JAVA 异常处理练习

//仅作为学习笔记

/* 
异常练习1
*/

class NoValueException extends Exception
{
	NoValueException(String msg)
	{
		super(msg);
	}
}


interface Shape
{
	void getArea();
}

class Rec implements Shape
{
	private int len , wid;

	Rec(int len , int wid) throws NoValueException
	{
		if( len <= 0 || wid <= 0)
			throw new NoValueException("出现非法值！");
			
		this.len = len;
		this.wid = wid;
	}

	public void getArea()
	{


		System.out.println(len*wid);
	}

}

class ExceptionTest
{
		public static void main(String [] args)
		{
			try
			{
				Rec r = new Rec(-3,4);
				r.getArea();	
			}
			catch ( NoValueException e)
			{
				System.out.println(e.toString());
			}

			System.out.println("Over");

		}		
}

/* 
异常练习2
*/

class NoValueException extends RuntimeException
{
	NoValueException(String msg)
	{
		super(msg);
	}
}


interface Shape
{
	void getArea();
}

class Rec implements Shape
{
	private int len , wid;

	Rec(int len , int wid) //throws NoValueException
	{
		if( len <= 0 || wid <= 0)
			throw new NoValueException("出现非法值！");
			
		this.len = len;
		this.wid = wid;
	}

	public void getArea()
	{


		System.out.println(len*wid);
	}

}

class ExceptionTest
{
		public static void main(String [] args)
		{
				Rec r = new Rec(-3,4);
				r.getArea();	
			
			System.out.println("Over");

		}		
}