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Oracle Java Certified Programmer Sample Questions:

1. Which three are valid declarations of a float? (Choose Three)

A) Float foo = 2.02f;
B) Float foo = 3.03d;
C) Float foo = 0x0123;
D) Float foo = 1.0;
E) Float foo = -1;
F) Float foo = 42e1;

2. Which constructs a DataOutputStream?

A) New dataOutputStream(new FileWriter("out.txt"));
B) New dataOutputStream("out.txt");
C) New dataOutputStream(new OutputStream("out.txt"));
D) New dataOutputStream(new file("out.txt"));
E) New dataOutputStream(new writer("out.txt"));
F) New dataOutputStream(new FileOutputStream("out.txt"));

3. Exhibit:
1 . int I=1, j=0
2 .
3 . switch(i){
4 . case 2:
5 . j+=6;
6 .
7 . case 4:
8 . j+=1;
9 .
1 0. default:
1 1. j +=2;
1 2.
1 3. case 0:
1 4. j +=4;
1 5. }
1 6.
What is the value of j at line 16?

A) 2
B) 1
C) 4
D) 0
E) 6

4. Given:
1 . public class foo {
2 . public static void main (String[]args) {
3 . String s;
4 . system.out.printIn ("s=" + s);
5 . }
6 .}
What is the result?

A) The code does not compile because string s cannot be referenced.
B) The code compiles and "s=null" is printed.
C) The code compiles, but a NullPointerException is thrown when toString is called.
D) The code does not compile because string s is not initialized.
E) The code compiles and "s=" is printed.

5. You need to store elements in a collection that guarantees that no duplicates are stored.
Which two interfaces provide that capability? (Choose Two)

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

Solutions: