Ikk：新頁面: 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. ...

2013-03-30T04:20:07Z

新頁面: 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. ...

新頁面

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();

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<span style="font-size:medium;">解答</span>

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<span style="font-size: medium;">Ans: D </span>

<span style="font-size:medium;"> 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

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{{SCJP 1.6版考題講解}}

SCJP 1.6版考題 114 - 修訂歷史

Ikk：新頁面: 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. ...