SCJP/OCJP IZO-851 Java Dumps - One

Q1. Given:
1. public class Test {
2. public static void main(String args[]) {
3. class Foo {
4. public int i = 3;
5. }
6. Object o = (Object)new Foo();
7. Foo foo = (Foo)o;
8. System.out.println(“i = “ + foo.i);
9. }
10. }
What is the result?
A. i = 3
B. Compilation fails.
C. A ClassCastException is thrown at line 6.
D. A ClassCastException is thrown at line 7.
Answer: A
Q2. Which two cause a compiler error? (Choose two)
A. float[] = new float(3);
B. float f2[] = new float[];
C. float[] f1 = new float[3];
D. float f3[] = new float[3];
E. float f5[] = { 1.0f, 2.0f, 2.0f };
F. float f4[] = new float[] { 1.0f. 2.0f. 3.0f};
Answer: A, B
Q3. Given:
11. int i =1,j =10;
12. do {
13. if(i++> --j) {
14. continue;
15. }
16. } while (i <5);
17. System.out.println(“i = “ +i+ “and j = “+j);
What is the result?
A. i = 6 and j = 5
B. i = 5 and j = 5
C. i = 6 and j = 5
D. i = 5 and j = 6
E. i = 6 and j = 6
Answer: D
Q4. Given:
1. class Test {
2. private Demo d;
3. void start() {
4. d = new Demo();
5. this.takeDemo(d);
6. }
7.
8. void takeDemo(Demo demo) {
9. demo = null;
10. demo = new Demo();
11. }
12. }
When is the Demo object, created on line 3, eligible for garbage collection?
A. After line 5.
B. After line 9.
C. After the start() method completes.
D. When the takeDemo() method completes.
E. When the instance running this code is made eligible for garbage collection.
Answer: E
Q5. Given:
1. interface Animal {
2. void soundOff();
3. }
4.
5. class Elephant implements Animal {
6. public void soundOff() {
7. System.out.println(“Trumpet”);
8. }
9. }
10.
11. class Lion implements Animal {
12. public void soundOff() {
13. System.out.println(“Roar”);
14. }
15. }
16.
17. class Alpha1 {
18. static Animal get( String choice ) {
19. if ( choice.equalsIgnoreCase( “meat eater” )) {
20. return new Lion();
21. } else {
22. return new Elephant();
23. }
24. }
25. }
Which compiles?
A. new Animal().soundOff();
B. Elephant e = new Alpha1();
C. Lion 1 = Alpha.get(“meat eater”);
D. new Alpha1().get(“veggie”).soundOff();
Answer: D
Q6. Which statement is true?
A. Memory is reclaimed by calling Runtime.gc().
B. Objects are not collected if they are accessible from live threads.
C. Objects that have finalize() methods are never garbage collected.
D. Objects that have finalize() methods always have their finalize() methods called before
the program ends.
E. An OutOfMemory error is only thrown if a single block of memory cannot be found
that is large enough for a particular requirement.
Answer: B
Q7. Given:
1. class A {
2. A() { }
3. }
4.
5. class B extends A {
6. }
Which two statements are true? (Choose two)
A. Class B’s constructor is public.
B. Class B’s constructor has no arguments.
C. Class B’s constructor includes a call to this().
D. Class B’s constructor includes a call to super().
Answer: B, D
Q8. Given:
11. int i = 1,j = 10;
12. do {
13. if(i>j) {
14. break;
15. }
16. j--;
17. } while (++i <5);
18. System.out.printIn(“i =” +i+” and j = “+j);
What is the result?
A. i = 6 and j = 5
B. i = 5 and j = 5
C. i = 6 and j = 4
D. i = 5 and j = 6
E. i = 6 and j = 6
Answer: D
Q9. Which statement is true?
A. Assertions can be enabled or disabled on a class-by-class basis.
B. Conditional compilation is used to allow tested classes to run at full speed.
C. Assertions are appropriate for checking the validity of arguments in a method.
D. The programmer can choose to execute a return statement or to throw an exception if
an assertion fails.
Answer: A