What is the outcome of below code Output class?class Shape

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What is the outcome of below code Output class?

class Shape 
{
	public int area()
        {
		return 2;
	}
}

class Square extends Shape 
{
	public int area()
        {
		return 5;
	}
}

class Rectangle extends Shape 
{
	public int area()
        {
		return 7;
	}
}

public class Output
{
   public static void main(String[] args)
   {
	Shape obj = new Shape();
	Square obj0 = new Square();
    	Rectangle obj1 = new Rectangle();
	obj1 = (Rectangle)obj;
	System.out.println(obj0.area());
   }
}

1. Compilation Error
2. Runtime Error
3. Default value
4. 7
5. 5

Correct Option: B

ClassCastException is thrown as we cannot assign parent object to child variable.

Exception in thread "main" java.lang.ClassCastException: Shape cannot be cast to Rectangle
	at Output.main(Output.java:32)