[Java] Basic Learning Example

Long time no update, lazy, the fight!
1, this is a basic file operation, the implementation of the file read, write a number of operations
Package trying;
Import java.io.*;

/**
* @author gooing
*/
public class Filerw {
Private file F = new file ("D:\\j2\\a.txt");
public int Getnum () {
int i =-1;
try{
String stri= "";
BufferedReader in = new BufferedReader (new FileReader (f));
while ((Stri=in.readline ())!=null) {
i = Integer.parseint (Stri.trim ());
}
In.close ();
}catch (Exception e) {
E.printstacktrace ();
}
return i;
}
public void Setnum () {
int i = Getnum ();
i++;
try{
PrintWriter out=new PrintWriter (New BufferedWriter) (New FileWriter (F,false));
Out.write (string.valueof (i));
May be the reason for the encoding, if you write int directly, there will be Java encoding and Windows encoding confusion, so write here is a string
Out.close ();
}catch (Exception e) {
E.printstacktrace ();
}
}
public static void Main (string[] args) {
Filerw FRW = new Filerw ();
for (int i =0;i<100; i++) {
Frw.setnum ();
System.out.println (Frw.getnum ());
}
}
}

2, the following is an example of learning the factory model
Garden.java implements an abstract garden factory where you can get the garden's central plants and surrounding plants;
Of course, for different gardens, the central plant and the surrounding plants are not the same
Package pkgfactory;

/**
* @author gooing TODO To change the template for this generated type
* Comment Go to window-preferences-java-code style-code
* Templates
*/
Public abstract class Garden {
Public abstract Plant getcenter ();
Public abstract Plant Getborder ();

public void Memo () {
System.out.println ("centerplant:" + getcenter (). GetName ());
System.out.println ("borderplant:" + getborder (). GetName ());
System.out.println ("---------------------");
}
}

Plant.java realizes the basic abstraction of plants in the garden, where only one plant name attribute is provided.
Package pkgfactory;
public class Plant {
Public plant (String name) {
THIS.name = name;
}

Public String GetName () {
return name;
}

private String name;
}

Vergarden.java and Flowergarden.java each realized a vegetable garden and gardens
Package pkgfactory;
public class Veggarden extends Garden {
Public Plant Getcenter () {
return new plant ("wheat");
}

Public Plant Getborder () {
return new plant ("carrot");
}
}

Package pkgfactory;
public class Flowergarden extends Garden {
Public Plant Getcenter () {
return new plant ("Rose");
}

Public Plant Getborder () {
return new plant ("Juhua");
}
}

Gardener.java is a driver of this routine
Package pkgfactory;
public class Gardener {
public static void Main (string[] args) {
Garden G1 = new Flowergarden ();
Garden g2 = new Veggarden ();
G1.memo ();
G2.memo ();
}
}