Podcast
Questions and Answers
What is the main concept of encapsulation?
What is the main concept of encapsulation?
- Data Hiding (correct)
- Data Abstraction
- Data Polymorphism
- Data Inheritance
What is the type of architecture that Java supports?
What is the type of architecture that Java supports?
- Three-tier architecture
- Multi-tier architecture (correct)
- Single-tier architecture
- Dual-tier architecture
To achieve encapsulation, how should variables be declared?
To achieve encapsulation, how should variables be declared?
- Private (correct)
- Public
- Static
- Protected
What does 'Neutral Robust' mean in the context provided?
What does 'Neutral Robust' mean in the context provided?
In object-oriented programming, what do 'Class and object' represent?
In object-oriented programming, what do 'Class and object' represent?
Which inheritance is known as having one parent class and multiple child classes?
Which inheritance is known as having one parent class and multiple child classes?
Does a constructor have a return type?
Does a constructor have a return type?
What is another term for Compile time polymorphism?
What is another term for Compile time polymorphism?
Which type of inheritance is not supported in Java?
Which type of inheritance is not supported in Java?
What is the name of the component in JDK used to find errors in a Java program?
What is the name of the component in JDK used to find errors in a Java program?
What is the better approach when the number of arguments to pass in a method is unknown?
What is the better approach when the number of arguments to pass in a method is unknown?
What is the smallest individual unit of a program known as in Java?
What is the smallest individual unit of a program known as in Java?
What is the term used when a child class overwrites a method of the parent class?
What is the term used when a child class overwrites a method of the parent class?
What is the purpose of 'Javac' in Java?
What is the purpose of 'Javac' in Java?
What is the term for a constructor with no arguments?
What is the term for a constructor with no arguments?
How are static variables different from non-static variables?
How are static variables different from non-static variables?
How is runtime polymorphism achieved in Java?
How is runtime polymorphism achieved in Java?
What is the term used to describe exiting from a specific case when it is inside another 'if' statement?
What is the term used to describe exiting from a specific case when it is inside another 'if' statement?
Which loop executes its statements at least once without checking the condition initially?
Which loop executes its statements at least once without checking the condition initially?
What is the term for converting one data type into another data type in programming?
What is the term for converting one data type into another data type in programming?
Which type of loop has a terminating semicolon at the end of its structure?
Which type of loop has a terminating semicolon at the end of its structure?
What are the jumping statements available in Java for altering the flow of control?
What are the jumping statements available in Java for altering the flow of control?
Which type of array stores data in a matrix form with both row and column sizes defined?
Which type of array stores data in a matrix form with both row and column sizes defined?
Flashcards are hidden until you start studying
Study Notes
Java Basics
- Java supports Neutral/Robust architecture
- Java is an Object-Oriented Programming (OOP) language
Java Compiler and JDK Components
- javac is the compiler of Java
- Javah is the component of JDK that produces header files
- Java is the component of JDK used to execute or run the application
- Jdb is the component of JDK used to find errors in the program
Java Program Structure
- A Java program should have the same name as the class name
- Java programs should be saved with a .java extension
- NetBeans and Eclipse are provided by Java as editors or platforms
Data Types
- Short requires 16 bits (2 bytes)
- Int requires 32 bits (4 bytes)
- Boolean data type can only have values of true or false
- Char requires 16 bits (2 bytes)
Tokens and Operators
- There are 5 types of tokens in Java: Variables, Operators, Keywords, Special Characters, and Literals
- Literals mean the actual value
- Assignment Operator is also known as the Shorthand Operator
- Conditional Operator is also known as the Ternary Operator
- Instanceof is the operator used to test whether an object is an instance of the specified type
- Relational operator is also known as the Comparison operator
Control Structures
- Switch case is used when we have multiple options
- Break in switch case is used to exit the switch block
- Class is a template from which objects are created
- Encapsulation is the wrapping of variables and methods in a single unit
- The main concept of encapsulation is Data Hiding
Inheritance
- The parent-child concept is known as Inheritance
- The main advantage of inheritance is Reusability
- Multiple Inheritance is not supported in Java
- Hierarchical inheritance has one parent class and multiple child classes
- Multilevel inheritance is a combination of more than one type of inheritance
Polymorphism
- Compile-time polymorphism is also known as Static binding
- Runtime polymorphism is also known as Dynamic Binding
- Method overloading is a type of compile-time polymorphism
Constructors
- A constructor has the same name as the class name
- A constructor does not have a return type
- A constructor with no arguments is known as the Default constructor
- A constructor with parameters is known as the Parameterized constructor
Static Variables
- Static variables can be accessed by both static and non-static methods
- Static variables are like global variables
- Non-static variables are like local variables
Variables and Methods
- Varargs uses ellipsis (…)
- Varargs is used when the number of arguments is unknown
Loops and Jumping Statements
- A do-while loop is known as an Exit controlled loop
- A for loop is known as an Entry controlled loop
- Break and Continue are the jumping statements in Java
- Break is used to immediately exit from a loop or program
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
