Design Patterns Simple Factory, factory method, abstract factory

1. Simple Factory mode

As an example:

Small z likes to eat fruit (Fruit) more like to drink juice (juice), like three kinds of fruit melon (hami melon), banana (banana), peach (peach) use simple factory to achieve small Z drink Juice dream

Uml

First choose fruit (Fruit):

/*
* A way to get fruit and get a juice squeeze
*/
Public interface Fruit {
public void Getjuice ();
}

Cantaloupe:

/*
* Fruit juice function is realized with cantaloupe
*/

public class Hamimelon implements Fruit {

@Override
public void Getjuice () {
System.out.println ("Hamimelon Juice");

}

}

Banana:

/*
* Fruit juice function with banana
*/

public class Banana implements Fruit {

@Override
public void Getjuice () {
System.out.println ("Banana Juice");

}

}

Peach:

/*
* Fruit juice function with peach
*/

public class Peach implements Fruit {

@Override
public void Getjuice () {
System.out.println ("Peach Juice");

}

}

Processing plant:

Package simplefactory;
/*
* This fruit processing plant is to squeeze fruit into juice
*/

public class Fruitfactory {

Public Fruit createjuice (int choose) {

Switch to select the appropriate juice flavor
System.out.println ("1 Peachjuice 2 Hamimelon 3 Banana");
Switch (choose) {
Case 1:
return new Peach ();
Case 2:
return new Hamimelon ();
Case 3:
return new Banana ();
}
return null;
}

}

Test class:

Test program
public class Testdemo {

public static void Main (string[] args) {
Fruitfactory ff = new Fruitfactory ();
Fruit f = ff.createjuice (1);
F.getjuice ();
}

}

Output:

1 Peachjuice 2 Hamimelon 3 Banana
Peach Juice

2. Factory method

Small Z is a kind of juice under the distinction of a phase so

Design Patterns Simple Factory, factory method, abstract factory