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Oracle Java Certified Programmer Sample Questions:

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

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

2. Which two statements are true? (Choose Two)

A) Event if a class Super does not implement any interfaces, it is still possible to define an anonymous inner class that is an immediate subclass of Super that implements multiple interfaces.
B) An anonymous inner class constructor can take arguments in some situation.
C) Even if a class Super does not implement any interfaces, it is still possible to define an anonymous inner class that is an immediate subclass of Super that implements a single interface.
D) An anonymous inner class that is a direct subclass that is a direct subclass of Object can implementmultiple interfaces.
E) An anonymous inner class can be declared inside of a method

3. Given:
1 . public class X {
2 . public static void main (String[] args){
3 . byte b = 127;
4 . byte c = 126;
5 . byte d = b + c;
6 .}
7 . }
Which statement is true?

A) Line 5 contains an error that prevents compilation.
B) Compilation succeeds and d takes the value 253.
C) Line 5 throws an exception indicating "Out of range"
D) Line 3 and 4 contain error that prevent compilation.
E) The compilation succeeds and d takes the value of 1.

4. Which constructs a DataOutputStream?

A) New dataInputStream("in.txt");
B) New dataInputStream(new FileInputStream("in.txt"));
C) New dataInputStream(new file("in.txt"));
D) New dataInputStream(new FileWriter("in.txt"));
E) New dataInputStream(new InputStream("in.txt"));
F) New dataInputStream(new writer("in.txt"));

5. The file "file.txt" exists on the file system and contsins ASCII text.
Given:
3 8. try {
3 9. File f = new File("file.txt");
4 0. OutputStream out = new FileOutputStream(f, true);
4 1. }
4 2. catch (IOException){}
What is the result?

A) The code runs and deletes the file from the file system.
B) An exception is thrown because the file is not closed.
C) The code runs and sets the length of the file to 0.
D) The code runs and no change is made to the file.
E) The code does not compile.

Solutions: