Java Programming Basics Quiz

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Questions and Answers

What is the return type of the method getDay() in the MyDate class?

void

int (correct)

boolean

long

In the Dog class, what is the default weight assigned to a Dog object when created using its constructor?

42 (correct)

Unknown

Which method in the MyDate class is responsible for validating the day input?

getDay()

setDay(int)

getMonth()

isDayValid(int) (correct)

What type of access modifier is used for the weight variable in the Dog class?

private Signup and view all the answers

What is the purpose of the constructor in the Dog class?

To set default values for properties Signup and view all the answers

What is a valid statement to assign a boolean value in Java?

boolean truth = false; Signup and view all the answers

Which of the following is a primitive data type in Java?

int Signup and view all the answers

Which character represents a newline in Java?

'\n' Signup and view all the answers

What does the char data type in Java represent?

A single Unicode character Signup and view all the answers

Which of the following is NOT a primitive type in Java?

Character Signup and view all the answers

What is the range of values that can be stored in a byte data type in Java?

-128 to 127 Signup and view all the answers

What will the following code output? 'System.out.println('a');'

a Signup and view all the answers

In Java, how are boolean values expressed?

True or False Signup and view all the answers

What happens to the instance variable 'i' after the execution of firstMethod() in ScopeExample?

It becomes 9. Signup and view all the answers

What is the effect of the variable 'j' in the secondMethod()?

It only holds the value 8. Signup and view all the answers

Which statement correctly describes the parameter 'i' in secondMethod()?

It has the same name as the instance variable i. Signup and view all the answers

During the execution of firstMethod(), what value is passed to secondMethod()?

7 Signup and view all the answers

What will be the final value of the instance variable 'i' after the completion of main in TestScoping?

15 Signup and view all the answers

What purpose does the addDays method serve in the MyDate class?

It adds a specified number of days to the current date. Signup and view all the answers

What does the toString method return for a MyDate object initialized with 22, 7, 1964?

22-7-1964 Signup and view all the answers

What will be the output when the main method is executed in the TestMyDate class?

29-7-1964 Signup and view all the answers

What must be implemented in the addDays method according to the comment in the code?

Code to manage month overflow when days exceed month length. Signup and view all the answers

Which of the following statements is true about the MyDate class and its methods?

The addDays method uses the current object's attributes to create a new object. Signup and view all the answers

What is the correct way to construct an object of the MyDate class?

MyDate my_birth = new MyDate(22, 7, 1964); Signup and view all the answers

What initial values are assigned to the day, month, and year attributes in MyDate after constructing my_birth?

day: 22, month: 7, year: 1964 Signup and view all the answers

What does the 'new' keyword signify when creating an object in Java?

It allocates memory for the object. Signup and view all the answers

In object construction, how do you explicitly initialize an object's attributes?

By passing parameters to the constructor. Signup and view all the answers

What are the default values of the attributes in MyDate if no values are provided?

day: 0, month: 0, year: 0 Signup and view all the answers

Which of the following statements is true regarding object initialization?

You can use various data types as parameters. Signup and view all the answers

What will happen if you do not use the 'new' keyword in an object creation statement?

The statement will fail to compile. Signup and view all the answers

If you wanted to change the year of the my_birth object after its creation, what is the appropriate way to do it?

my_birth.setYear(1990); Signup and view all the answers

What is the initial value of a boolean variable in Java?

false Signup and view all the answers

What will happen if variable 'y' is used before initialization in the doComputation method?

The compiler will throw an error. Signup and view all the answers

Which of the following data types will have a default value of '0' when declared?

float Signup and view all the answers

How is the variable 'z' calculated in the doComputation method?

It is the sum of 'x' and 'y'. Signup and view all the answers

What is the initial value of a float variable when declared in Java?

0.0F Signup and view all the answers

Which of the following types requires an explicit initialization before use in the doComputation method?

int Signup and view all the answers

Which operator is highest in precedence when evaluating expressions in Java?

++ Signup and view all the answers

Which of these character representations is valid in Java to initialize a char variable?

