Which code, Inserted at line 16, Correctly retrieves a local instance of a Point object?

Given:

10. class Line {

11. public class Point { public int x,y;}

12. public Point getPoint() { return new Point(); }

13. }

14. class Triangle {

15. public Triangle() {

16. // insert code here

17. }

18. }

A. Point p = Line.getPoint();

B. Line.Point p = Line.getPoint();

C. Point p = (new Line()).getPoint();

D. Line.Point p = (new Line()).getPoint();

Answer: D

Explanation :

getPoint() method is declared inside Line Class and outside Point class.So in-order to call getPoint() method we must first instantiate Line Class object . Therefore (new Line()).getPoint(); .

The reference variable of inner Point class must be declared in the form OuterClass.InnerClass ,ie Line.Point p ,Since we instantiate inner class Point object in Triangle class constructor .

Output is x and y integer variables of Point object is initialized with Zero and Point Object reference is returned to Triangle Constructor .And the correct Syntax to do so is Option D .

Here are the some other ways to Instantiate Inner class objects outside Outer Class :

new MyOuter().new MyInner(); or outerObjRef.new MyInner();