建造模式－简单工厂模式

简单工厂模式，又称静态工厂方法模式

公共接口

package com.javapatterns.simplefactory;

public interface Fruit
{
    void grow();

    void harvest();

    void plant();
}

 具体水果

package com.javapatterns.simplefactory;

public class Apple implements Fruit
{

    public void grow()
    {
    	System.out.println("Apple is growing...");
    }

    public void harvest()
    {
    	System.out.println("Apple has been harvested.");
    }

    public void plant()
    {
        System.out.println("Apple has been planted.");
    }

    public int getTreeAge(){ return treeAge; }

    public void setTreeAge(int treeAge){ this.treeAge = treeAge; }

    private int treeAge;
}

 

package com.javapatterns.simplefactory;

public class Grape implements Fruit
{
    public void grow()
    {
    	System.out.println("Grape is growing...");
    }

    public void harvest()
    {
    	System.out.println("Grape has been harvested.");
    }

    public void plant()
    {
        System.out.println("Grape has been planted.");
    }

    public boolean getSeedless()
    {
        return seedless;
    }

    public void setSeedless(boolean seedless)
    {
        this.seedless = seedless;
    }

    private boolean seedless;
}

 

package com.javapatterns.simplefactory;

public class Strawberry implements Fruit
{
    
    public void grow()
    {
    	System.out.println("Strawberry is growing...");
    }

    public void harvest()
    {
    	System.out.println("Strawberry has been harvested.");
    }

    public void plant()
    {
        System.out.println("Strawberry has been planted.");
    }

}

 

工厂类

package com.javapatterns.simplefactory;

public class FruitGardener
{
    public static Fruit factory(String which) throws BadFruitException
    {
        if (which.equalsIgnoreCase("apple"))
        {
            return new Apple();
        }
        else if (which.equalsIgnoreCase("strawberry"))
        {
            return new Strawberry();
        }
        else if (which.equalsIgnoreCase("grape"))
        {
            return new Grape();
        }
        else
        {
          throw new BadFruitException("Bad fruit request");
        }
    }
    
    public static void main(String []args) throws BadFruitException{
     Fruit apple = factory("apple");
     apple.plant();
     apple.grow();
     apple.harvest();
     
    }
}

 

 

异常类

package com.javapatterns.simplefactory;

public class BadFruitException extends Exception
{
    public BadFruitException(String msg)
    {
        super(msg);
    }
}