Hardest Java Test: Trivia Quiz!
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- 1.Consider the following program: class Point2D { private int x, y; public Point2D(int x, int y) { this.x = x; } public String toString() { return "[" + x + ", " + y + "]"; } public static void main(String []args) { Point2D point = new Point2D(10, 20); System.out.println(point.toString()); } } Which one of the following options provides the output of this program when executed?
- A.
Point
- B.
Point
- C.
[0,0]
- D.
[10,0]
- E.
[10,20]
- 2.Explain Runtime Exceptions.
- A.
It is an exception that occurs that probably could have been avoided by the programmer. As opposed to checked exceptions, runtime exceptions are ignored at the time of compliation.
- B.
Those are Exceptions thrown by JDBC API
- C.
Only the Exceptions thrown by IO operations are considered RuntimeExceptions
- D.
RuntimeExceptions are exceptions thrown by the compiler when it encounters an invalid statement
- 3.Which of the following is a collection that contains no duplicate elements?
- A.
Deque
- B.
ArrayList
- C.
Set
- D.
Map
- 4.Given this three definitions: interface I1 {} interface I2 {} abstract class C {} which one of the following will compile without errors?
- A.
class CI12 extends C, I1, I2 {}
- B.
Class CI12 implements C extends I1, I2 {}
- C.
class CI12 implements C, I1, I2 {}
- D.
class CI12 extends C implements I1, I2 {}
- E.
Class CI12 extends C implements I1 implements I2 {}
- F.
Class CI12 implements C extends I1 extends I2 {}
- 5.Which of the following statements are true regarding Statement and its derived types?
- A.
Objects of type Statement can handle IN, OUT, and INOUT parameters
- B.
PreparedStatement is used for executing servlets.
- C.
You can get an instance of PreparedStatement by calling preparedStatement() method in the Connection interface.
- D.
Statements are used hold Strings for longer periods
- 6.What's the difference between TreeSet and HashSet
- A.
TreeSet is the Interface and HashSet implements it
- B.
Both are Set implementations, however TreeSet is a SortedSet, which means it is elements have a natural order, while HashMap has an unpredictable order
- C.
There is no TreeSet in the Java Platform, only HashSet
- 7.What do you mean by Object?
- A.
Object is a runtime entity and it’s state is stored in fields and behavior is shown via methods. Methods operate on an object's internal state and serve as the primary mechanism for object-to-object communication.
- B.
They are the processors in which a Java Application is executed
- C.
Objects are also known as packages in the Java language
- D.
Are all of the methods in the Collections Framework
- 8.Consider the following code snippet:try (FileReader inputFile = new FileReader(file)) { //#1 System.out.print( (char)ch ); }}Which one of the following statements can be replaced in the place of statement #1?
- A.
While( (ch = inputFile.read()) != null) {
- B.
While( (ch = inputFile.read()) != -1) {
- C.
While( (ch = inputFile.read()) != 0) {
- D.
While( (ch = inputFile.read()) != EOF) {
- 9.Consider the following program:import java.util.ArrayList;class RemoveTest { public static void main(String []args){ ArrayList list = new ArrayList (); list.add(new Integer(2)); list.add(1); list.add(5); list.remove(2); // REMOVE System.out.println(list); }}Which one of the following options correctly describes the behavior of this program?
- A.
When executed, this program prints the following: [2, , 5]
- B.
When executed, this program prints the following: [2, 1].
- C.
When executed, this program prints the following: [1, 5].
- D.
This program results in a compiler error in the line marked with the comment REMOVE.
- E.
This program results in a NoSuchElementException in the line marked with the comment REMOVE.
- 10.What's the porpouse of the DAO Pattern
- A.
Commit all alterations in the Database
- B.
Separate the business logic from the data access logic in the application
- C.
Make the programmer work less
- D.
Establish a connection to the database
- 11.When we declare a field as volatile, what do we intend to do?class ClassVotile{ volatile boolean field;}
- A.
Make the field compile faster
- B.
Establish a happens before relationship regarding the reads and writes to the field
- C.
Avoid exceptions related to this field
- D.
The field is static and final, which means it cannot be changed
- 12.Is the following statement true: A Servlet cannot respond to requests, it is meant to connect to the database and serves as a pool of connections
- A.
True
- B.
False
- 13.Which of the following option describes a Map in Java?
- A.
An object that maps keys to values. A map cannot contain duplicate keys; each key can map to at most one value.
- B.
The root interface in the Collections Framework, the programmer never uses it
- C.
A container to map objects to values allowing duplicated keys
- D.
A subclass of Set that maps values to memory adresses
- E.
An subclass of Collection Interface that maps keys to values
- 14.What is the difference between static and non-static variables?
- A.
A static variable is also known as a constant, that cannot have values other than null
- B.
A Static variable is also known as a local variable, while a variable is global
- C.
A static variable is associated with the class as a whole rather than with specific instances of a class. Non-static variables take on unique values with each object instance.
- D.
A Static variable is also known as a variable of only one type, while a variable might be dynamically resolved to any type during the program's execution
- 15.
Consider the diagram, is the following statement true: The Controller cannot be implemented by the developer, and it must not be!- A.
True
- B.
False
- 16.Which of these packages contain classes and interfaces used for input & output operations of a program?
- A.
Java.util
- B.
Java.lang
- C.
Java.io
- D.
All mentioned
- 17.Is the following Statement true: InputStreams and OutputStreams are part of the java built-in mechanism for I/O operations
- A.
True
- B.
False
- 18.ORM stands for________________
- A.
Object Runtime Mapping
- B.
Object Relational Mapping
- C.
Oriented Runtime Matching
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