单项选择题
A. Line l = new Line() ; l.Point p = new l.Point();
B. Line.Point p = new Line.Point();
C. The Point class cannot be instatiated at line 15.
D. Point p = new Point();
单项选择题 Given: 11. public static void main(String[] args) { 12. Object obj = new int[] { 1, 2, 3 }; 13. int[] someArray = (int[])obj; 14. for (int i : someArray) System.out.print(i + " "); 15. } What is the result? ()
多项选择题 Given: 10. interface Jumper { public void jump(); } ... 20. class Animal {} ... 30. class Dog extends Animal { 31. Tail tail; 32. } ... 40. class Beagle extends Dog implements Jumper{ 41. public void jump() {} 42. } ... 50. class Cat implements Jumper{ 51. public void jump() {} 52. }. Which three are true?()
多项选择题 Click the Exhibit button. Given: Which two statements are true if a NullPointerException is thrown on line 3 of class C?()