SCJP考试题310-025(第二套)18-147

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310-025 
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Question No: 1 
Given: 
1. public class test ( 
2. public static void main (String args[]) { 
3. int i = 0xFFFFFFF1; 
4. int j = ~i; 
5. 
6. } 
7. ) 
What is the decimal value of j at line 5? 
A. 0 
B. 1 
C. 14 
D. –15 
E. An error at line 3 causes compilation to fail. 
F. An error at line 4 causes compilation to fail. 
Answer: D
Question No: 2 
Given: 
Integer i = new Integer (42); 
Long 1 = new Long (42); 
Double d = new Double (42.0); 
Which two expressions evaluate to True? (Choose Two) 
A. (i ==1) 
B. (i == d) 
C. (d == 1) 
D. (i.equals (d)) 
E. (d.equals (i)) 
F. (i.equals (42)) 
Answer: D, E 
Question No: 3 
Exhibit : 
1. public class test ( 
2. private static int j = 0; 
3. 
4. private static boolean methodB(int k) ( 
5. j += k; 
6. return true; 
6. ) 
7. 
8. public static void methodA(int i) { 
9. boolean b: 
10. b = i < 10 | methodB (4); 
11. b = i < 10 || methodB (8); 
12. ) 
13. 
14. public static void main (String args[] } ( 
15. methodA (0); 
16. system.out.printIn(j); 
17. ) 
18. ) 
What is the result? 
A. The program prints "0" 
B. The program prints "4" 
C. The program prints "8" 
D. The program prints "12" 
E. The code does not complete. 
Answer: B 
Question No: 4 
Given 
1. Public class test ( 
2. Public static void main (String args[]) ( 
3. System.out.printIn (6 ^ 3); 
4. ) 
5. ) 
What is the output? 
Answer: 5 
Question No: 5 
Given: 
1. public class Foo { 
2. public static void main (String [] args) { 
3. StringBuffer a = new StringBuffer ("A"); 
4. StringBuffer b = new StringBuffer ("B"); 
5. operate (a,b); 
6. system.out.printIn{a + "," +b}; 
7. ) 
8. static void operate (StringBuffer x, StringBuffer y) { 
9. x.append {y}; 
10. y = x; 
11. ) 
12. } 
What is the result? 
A. The code compiles and prints "A,B". 
B. The code compiles and prints "A,A". 
C. The code compiles and prints "B,B". 
D. The code compiles and prints "AB,B". 
E. The code compiles and prints "AB,AB". 
F. The code does not compile because "+" cannot be overloaded for StringBuffer. 
Answer: D