设计模式之模板方法模式

模式介绍

定义一个操作中的算法的骨架，而将一些步骤延迟到子类中。 模板方法使得子类可以不改变一个算法的结构即可重定义该算法的某些特定步骤。

代码

public abstract class HouseTemplate {
     public final void buildHouse() {
         buildFoundation();
         buildPillars();
         buildWalls();
         buildWindows();
         System.out.println("House is built.");
     }
     private void buildWindows() {
         System.out.println("Building Glass Windows");
     }
     public abstract void buildWalls();
     public abstract void buildPillars();
     private void buildFoundation() {
         System.out.println("Building foundation with cement,iron rods and sand");
     }
 }

public class WoodenHouse extends HouseTemplate {
    @Override
    public void buildWalls() {
        System.out.println("Building Wooden Walls");
    }
    @Override
    public void buildPillars() {
        System.out.println("Building Pillars with Wood coating");
    }
}

public class GlassHouse extends HouseTemplate {

	@Override
	public void buildWalls() {
		System.out.println("Building Glass Walls");
	}

	@Override
	public void buildPillars() {
		System.out.println("Building Pillars with glass coating");
	}

}

public class HousingClient {

	public static void main(String[] args) {
		
		HouseTemplate houseType = new WoodenHouse();
		
	
		houseType.buildHouse();
		System.out.println("************");
		
		houseType = new GlassHouse();
		
		houseType.buildHouse();
	}

}