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Total No Of Questions: 50.
1) Given:
1. import java.util.*;
2. public class Old {
3. public static Object get0(List list) {
4. return list.get(0);
5. }
6. }
Which three will compile successfully? (Choose three.)



2) 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?


3) A programmer has an algorithm that requires a java.util.List that provides
an efficient implementation of add(0, object), but does NOT need to support quick random access.
What supports these requirements?



4) Given three files:
package xcom;
public class A {
// insert code here
}
package xcom;
public class B extends A {public void doB() { System.out.println("B.doB"); } }
import xcom.B;
class TestXcom {
public static void main(String[] args) {
B b = new B(); b.doB(); b.go();
}
}
Which, inserted at // insert code here will allow all three files to compile? (Choose all that apply.)



5) Given:
1. class Dog { }
2. class Beagle extends Dog { }
3.
4. class Kennel {
5. public static void main(String [] arfs) {
6. Beagle b1 = new Beagle();
7. Dog dog1 = new Dog();
8. Dog dog2 = b1;
9. // insert code here
10. }
11. }
Which, inserted at line 9, will compile? (Choose all that apply.)



6) 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?


7) Given:
d is a valid, non-null Date object
df is a valid, non-null DateFormat object set to the current locale
What outputs the current locale's country name and the appropriate version of d's date?



8) Given:
11. public class Person {
12. private name;
13. public Person(String name) {
14. this.name = name;
15. }
16. public int hashCode() {
17. return 420;
18. }
19. }
Which statement is true?



9) Given:
10. public class ClassA {
11. public void count(int i) {
12. count(++i);
13. }
14. }
And:
20. ClassA a = new ClassA();
21. a.count(3);
Which exception or error should be thrown by the virtual machine?



10) Given:
11. class Converter {
12. public static void main(String[] args) {
13. Integer i = args[0];
14. int j = 12;
15. System.out.println("It is " + (j==i) + " that j==i.");
16. }
17. }
What is the result when the programmer attempts to compile the code and run it with the command java Converter 12?

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