A.java
class A
{
	public static void main(String args[])
	{
		A a=new A();
		try 
		{
			a.roots(2,-2,3);
	
			
		}catch(NotRootsException x)
		{
			System.out.println(x.getMessage());
			System.out.println("no roots exits");
		}
		catch(NotsException e)
		{
			System.out.println(e.getMessage());
			System.out.println("no roots exits");
		}
	}
	void roots(int a,int b,int c) throws NotRootsException,NotsException
	{
  
	  if(a<0)throw new NotRootsException("a<0");
      if(b<0)throw new NotsException("b<0");
	}

}
NotRootsException.java 
class NotRootsException extends Exception{
	
	public NotRootsException(String s)
	{
		super(s);
	}
}
NotsException.java
class NotsException extends Exception{
	
	public NotsException(String s)
	{
		super(s);
	}
}