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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) Compilation succeeds and 43 is printed.
B) Compilation succeeds but an exception is thrown at line 9.
C) Compilation succeeds and 4 is printed.
D) An error on line 9 causes compilation to fail.
E) An error on line 14 causes compilation to fail.
2. Which two statements are true regarding the creation of a default constructor? (Choose Two)
A) The default constructor invokes the no-parameter constructor of the superclass.
B) The default constructor initializes the instance variables declared in the class.
C) The default constructor initializes method variables.
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.
3. CORRECT TEXT
Exhibit:
1 . public class X {
2 . public static void main (String[]args) {
3 . string s = new string ("Hello");
4 . modify(s);
5 . System.out.printIn(s);
6 .}
7 .
8 . public static void modify (String s){
9 . s += "world!";
1 0.}
1 1. }
What is the result?
E.The program runs and prints "Hello"
F.An error causes compilation to fail.
G.The program runs and prints "Hello world!"
H.The program runs but aborts with an exception.
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) An error at line 5 causes compile to fail.
B) An error at line 6 causes an exception at runtime.
C) It prints f2[0] = 0.0
D) It prints f2[0] = NaN
E) An error at line 6 causes compile to fail.
5. Given:
1 . package foo;
2 .
3 . public class Outer (
4 .public static class Inner (
5 .)
6 . )
Which statement is true?
A) An instance of the inner class cannot be constructed outside of package foo.
B) An instance of the Inner class can be constructed with "new Outer.Inner ()"
C) From within the package bar, an instance of the inner class can be constructed with
"new inner()"
D) An instance of the inner class can only be constructed from within the outer class.
Solutions:
| Question # 1 Answer: A | Question # 2 Answer: B,E | Question # 3 Answer: Only visible for members | Question # 4 Answer: C | Question # 5 Answer: B |

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