SCJP 1.6版考題 114

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. }
 

Which code, inserted at line 16, correctly retrieves a local instance of a Point object?
  A. Point p = Line.getPoint();
  B. Line.Point p = Line.getPoint();
  C. Point p = (new Line()).getPoint();
  D. Line.Point p = (new Line()).getPoint();

解答

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Ans: D

解說:

getPoint是物件成員，要存取這個物件成員要先建立Line物件
Point是在Line中定義，要存取須用Line.Point