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Total No Of Questions: 100.
1) Given:
1. public class MyLogger {
2. private StringBuilder logger = new StringBuuilder();
3. public void log(String message, String user) {
4. logger.append(message);
5. logger.append(user);
6. }
7. }
The programmer must guarantee that a single MyLogger object works properly for a multi-threaded system.
How must this code be changed to be thread-safe?



2) Given:
11. String test = “Test A. Test B. Test C.”;
12. // insert code here
13. String[] result = test.split(regex);
Which regular expression inserted at line 12 will correctly split test into
“Test A,” “Test B,” and “Test C”?



3) 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?


4)

Given:
15. public class Yippee {
16. public static void main(String [] args) {
17. for(int x = 1; x < args.length; x++) {
18. System.out.print(args[x] + " ");
19. }
20. }
21. }
and two separate command line invocations:
java Yippee
java Yippee 1 2 3 4

What is the result?



5) Given:
public static synchronized void main(String[] args) throws
InterruptedException {
Thread t = new Thread();
t.start();
System.out.print("X");
t.wait(10000);
System.out.print("Y");
}
What is the result of this code?



6)

class Gem extends Mineral { }
class Miner {
static int x = 7;
static String s = null;
public static void getWeight(Mineral m) {
int y = 0 / x;
System.out.print(s + " ");
}
public static void main(String[] args) {
Mineral[] ma = {new Mineral(), new Gem()};
for(Object o : ma)
getWeight((Mineral) o);
}
}

And the command-line invocation:
java Miner.java

What is the result?



7) Given:
7. void waitForSignal() {
8. Object obj = new Object();
9. synchronized (Thread.currentThread()) {
10. obj.wait();
11. obj.notify();
12. }
13. }
Which statement is true?


8) Given:
1. public class Person {
2. private String name;
3. public Person(String name) { this.name = name; }
4. public boolean equals(Person p) {
5. return p.name.equals(this.name);
6. }
7. }
Which statement is true?


9) 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 message1");
logIt("log message2","log message3");
logIt("log message4","log message5","log message6");
Which declaration satisfies this requirement?



10) Given:
11. public class Test {
12. public enum Dogs {collie, harrier, shepherd};
13. public static void main(String [] args) {
14. Dogs myDog = Dogs.shepherd;
15. switch (myDog) {
16. case collie:
17. System.out.print("collie ");
18. case default:
19. System.out.print("retriever ");
20. case harrier:
21. System.out.print("harrier ");
22. }
23. }
24. }
What is the result?

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