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Oracle Java Certified Programmer Sample Questions:

1. CORRECT TEXT
Given:
5. String foo = "base";
6. foo.substring(0,3);
7. foo.concat("ket")
8. Type the value of foo at line 8.

2. Which two are equivalent? (Choose Two)

A) 16>4
B) 16/2
C) 16>>>2
D) 16*4
E) 16/2^2
F) 16>>2

3. Which two statements are true regarding the creation of a default constructor? (Choose Two)

A) The default constructor initializes the instance variables declared in the class.
B) If a class lacks a no-parameter constructor,, but has other constructors, the compiler creates a default constructor.
C) The default constructor invokes the no-parameter constructor of the superclass.
D) The compiler creates a default constructor only when there are no other constructors for the class.
E) The default constructor initializes method variables.

4. 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) Compilation succeeds and 4 is printed.
B) Compilation succeeds but an exception is thrown at line 9.
C) An error on line 14 causes compilation to fail.
D) An error on line 9 causes compilation to fail.
E) Compilation succeeds and 43 is printed.

5. Exhibit:
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 .}
1 0. }
1 1.
1 2. public class MyNewVector extends MyVector {
1 3. public MyNewVector (){
1 4. i = 4;
1 5. }
1 6. public static void main (String args []){
1 7. MyVector v = new MyNewVector();
1 8.}
1 9. }
The file MyNewVector.java is shown in the exhibit.
What is the result?

A) Compilation will fail at line 17.
B) Compilation will fail at line 5.
C) Compilation will fail at line 6.
D) Compilation will succeed.
E) Compilation will fail at line 14.

Solutions: