SCJP/OCJP IZO-851 Java Dumps - Three

Q1. Given:
1. public class Test {
2. public int aMethod() {
3. static int i = 0;
4. i++;
5. return i;
6. }
7. public static void main (String args[]) {
8. Test test = new Test();
9. test.aMethod();
10. int j = test.aMethod();
11. System.out.println(j);
12. }
13. }
What is the result?
A. 0
B. 1
C. 2
D. Compilation fails.
Answer: D
Q2. Given:
1. class Super {
2. public float getNum() { return 3.0f; }
3. }
4.
5. public class Sub extends Super {
6.
7. }
Which method, placed at line6, causes compilation to fail?
A. public void getNum() { }
B. public void getNum(double d) { }
C. public float getNum() { return 4.0f; }
D. public double getNum(float d) { return 4.0d; }
Answer: A
Q3. Given:
11. boolean bool = true;
12. if(bool = false) {
13. System.out.println(“a”);
14. } else if (bool) {
15. System.out.println(“c”);
16. } else if (!bool) {
17. System.out.println(“c”);
18. } else {
19. System.out.println(“d”);
20. }
What is the result?
A. a
B. b
C. c
D. d
E. Compilation fails.
Answer: E
Q4. Which statement is true?
A. catch(X x) can catch subclasses of X.
B. The Error class us a RuntimeException.
C. Any statement that can throw an Error must be enclosed in a try block.
D. Any statement that can throw an Exception must be enclosed in a try block.
E. Any statement that can throw a RuntimeException must be enclosed in a try block.
Answer: A
Q5. Which statement is true about assertion in the Java programming language?
A. Assertion expressions should not contain side effects.
B. Assertion expression values can be any primitive type.
C. Assertion should be used for enforcing preconditions on public methods.
D. An AssertionError thrown as a result of a failed assertion should always be handled by
the enclosing method.
Answer: A
Q6. Given:
1. package foo;
2.
3. import java.util.Vector;
4.
5. private class MyVector extends Vector {
6. int i = 1;
7. public MyVector() {
8. i = 2,
9. }
10. }
11.
12. public class MyNewVector extends MyVector {
13. public MyNewVector() {
14. i = 4;
15. }
16. public static void main(String args[]) {
17. MyVector v = new MyNewVector();
18. }
19. }
What is the result?
A. Compilation succeeds.
B. Compilation fails because of an error at line 5.
C. Compilation fails because of an error at line 6.
D. Compilation fails because of an error at line 14.
E. Compilation fails because of an error at line 17.
Answer: B
Q7. Given:
1. class TestSuper {
2. TestSuper(int i) { }
3. }
4. class TestSub extends TestSuper{ }
5. class TestAll {
6. public static void main (String [] args) {
7. new TestSub();
8. }
9. }
Which is true?
A. Compilation fails.
B. The code runs without exception.
C. An exception is thrown at line 7.
D. An exception is thrown at line 2.
Answer: A
Q8. Given:
10. int i = 0;
11. for (; i <4; i += 2) {
12. System.out.print(i + “”);
13. }
14. System.out.println(i);
What is the result?
A. 0 2 4
B. 0 2 4 5
C. 0 1 2 3 4
D. Compilation fails.
E. An exception is thrown at runtime.
Answer: A
Q9. Given:
1. public class SwitchTest {
2. public static void main(String[] args) {
3. System.out.println(“value = “ + switchIt(4));
4. }
5. public static int switchIt(int x) {
6. int j = 1;
7. switch (x) {
8. case 1: j++;
9. case 2: j++;
10. case 3: j++;
11. case 4: j++;
12. case 5: j++;
13. default: j++;
14. }
15. return j + x;
16. }
17. }
What is the result?
A. value = 3
B. value = 4
C. value = 5
D. value = 6
E. value = 7
F. value = 8
Answer: F