[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; q1;}~}W;z4
} I?.$
int i1=l; 7xb z)FI
int i2=mid+1; ^^qB=N[';
for(int cur=l;cur<=r;cur++){ ,q]Wi#
if(i1==mid+1) hCQzD2
data[cur]=temp[i2++]; Z}5;K"T/
else if(i2>r) 6HW<E~G'6
data[cur]=temp[i1++]; \`Db|D?oy
else if(temp[i1] data[cur]=temp[i1++]; y<.0+YL-e+
else HcXyU/>D
data[cur]=temp[i2++]; L 5J=+k,
} }H&NR?Ax
} ]s?BwLU6
yS_,lS
} 2M3.xUS
> nDx)!I
改进后的归并排序: A% 9TS/-p
q+>J'UGb
package org.rut.util.algorithm.support; Xm8 1axyf
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import org.rut.util.algorithm.SortUtil; c^S^"M|
9[N+x2q
/** lX/6u E_%
* @author treeroot dq%7A=-
* @since 2006-2-2 ,3Y~ #{,i
* @version 1.0 u.YPb@
*/ g4cmYg3
public class ImprovedMergeSort implements SortUtil.Sort { 4\H:^U&
J*Dj`@`4`g
private static final int THRESHOLD = 10; -9Wx;u4]o
@%q0fj8b
/* lR\=] ]7I>
* (non-Javadoc) HaXlc8
* (Hb i+IHV
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 8zS't2 u
*/ AdxCP\S&
public void sort(int[] data) { !([Q1r{u
int[] temp=new int[data.length]; br*L|s\P\9
mergeSort(data,temp,0,data.length-1); JhRXfIK>{
} 5M4mFC6
rlqn39
private void mergeSort(int[] data, int[] temp, int l, int r) { RUC V!L
int i, j, k; *lRP ZN
int mid = (l + r) / 2; /Y_F"GQ
if (l == r) L']EYK5
return; ))^rk6
if ((mid - l) >= THRESHOLD) oqH811
mergeSort(data, temp, l, mid); 2T3v^%%j
else {|c <8
insertSort(data, l, mid - l + 1); |v#N
if ((r - mid) > THRESHOLD) T%A45BE V
mergeSort(data, temp, mid + 1, r); :[z=u
else KY9sa/xO
insertSort(data, mid + 1, r - mid); fo9O+e s
F/sXr(7
for (i = l; i <= mid; i++) { jFf2( AR
temp = data; ( >zXapb2
} /bv`_>
for (j = 1; j <= r - mid; j++) { <GC<uB |p
temp[r - j + 1] = data[j + mid]; OiH tobM
} 1H`T=:P?
int a = temp[l]; 6*u#^">,<
int b = temp[r]; t33/QW r
for (i = l, j = r, k = l; k <= r; k++) { uF_gfjR[m
if (a < b) { -e_IDE
data[k] = temp[i++]; _IBIx\F
a = temp; &@u;xc| v
} else { -fFM-gt^t
data[k] = temp[j--]; o6,$;-?F_
b = temp[j]; jE|Ju:}&
} D[U[D
} - ?_aYJ
} 3CK4a,]Dm
_doX&*9u
/** dIgaw;Ch]
* @param data /_}xTP"9
* @param l GzxtC&
* @param i ,R]hNjs-{
*/ S G|``}OA
private void insertSort(int[] data, int start, int len) { Tu2BQ4\[
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); 2mN>7Tj:
} WW82=2rJ9
} 7t=e"|^
} m,NUNd#)\
} ~9c?g(0
*@[DG)N
堆排序： "W$,dWF
fx(^}e
package org.rut.util.algorithm.support; =$;i
6<jh0=$
import org.rut.util.algorithm.SortUtil; 4^vEMq8lB
;M}'\.
/** d%VG@./xq
* @author treeroot v1%rlP
* @since 2006-2-2 )X2=x^u*U
* @version 1.0 u~FXO[b
*/ jH#Tt;
public class HeapSort implements SortUtil.Sort{ ykcW>h
6!7LgM%4
/* (non-Javadoc) }w .[ZeP
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Y^$^B,
*/ o"dX3jd
public void sort(int[] data) { +X6xCE
MaxHeap h=new MaxHeap(); P6V_cw$
h.init(data); 8wz%e(
for(int i=0;i h.remove(); t:NTk(
System.arraycopy(h.queue,1,data,0,data.length); vn<z\wVbf
} g]?&qF}
{E`[`Kf
private static class MaxHeap{ m?bd6'&FR
YSERQo
void init(int[] data){ #12
this.queue=new int[data.length+1]; nTxeV%
for(int i=0;i queue[++size]=data; *X- 6]C
fixUp(size); 0Ou;MU*v
} H1X38
} bE:oF9J?
Kcv7C{-/
private int size=0; V)#se"GV
lj0"2@z3"E
private int[] queue; VL=.JwK
;1PnbU b
public int get() { _V\rs{ 5
return queue[1]; #T:#!MKa
} >MD['=J[d
Si#I^aF`%
public void remove() { KPO?eeT.WZ
SortUtil.swap(queue,1,size--); ZYDLl8
fixDown(1); a_Y*pOu
} dU%Q=r8R
file://fixdown ?oF+?l
private void fixDown(int k) { EfHo1Yn&
int j; SXkUtY$
while ((j = k << 1) <= size) { 1vKc>+9
if (j < size %26amp;%26amp; queue[j] j++; (n:d {bKV
if (queue[k]>queue[j]) file://不用交换 _Kdqa%L !
break; :L gFd
SortUtil.swap(queue,j,k); 1xN6V-qk
k = j; C-!!1-Eq?:
} N>qOiw[
} a9S0glbwf
private void fixUp(int k) { 'q%56WAJ
while (k > 1) { pleLdGq
int j = k >> 1; xL8r'gV@
if (queue[j]>queue[k]) 6UK{0\0
break; mYLqT$t.+
SortUtil.swap(queue,j,k); `B6~KZ
k = j; l_tr,3_w
} \HX'^t`
} W" >[sn|
^Xv_y+
} ?blF6Kl$
F:nhSd
} Ibt~e4f
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SortUtil： PI_MSiYQ
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package org.rut.util.algorithm; u!I Es
sXHrCU
import org.rut.util.algorithm.support.BubbleSort; T"7Ue
import org.rut.util.algorithm.support.HeapSort; Hl`S\
import org.rut.util.algorithm.support.ImprovedMergeSort; tPu0r],`o
import org.rut.util.algorithm.support.ImprovedQuickSort; sb"z=4
import org.rut.util.algorithm.support.InsertSort; ?+#|h;M8
import org.rut.util.algorithm.support.MergeSort; a@(4X/|
import org.rut.util.algorithm.support.QuickSort; z}I=:
import org.rut.util.algorithm.support.SelectionSort; $:IOoS|e
import org.rut.util.algorithm.support.ShellSort; ~ [L4,q
l&3f<e
/** NIZN}DnP
* @author treeroot %Jy0?WN
* @since 2006-2-2 ]WlE9z7:8
* @version 1.0 B-Bgk
*/ ]D(!ua5|x`
public class SortUtil { thG;~W
public final static int INSERT = 1; XaT9`L<
public final static int BUBBLE = 2; )~/;Xl#b-
public final static int SELECTION = 3; 0>@D{_}s
public final static int SHELL = 4; h| q!Qsnj'
public final static int QUICK = 5; 6*yt^[W
public final static int IMPROVED_QUICK = 6; Qtj.@CGB
public final static int MERGE = 7; vv='.R, D
public final static int IMPROVED_MERGE = 8; =!}n .
public final static int HEAP = 9; Uedzt
^s*j<fH
public static void sort(int[] data) { anDwv }
sort(data, IMPROVED_QUICK); -|E|-'
} R^8L^8EL
private static String[] name={ D7q%rO|F'
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" M"QT(u+
}; &!/E&e$_
"rhU2jT=c
private static Sort[] impl=new Sort[]{ A4;EtW+F
new InsertSort(), z&fXxp
new BubbleSort(), -+vA9,pI
new SelectionSort(), W(jXOgs+_
new ShellSort(), <}e2\x
new QuickSort(), fTQ_miAlP
new ImprovedQuickSort(), IQn|0$':Z
new MergeSort(), 8MUY
new ImprovedMergeSort(), +um Ua
new HeapSort() L~x PIu
}; pkWJb!
l!r2[T]I@7
public static String toString(int algorithm){ &f12Q&jY7
return name[algorithm-1]; &T7|f!y
} p)_v.D3i
J\7ukm"9
public static void sort(int[] data, int algorithm) { P-B3<~*i!
impl[algorithm-1].sort(data); ;F>$\"aG
} %N((p[\H
O>8|Lc
public static interface Sort { LOm*=MVex
public void sort(int[] data); ]J<2a`IK!
} bbGSh|u+P
luA k$Es
public static void swap(int[] data, int i, int j) { TVaD',5_V%
int temp = data; LJ^n6 m|_
data = data[j]; kjCXP
data[j] = temp; &)(>e}es
} #jY\l&E
} 9 Vn