'\u0000' Signup and view all the answers

Study Notes

Java Programming Language - SL-275

Course content covers the Java programming language and its core concepts.
Copyright information for the product/materials, including the licenses, usage restrictions on reproduction.
Java™ is a trademark of Sun Microsystems, Inc. in the U.S. and other countries, other trademarks are also noted. UNIX is another trademark used in the materials.

Course Contents

Course overview includes course goals and objectives, topics covered, and those not covered.
Introductions and how to use icons.
Objectives related to the material and relevance.
Fundamentals of the Java™ Language and technology features, such as the Java™™ Virtual Machine, garbage collection, and the Java™™ runtime environment. (JRE, JVM)
Description of compile-time and runtime errors.

Object-Oriented Programming

Objectives related to software engineering and the concepts of analysis and design.
Explanation of abstraction, classes (as blueprints for objects), declaring attributes, and methods.
Explanation of accessing object members, information hiding, encapsulation, and declaring constructors.
Explains the source file layout, software packages (such as directory layout and packages), the package statement, and the import statement, as well as development aspects, including compiling with the -d option

Identifiers, Keywords, and Types

The characteristics of identifiers, used for defining variables, classes, and methods.
Java programming language keywords.
Primitive data types (boolean, char, byte, short, int, long, float, double).
Literal values for numeric and textual types (including single and double quotes).
Primitive variables, and reference variables.

Expressions and Flow Control

Variable initialization, including methods, the principle behind initialization before use, operator precedence, logical, bitwise, and shift operators.
The if statement, including the single and complex forms, and the switch statement.
Looping statements( for, while, do-while) and special loop flow controls (break, continue).
Discussion of legal values and casting in programming contexts.

Arrays

About arrays
Declaring arrays.
Creating arrays.
Initializing arrays.
Multidimensional arrays.
Array bounds, and array resizing

Class Design

Objectives related to class design
Methods using variable arguments
Overloading constructors
Subclasses and superclasses - inheritance and virtual method invoking.
The Object class (and its methods)

Advanced Class Features

Objectives related to advanced features of classes.
Static variables, methods, and initializers
Static imports
Final classes, methods, and variables
Enumerated types
Abstract classes and methods
Interfaces
How to use interfaces and the use case and example provided

Exceptions and Assertions

Objectives related to exception and assertion handling
Exceptions, including categories (checked exceptions, unchecked exceptions, and errors)
Defining and handling user-defined exceptions.
Assertions, including recommended uses (internal invariants, control flow invariants, postconditions and class invariants).
Controlling runtime evaluation of assertions.

Text-Based Applications

Objectives on text-based applications
Using command-line arguments.
Working with system properties.
Using the properties class
Console I/O
Implementing file Input/Output functionalities
Describing the basic hierarchy of collections
Using sets and lists
Writing a program to iterate over a collection
Using generic collections

Building Java GUIs

Objectives focusing on building Java GUIs
The AWT package and its components (containers, components, layout managers).
Using layout managers (FlowLayout, BorderLayout, GridLayout).
Adding components to containers (Frames, Panels)
Implementing complex layouts
Drawing in AWT, including various shapes.

GUI Event Handling

Objectives related to GUI event handling and its implementations
Defining events and event handling.
Writing code to handle GUI events.
Using adapter classes.
Determining user actions and events.
Identifying the appropriate listener interfaces.
Using the appropriate listener and handler methods
Understanding the use of inner and anonymous classes.
Multiple listeners

Threads

Thread concepts
Creating threads in a programming context.
Controlling thread execution
Handling thread interactions.
Deadlocks
Synchronization using the object lock flag
Additional thread creation methods

Advanced I/O Streams

I/O Fundamentals
Streams (character and byte)
Input stream and output stream methods
Node streams (File, Memory Array, pipes).
Stream chaining

Networking

Objectives of networking in Java coding.
Networking concepts
Network connections using ServerSocket and Socket classes.
TCP/IP protocol concepts.
Minimal TCP/IP server design and implementation
Minimal TCP/IP client design and implementation

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Description

Test your knowledge on Java programming concepts, including class constructors, access modifiers, and primitive data types. This quiz covers various fundamental aspects of Java that every programmer should understand and master. Challenge yourself and see how well you've grasped these essential topics.