What is the outcome of below Square_Shape

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What is the outcome of below Square_Shape_Example class?

class Shape 
{
	public int area()
        {
		return 1;
	}
}

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

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

1. 0
2. Compilation Error
3. Runtime Error
4. Default value
5. 5

Correct Option: E

Child object can be assigned to parent variable without change in behaviour.