单项选择题

A programmer needs to create a logging method that can accept an arbitrary number of arguments. For example, it may be called in these ways: 
logIt(”log message 1 “); 
logIt(”log message2”,”log message3”); 
logIt(”log message4”, “log message5”, “log message6); 
Which declaration satisfies this requirement?()

A. public void logIt(String * msgs)
B. public void logIt(String [] msgs)
C. public void logIt(String... msgs)
D. public void logIt(String msg1, String msg2, String msg3)


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1.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().

2.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.

4.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++)

5.多项选择题Which two code fragments correctly create and initialize a static array of int elements?() 

A. static final int[] a = { 100,200 };
B. static final int[] a; static { a=new int[2]; a[0]=100; a[1]=200; }
C. static final int[] a = new int[2] { 100,200 };
D. static final int[] a; static void init() { a = new int[3]; a[0]=100; a[1]=200; }

6.多项选择题

35. String #name = “Jane Doe”; 
36. int$age=24; 
37. Double_height = 123.5; 
38. double~temp = 37.5; 
Which two are true?()

A. Line 35 will not compile.
B. Line 36 will not compile.
C. Line 37 will not compile.
D. Line 38 will not compile.

7.单项选择题

55. int []x= {1, 2,3,4, 5}; 
56. int y[] =x; 
57. System.out.println(y[2]); 
Which is true?() 

A. Line 57 will print the value 2.
B. Line 57 will print the value 3.
C. Compilation will fail because of an error in line 55.
D. Compilation will fail because of an error in line 56.