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Oracle Java Certified Programmer Sample Questions:

1. Which two demonstrate an "is a" relationship? (Choose Two)

A) public interface Person { }
public class Employee extends Person { }
B) public interface Shape { }
public class Employee extends Shape { }
C) interface Component { }
Class Container implements Component (
Private Component[ ] children;
)
D) public class Species { }
public class Animal (private Species species;)
E) public interface Color { }
public class Employee extends Color { }

2. Exhibit:
1. class A {
2 . public int getNumber(int a) {
3 .return a + 1;
4 .}
5 .}
6 .
7 . class B extends A {
8 . public int getNumber (int a) {
9 . return a + 2
1 0. }
1 1.
1 2. public static void main (String args[]){
1 3. A a = new B();
1 4. System.out.printIn(a.getNumber(0));
1 5.}
1 6. }
What is the result?

A) Compilation succeeds and 2 is printed.
B) An error at line 8 causes compilation to fail.
C) An error at line 13 causes compilation to fail.
D) An error at line 14 causes compilation to fail.
E) Compilation succeeds and 1 is printed.

3. Which two can directly cause a thread to stop executing? (Choose Two)

A) Exiting from a synchronized block.
B) Calling the wait method on an object.
C) Calling the notify method on an object.
D) Calling the notifyAll method on an object.
E) Calling the setPriority method on a thread object.

4. Which statements about static inner classes are true? (Choose Two)

A) A static inner class has access to the non-static members of the outer class.
B) Static members of a static inner class can be referenced using the class name of the static innerclass.
C) A static inner class has no reference to an instance of the enclosing class.
D) A static inner class requires a static initializer.
E) A static inner class requires an instance of the enclosing class.

5. 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 collections are guaranteed to be synchronized.
D) The elements in the collection are guaranteed to be unique.
E) The elements in the collection are accessed using a unique key.

Solutions: