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Oracle Java Certified Programmer Sample Questions:
1. Exhibit:
1 . class A {
2 . public String toString (){
3 . return "4";
4 .}
5 .}
6 . class B extends A {
7 .8.public String toString (){
8 . return super.toString()+ "3";
9 .}
1 0. }
1 1. public class Test {
1 2. public static void main(String[]args){
1 3.System.out.printIn(new B());
1 4.}
15.}
What is the result?
A) An error on line 14 causes compilation to fail.
B) An error on line 9 causes compilation to fail.
C) Compilation succeeds and 4 is printed.
D) Compilation succeeds and 43 is printed.
E) Compilation succeeds but an exception is thrown at line 9.
2. 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) The radius of a MyCircle object can be set without affecting its diameter.
C) Lines 6 and 7 should be in a synchronized block to ensure encapsulation.
D) The Mycircle class is fully encapsulated.
3. Which two statements are true regarding the creation of a default constructor? (Choose Two)
A) The default constructor initializes method variables.
B) The default constructor initializes the instance variables declared in the class.
C) The default constructor invokes the no-parameter constructor of the superclass.
D) If a class lacks a no-parameter constructor,, but has other constructors, the compiler creates a default constructor.
E) The compiler creates a default constructor only when there are no other constructors for the class.
4. Given:
1 . public class ArrayTest {
2 . public static void main (String[]args){
3 . float f1[], f2[];
4 . f1 = new float [10];
5 . f2 = f1;
6 . System.out.printIn ("f2[0]=" + f2[0]);
7 .}
8 .}
What is the result?
A) It prints f2[0] = 0.0
B) It prints f2[0] = NaN
C) An error at line 6 causes compile to fail.
D) An error at line 5 causes compile to fail.
E) An error at line 6 causes an exception at runtime.
5. Given:
1 . public class Foo implements Runnable (
2 . public void run (Thread t) {
3 . system.out.printIn("Running.");
4 . }
5 . public static void main (String[] args){
6 . new thread (new Foo()).start();
7 . )
8 .)
What is the result?
A) An error at line 2 causes the compilation to fail.
B) "Running" is printed and the program exits.
C) The program exists without printing anything.
D) An error at line 1 causes compilation to fail.
E) An exception is thrown.
Solutions:
| Question # 1 Answer: D | Question # 2 Answer: A | Question # 3 Answer: B,E | Question # 4 Answer: A | Question # 5 Answer: A |






