单例模式+工厂模式的简单示例

[align=left]1.接口[/align]
[align=left] [/align]

package com.fzw.ms;

public interface Food {
public void eat();
}

2.实现类一：

package com.fzw.ms;

public class Cake implements Food {

public void eat() {
System.out.println("------Cake.eat()----------");

}

}

3.实现类二：

package com.fzw.ms;

public class Pissa implements Food {

public void eat() {
System.out.println("------Pissa.eat()----------");

}

}

4.建立工厂类：

package com.fzw.ms;

public class FoodFactory {
private FoodFactory() {
};

private static final FoodFactory ff = new FoodFactory();

public static FoodFactory getInstance() {
return ff;
}

public Food makefood(int i) {
if (i == 1) {
Food cake = new Cake();
return cake;
}
if (i == 2) {
Food pissa = new Pissa();
return pissa;
}
return null;

}

public static void main(String[] args) {
FoodFactory.getInstance().makefood(1).eat();
}
}

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