e:uk``\
import org.rut.util.algorithm.support.SelectionSort; ~dz,eB
import org.rut.util.algorithm.support.ShellSort; 2uZ4$_
6>=yX6U1q^
/** fWk,k*Z9
* @author treeroot ta+MH,
* @since 2006-2-2 L5j%4BlK/
* @version 1.0 p()#+Xy
*/ lC8Z@wkjO
public class SortUtil { 'JK"3m}nT
public final static int INSERT = 1; ]9]o*{_+(f
public final static int BUBBLE = 2; oo4aw1d
public final static int SELECTION = 3; :/<SJ({q
public final static int SHELL = 4; Q}6!t$Vk
public final static int QUICK = 5; 1O,:fTG<
public final static int IMPROVED_QUICK = 6; oqUF_kh
public final static int MERGE = 7; (<KFA,
public final static int IMPROVED_MERGE = 8; w 8BSY
public final static int HEAP = 9; W{W8\
1LZ[i89&%
public static void sort(int[] data) { ~;S
sort(data, IMPROVED_QUICK); DV{0|E
} }N,$4h9Dj
private static String[] name={ +,|aIF
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" K{EDmC
}; Swr 8
*'to#_n&W
private static Sort[] impl=new Sort[]{ D`NPU
new InsertSort(), kWMz;{I5*w
new BubbleSort(), 7U647G(Sg
new SelectionSort(), OUFx M
new ShellSort(), 1"yr`,}?8r
new QuickSort(), n4sO#p)'
new ImprovedQuickSort(), r?2EJE2{V
new MergeSort(), ;k|U2ajFJ
new ImprovedMergeSort(), D8 BmC
new HeapSort() {3`cSm6c
}; Em ;2fh
)eD9H*mq
public static String toString(int algorithm){ (J 1:J
return name[algorithm-1]; GTuxMg`
} nr]:Y3KyxX
VSjt|F)t
public static void sort(int[] data, int algorithm) { (|9t+KP
impl[algorithm-1].sort(data); G$mAyK:
} 9_-6Lwj6t
8yDe{
public static interface Sort { Aw$+Ew[8 2
public void sort(int[] data); ~J:]cy)Q
} cw"Ou%
s3sPj2e{
public static void swap(int[] data, int i, int j) { 9T#${NK
int temp = data; %EH{p@nM&-
data = data[j]; W+Q^u7K
data[j] = temp; SxI-pH'
} NH'Dz6K5
} MAQ(PIc>T