Braindumps for "1Z0-501" Exam

Oracle Java Certified Programmer

 Question 1.
Which method is an appropriate way to determine the cosine of 42 degrees?

A. Double d = Math.cos(42);
B. Double d = Math.cosine(42);
C. Double d = Math.cos(Math.toRadians(42));
D. Double d = Math.cos(Math.toDegrees(42));
E. Double d = Math.cosine(Math.toRadians(42));

Answer:    C

Question 2.
You need to store elements in a collection that guarantees that no duplicates are stored and all elements can be accessed in natural order. Which interface provides that capability?

A. Java.util.Map.
B. Java.util.Set.
C. Java.util.List.
D. Java.util.StoredSet.
E. Java.util.StoredMap.
F. Java.util.Collection.

Answer:    D

Question 3.
Which statement is true for the class java.util.HashSet?

A. The elements in the collection are ordered.
B. The collection is guaranteed to be immutable.
C. The elements in the collection are guaranteed to be unique.
D. The elements in the collection are accessed using a unique key.
E. The elements in the collections are guaranteed to be synchronized.

Answer:    C

Question 4.
Given:

1. public class IfTest (
2. public static void main(string[]args) {
3. int x = 3;
4. int y = 1;
5. if (x = y)
6. system.out.printIn(“Not equal”);
7. else
8. system.out.printIn(“Equal”);
9. }
10. )

What is the result?

A. The output is “Equal”
B. The output in “Not Equal”
C. An error at line 5 causes compilation to fall.
D. The program executes but does not print a message.

Answer:    C

Question 5.
Exhibit:

1. public class test (
2. public static void main(string args[]) {
3. int 1= 0;
4. while (i) {
5. if (i==4) {
6. break;.
7. )
8. ++i;
9. )
10.
11. )
12. )

What is the value of i at line 10?

A. 0
B. 3
C. 4
D. 5
E. The code will not compile.

Answer:    E

Question 6.
Exhibit:

1. class A implements runable (
2. int i;
3. public void run () (
4. try (
5. thread.sleep(5000);
6. i= 10;
7. ) catch(InterruptedException e) {}
8. )
9. )
10.
11. public class Test {
12. public static void main (string args[]) (
13. try (
14. A a = new A ();
15. Thread t = new Thread (a);
16. t.start();.
17.
18. int j= a.i;
19.
20. ) catch (Exception e) {}
21. )
22. )

Which statement al line 17 will ensure that j=10 at line 19?

A. a.wait();
B. t.wait();
C. t.join();
D. t.yield();
E. t.notify();
F. a.notify();
G. t.interrupt();

Answer:    C

Question 7.
Exhibit:

1. public class X implements Runnable (
2. private int x;
3. private int y;
4.
5. public static void main(String [] args) (
6. X that = new X();
7. (new Thread(that)) . start( );
8. (new Thread(that)) . start( );
9. )
10.
11. public synchronized void run( ) (
12. for (;;) (
13. x++;
14. y++;
15. System.out.printIn(“x = “ + x + “, y = “ + y);
16. )
17. )
18. )

What is the result?

A.	An error at line 11 causes compilation to fail.
B.	Errors at lines 7 and 8 cause compilation to fail.
C.	The program prints pairs of values for x and y that might not always be the same on the same line (for example, “x=2, y=1”)
D.	The program prints pairs of values for x and y that are always the same on the same line (for example, “x=1, y=1”. In addition, each value appears twice (for example, “x=1, y=1” followed by “x=1, y=1”)
E.	The program prints pairs of values for x and y that are always the same on the same line (for example, “x=1, y=1”. In addition, each value appears twice (for example, “x=1, y=1” followed by “x=2s, y=2”)

Answer:    E

Question 8.
Which will declare a method that forces a subclass to implement it?

A. Public double methoda();
B. Static void methoda (double d1) {}
C. Public native double methoda();
D. Abstract public void methoda();
E. Protected void methoda (double d1){}

Answer:    D

Question 9.
You want subclasses in any package to have access to members of a superclass. Which is the most restrictive access modifier that will accomplish this objective?

A. Public
B. Private
C. Protected
D. Transient
E. No access modifier is qualified

Answer:    C

Question 10.
Given:

1. abstract class abstrctIt {
2. abstract float getFloat ();
3. )
4. public class AbstractTest extends AbstractIt {
5. private float f1= 1.0f;
6. private float getFloat () {return f1;}
7. }

What is the result?

A. Compilation is successful.
B. An error on line 6 causes a runtime failure.
C. An error at line 6 causes compilation to fail.
D. An error at line 2 causes compilation to fail.

Answer:    C

Question 11.
Exhibit:

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.printIn(j);
12.]
13.}

What is the result?

A. Compilation will fail.
B. Compilation will succeed and the program will print “0”
C. Compilation will succeed and the program will print “1”
D. Compilation will succeed and the program will print “2”

Answer:    D

Question 12.
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 line 6, will cause a compiler error?

A. Public float getNum() {return 4.0f; }
B. Public void getNum () { }
C. Public void getNum (double d) { }.
D. Public double getNum (float d) {retrun 4.0f; }

Answer:    B

Question 13.
Given:

1. public class X (
2. public object m () {
3. object o = new float (3.14F);
4. object [] oa = new object [1];
5. oa[0]= o;
6. o = null;
7. return oa[0];
8. }
9. }

When is the float object created in line 3, eligible for garbage collection?

A. Just after line 5
B. Just after line 6
C. Just after line 7 (that is, as the method returns)
D. Never in this method.

Answer:    D

Question 14.
Given:
3. string foo = “ABCDE”;
4. foo.substring(3);
5. foo.concat(“XYZ”);
6.

Type the value of foo at line 6.

Answer:    ABCDE

Question 15.
Which two CANNOT directly cause a thread to stop executing? (Choose Two)

A. Existing from a synchronized block.
B. Calling the wait method on an object.
C. Calling notify method on an object.
D. Calling read method on an InputStream object.
E. Calling the SetPriority method on a Thread object.

Answer:    A, C

Question 16.
Exhibit
1. public class SyncTest{
2. public static void main(String[] args) {
3. final StringBuffer s1= new StringBuffer();
4. final StringBuffer s2= new StringBuffer();
5. new Thread () {
6. public void run() {
7. synchronized(s1) {
8. s2.append(“A”);
9. synchronized(s2) {
10. s2.append(“B”);
11. System.out.print(s1);
12. System.out.print(s2);
13. }.
14. }
15. }
16. }.start();
17. new Thread() {
18. public void run() {
19. synchronized(s2) {
20. s2.append(“C”);
21. synchronized(s1) {
22. s1.append(“D”);
23. System.out.print(s2);
24. System.out.print(s1);
25. }
26. }
27. }
28. }.start();
29. }
30. }
Which two statements are true? (Choose Two)

A. The program prints “ABBCAD”
B. The program prints “CDDACB”
C. The program prints “ADCBADBC”
D. The output is a non-deterministic point because of a possible deadlock condition.
E. The output is dependent on the threading model of the system the program is running on.

Answer:    D, B

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