public class MicoroWaveOven {
    private String   doorState=null;
    private boolean isPowerOn=false;
    private Food cookingFood=null;
    
    public void fire(Food food){
        if(!this.isPowerOn) return;
        if(food==null) return;
        
        if(this.doorState.equals("opend")){
            alert("请先关门!");
            return;            
        }
        
        if(food.hasShell()){
            alert("本产品不能烹饪带壳食物!");            
            openDoor();
            return;
        }
        
        this.cookingFood=food;
        
        //to-do:另启动线程加热食物
    }
    
    public void cookFood(){
        if(this.cookingFood==null) return;
        
        while(cookingFood.getState()!=FoodState.COOKED){
            cookingFood.changeState();
        }
        
        openDoor();
    }
    
    public void openDoor(){
        if(cookingFood==null
          ||cookingFood.getState()==FoodState.COOKED){
            this.doorState="opened";        
        }else{
            alert("食物正在加热中请稍后");
        }            
    }
    
    public void on(){
        this.isPowerOn=true;
    }
    
    public void off(){
        this.isPowerOn=false;
    }
    
    public void closeDoor(){
        this.doorState="closed";
    }
    
    public boolean isDoorOpen(){
        return this.doorState.equals("opened");
    }
    
    public boolean isDoorClose(){
        return this.doorState.equals("closed");
    }
    
    public void alert(String message){
        System.out.println("警告:"+message);
    }
}

interface Food{    
    public boolean   hasShell();    
    public void      changeState();
    public FoodState  getState();
}

enum FoodState{
    RARE,
    HALF_RARE,
    COOKED,
    FIRED
}

------解决方案--------------------
看着很有意思，请指教！
class Microwave {  
	int power;
	int size;
	int container;
	int color;
	boolean open
	double time [] = {1,2,3,4,5,6,7,8,9,};
	String model;
       Person p;



	public double timeMenu(double time) {
		for(int i=0; i<time.length(); i++;) {
			System.out.println("已工作时间：" + time[i] + "min");        
               heating(new Food());
		}
	}

	public void heating(Food food) {
		System.out.println("食物正在加热");
		if(p.normal) {
			System.out.println("I couldn't open the door");
		} else {
			System.out.println("疯子");
		}
	}
	
}


class Food {
	 boolean sikn_food = true;
	 int weigth;
	 int height;
	 int size;
	 int type;
}  


public class Person {
	boolean normal = true;

	public boolean judgeFood(Food food) {
		eye();
	}

	public void eye(Food food){
		if(food == skin_food) {
			System.out.println("这是有皮的食物，不可以在微波炉中加热");
			break;
		} else if(food != skin_food) {
			System.out.println("这是无皮的食物，可以在微波炉中加热");
			handTime();
		}
	}

	public void handTime() {
		timeMenu();
		
	}

	public static void main(String[] args) {
		Person p = new Person();
		p.judgeFood();
}



------解决方案--------------------
关于冰箱的问题说的不清楚，我发表一下我对微波炉的看法，我觉得它真的能看出一个程序员的水平高低
我们来分析一下这个问题
用java写一个微波炉，注意物品正加热时不能开门，带皮带壳食物不能被加热。