[OOP] Flashcards - Module 1

Question 1

[syntax] reading a character

Answer 1

scanner_name.next().charAt(0);

Question 2

8 data types in java

Answer 2

char, boolean, byte, int, short, long, float, double

Question 3

the only object that is defined, when a class is initially defined.

Answer 3

description

Question 4

refer to an object’s state.

Answer 4

Attribute

Question 5

include defining the class encapsulating data and methods.

Answer 5

Class Definitions

Question 6

This is also known as automatic type promotion.

Answer 6

Implicit Typecasting

Question 7

[syntax] typecasting char to int (for ASCII Value) and vice versa

Answer 7

int asciiValue = (int) ch ;
char ch = (char) asciiValue;

Question 8

[syntax] String content comparison

Answer 8

boolean <var_name> = str1.equals(str2); (result is either true or false)</var_name>

Question 9

Backslash and backspace escape sequence

Answer 9

\ and \b

Question 10

the principle where objects can share behaviors and adopt multiple forms.

Answer 10

Polymorphism

Question 11

Double/Single quote escape sequence

Answer 11

" and '

Question 12

characteristics distinguishing classes.

Answer 12

Attributes

Question 13

[syntax] string input using a scanner in java

Answer 13

String str = scanner_name.nextLine():

Question 14

errors that occur during the execution of the program.

Answer 14

Runtime Error

Question 15

In initializing characters, they should be enclosed in ____

Answer 15

single quotes

Question 16

A form of typecasting that requires the programmer to specify the desired data type.

Answer 16

explicit typecasting

Question 17

OOP Building Blocks

Answer 17

Classes, Objects, Methods, and Attributes

Question 18

the syntax or semantic errors detected at compile time.

Answer 18

Compile-time Errors

Question 19

Basic Structure of Java

Answer 19

Package Declarations, Import Statements, Class Definitions, main() method, Statements

Question 20

The data stored by the objects are kept in this field.

Answer 20

attributes

Question 21

Import Statements in Java

Answer 21

java.util., java.io., java.net., java.math.

Question 22

used by programmers for reusability or keeping the functionality encapsulated inside one object at a time.

Answer 22

Methods

Question 23

a principle where objects expose only the internal mechanisms necessary for other objects to function,

Answer 23

Abstraction

Question 24

principle that dictates that an object contains all its essential information, with only selected details made accessible.

Answer 24

Encapsulation

Question 25

includes external classes and libraries into the program.

Answer 25

Import Statements

Question 26

subroutines contained in an object

Answer 26

instance methods

Question 27

Scanner method that reads a word (string without spaces)

Answer 27

scanner_name.next();

Question 28

a concept that allows classes to inherit code and properties from other classes.

Answer 28

Inheritance

Question 29

Java is a programming language developed by ____ in the mid-____ known for its versatility, efficiency, and platform independence.

Answer 29

Sun Microsystems ; 1990s

Question 30

the instructions executed by the program within methods.

Answer 30

Statements

Question 31

occurs when the compiler automatically converts a value from one data type to another without explicit instructions from the programmer.

Answer 31

implicit typecasting

Question 32

contains the Collections framework, formatted printing, and scanning.

Answer 32

java.util.*

Question 33

Errors that lead to incorrect results

Answer 33

Logical Errors

Question 34

is the package for input and output functionalities.

Answer 34

java.io.*

Question 35

character sequences surrounded by double quotes.

Answer 35

strings

Question 36

the package including classes for performing arithmetic operations.

Answer 36

java.math.*

Question 37

Java operates on the "_____" principle,

Answer 37

write once, run anywhere

Question 38

[syntax] declaring a new scanner in java

Answer 38

Scanner = new Scanner(System.in);

Question 39

deals about creating objects that contain both data and functions.

Answer 39

Object-Oriented Programming

Question 40

the rules that define how words and punctuation are organized in a programming language.

Answer 40

Syntax

Question 41

These represent an abstract entity.

Answer 41

objects

Question 42

[syntax] String lexicographic comparison

Answer 42

int = str1.compareTo(str2); (result is 0 = equal, (-) = str1 < str2, and (+) = str1> str2

Question 43

describes the relationship between classes,

Answer 43

Association

Question 44

the instances of a class created with specifically defined data.

Answer 44

Objects

Question 45

special character combinations allowing you to represent the characters that are not printed using the normal way of printing.

Answer 45

Escape Sequences

Question 46

refer to those functions that the objects can perform, defined inside the class.

Answer 46

Methods

Question 47

[syntax] closing a scanner

Answer 47

scanner_name.close();

Question 48

A single- line comment in Java starts with ____ and multiline comments are enclosed between ____

Answer 48

// ; /* */

Question 49

The object behaviors are described in this

Answer 49

Methods

Question 50

Carriage return and form feed escape sequence

Answer 50

\r and \f

Question 51

contains networking capabilities.

Answer 51

java.net.*

Question 52

OOP Principles

Answer 52

Encapsulation, Abstraction, Inheritance, Polymorphism, Syntax, Coupling, Association

Question 53

[syntax] string copying

Answer 53

String str2 = str1.substring(0);

Question 54

it is where the program execution begins

Answer 54

main() method

Question 55

also known as format specifiers, are essential for displaying variable values in output statements in Java.

Answer 55

Placeholder

Question 56

refers to the degree of dependency between software components.

Answer 56

Coupling

Question 57

optional, and used for class organizations.

Answer 57

Package Declarations

Question 58

Errors in Java

Answer 58

Compile-time Errors, Runtime Errors, Logical Errors

Question 59

also known as type conversion is the process of converting a value from one data type to another, allowing you to modify the interpretation of a value.

Answer 59

Typecasting

Question 60

Syntax Rules in Java

Answer 60

Case Sensitive, Class names start with uppercase, method names start with lowercase, file name = class name

Question 61

Newline and Tab Escape sequence

Answer 61

\n and \t

Question 62

the user-defined data types acting as the blueprint for individual objects, attributes, and methods.

Answer 62

Classes