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| Template Design pattern or Template Method Design pattern - Implementation [Building a House] |
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| Template Design pattern or Template Method Design pattern - Implementation [Building a House] - Class Diagram |
HouseTemplate.java
public abstract class HouseTemplate
{
// Template method is final so subclasses can't override
public final void buildHouse()
{
buildFoundation();
buildPillars();
buildWalls();
buildWindows();
System.out.println("House is built.");
}
// Methods to be implemented by subclasses
public abstract void buildFoundation();
public abstract void buildPillars();
public abstract void buildWalls();
public abstract void buildWindows();
}
GlassHouse.java
public class GlassHouse extends HouseTemplate
{
@Override
public void buildFoundation()
{
System.out.println("Building foundation with cement,iron rods and sand");
}
@Override
public void buildPillars()
{
System.out.println("Building Pillars with glass coating");
}
@Override
public void buildWalls()
{
System.out.println("Building Glass Walls");
}
@Override
public void buildWindows()
{
System.out.println("Building Glass Windows");
}
}
WoodenHouse.java
public class WoodenHouse extends HouseTemplate
{
@Override
public void buildFoundation()
{
System.out.println("Building foundation with cement,iron rods,sand and wood");
}
@Override
public void buildPillars()
{
System.out.println("Building Pillars with Wood coating");
}
@Override
public void buildWalls()
{
System.out.println("Building Wooden Walls");
}
@Override
public void buildWindows()
{
System.out.println("Building Wooden Windows");
}
}
HousingClient.java
public class HousingClient
{
public static void main( String[] args )
{
System.out.println("Build a WoodenHouse\n");
HouseTemplate houseType = new WoodenHouse();
// using template method
houseType.buildHouse();
System.out.println("************************************************************");
System.out.println("Build a GlassHouse\n");
houseType = new GlassHouse();
houseType.buildHouse();
}
}
Output
Build a WoodenHouse
Building foundation with cement,iron rods,sand and wood
Building Pillars with Wood coating
Building Wooden Walls
Building Wooden Windows
House is built.
************************************************************
Build a GlassHouse
Building foundation with cement,iron rods and sand
Building Pillars with glass coating
Building Glass Walls
Building Glass Windows
House is built.
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