多项选择题
10. class Foo {
11. static void alpha() { /* more code here */ }
12. void beta() { /* more code here */ }
13. }
Which two are true?()
A. Foo.beta() is a valid invocation of beta().
B. Foo.alpha() is a valid invocation of alpha().
C. Method beta() can directly call method alpha().
D. Method alpha() can directly call method beta().
相关考题
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单项选择题
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? ()
A. 1 2 3
B. Compilation fails because of an error in line 12.
C. Compilation fails because of an error in line 13.
D. Compilation fails because of an error in line 14.
E. A ClassCastException is thrown at runtime. -
单项选择题
11. public enum Title { 12. MR(”Mr.”), MRS(”Mrs.”), MS(”Ms.”); 13. private final String title; 14. private Title(String t) { title = t; } 15. public String format(String last, String first) { 16. return title + “ “ + first + “ “ + last; 17. } 18. } 19. public static void main(String[] args) { 20. System.out.println(Title.MR.format(”Doe”, “John”)); 21. } What is the result?()
A. Mr. John Doe
B. An exception is thrown at runtime.
C. Compilation fails because of an error in line 12.
D. Compilation fails because of an error in line 15.
E. Compilation fails because of an error in line 20. -
单项选择题
public class Ball { public enum Color { RED, GREEN, BLUE }; public void foo() { // insert code here { System.out.println(c); } } } Which code inserted at line 14 causes the foo method to print RED, GREEN, and BLUE?()
A. for( Color c : Color.values())
B. for( Color c = RED; c <= BLUE; c++)
C. for( Color c; c.hasNext() ; c.next())
D. for( Color c = Color[0]; c <= Color[2]; c++)
E. for( Color c = Color.RED; c <= Color.BLUE; c++)
