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

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What is the outcome of below code box class?

class Shape 
{
	public int area()
        {
		return 0;
	}
}

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

class Rectangle extends Shape 
{
	public int area()
        {
		return 9;
	}
}

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

1. Compilation Error
2. Runtime Error
3. Default value
4. 9
5. None of these

Correct Option: D

The method of the child class object is accessed. When we reassign objects, the methods of the latest assigned object are accessed.