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Oracle 1Z0-501 Exam Syllabus Topics:

Oracle Java Certified Programmer Sample Questions:

1. Which statement is true for the class java.util.ArrayList?

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.

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

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

3. Which two interfaces provide the capability to store objects using a key-value pair?
(Choose Two)

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

4. Exhibit:
1 . public class Mycircle {
2 . public double radius;
3 . public double diameter;
4 .
5 . public void setRadius(double radius)
6 . this.radius = radius;
7 . this.diameter= radius * 2;
8 .}
9 .
1 0. public double getRadius(){
1 1. return radius;
1 2.}
1 3. }
Which statement is true?

A) The diameter of a given MyCircle is guaranteed to be twice its radius.
B) Lines 6 and 7 should be in a synchronized block to ensure encapsulation.
C) The radius of a MyCircle object can be set without affecting its diameter.
D) The Mycircle class is fully encapsulated.

5. Which interface does java.util.Hashable implement?

A) Java.util.Hashable.
B) Java.util.Collection.
C) Java.util.List.
D) Java.util.Map.

Solutions: