• techcircle@techcirclesolutions.org
  • 703.852.0800
Facebook-f Instagram Linkedin-in
Course Content
Introduction to Java
Introduction to Java and its history Setting up the Java environment (JDK, IDE) Writing and running a "Hello World" program Basic data types and variables
0/4
Introduction to Java and its history
04:44
Setting up the Java environment (JDK, IDE)
08:12
Writing and running a “Hello World” program
04:42
Basic data types and variables
12:31
Operators and Expressions
Java Operators Operators are used to perform operations on variables and values. In the example below, we use the + operator to add together two values: ExampleGet your own Java Server int x = 100 + 50;
0/4
Arithmetic, relational, and logical operators
00:00
Precedence and associativity of operators
16:26
Type conversion and casting
05:49
Conditional expressions (ternary operator)
04:28
Control Flow Statements
Control flow statements are statements in Java that control the order in which other statements are executed. They allow you to specify the sequence in which statements are executed based on certain conditions. There are three types of control flow statements in Java: if-else statements, switch statements, and loops.
0/6
If-else statements
07:39
Switch statements
09:29
While Loop
08:50
For Loop
07:53
Do While loop
05:02
Break and continue statements
12:26
Arrays
In Java, an array is an object that stores a fixed-size sequential collection of elements of the same type. Each element in an array is identified by an index, which is a non-negative integer value that represents its position in the array.
0/3
Declaring and initializing arrays
03:58
Accessing array elements
09:25
2D Arrays
08:33
Object-Oriented Programming Basics
Object-oriented programming (OOP) is a programming paradigm that focuses on creating software components called objects, which encapsulate data and behavior. In OOP, you define classes that serve as blueprints for creating objects, and you create objects by instantiating these classes.
0/4
Class in Java
07:20
Constructors
12:25
Instance variables and methods
05:01
Access modifiers (public, private, protected)
11:26
OOP Concepts
Object-oriented programming (OOP) is a programming paradigm that focuses on creating software components called objects, which encapsulate data and behavior. OOP is based on several fundamental concepts, including: Encapsulation: Encapsulation is the process of hiding the internal details of an object from the outside world, and exposing only the necessary information and functionality through a public interface. This helps to ensure that the object's internal state remains consistent and secure. Inheritance: Inheritance is a mechanism that allows a class to inherit properties and methods from another class. The class that is being inherited from is called the superclass or base class, and the class that is inheriting is called the subclass or derived class. This helps to avoid code duplication and promote code reuse. Polymorphism: Polymorphism is the ability of an object to take on multiple forms. In Java, this is achieved through method overloading and method overriding. Method overloading allows you to define multiple methods with the same name but different parameter lists, while method overriding allows a subclass to provide its own implementation of a method that is already defined in the superclass. Abstraction: Abstraction is the process of representing complex real-world entities using simpler and more abstract concepts. In OOP, this is achieved by defining abstract classes and interfaces that provide a common set of methods and properties that can be used by multiple subclasses. Composition: Composition is the process of creating complex objects by combining simpler objects. In OOP, this is achieved by creating objects that contain other objects as instance variables. These concepts are closely related and work together to create a powerful and flexible programming paradigm. By using OOP concepts effectively, you can create more maintainable, reusable, and extensible code that is easier to understand and modify.
0/5
Encapsulation
11:05
Polymorphism
05:14
Inheritance
10:33
Abstract Classes
08:54
Interface
06:15
Exception Handling
Exception handling is a mechanism in Java that allows you to handle errors and other exceptional situations in your code. When an exception is thrown, Java looks for an appropriate exception handler to handle the exception and prevent the program from crashing. In Java, exceptions are represented by objects that are subclasses of the Throwable class. There are two types of exceptions in Java: checked exceptions and unchecked exceptions. Checked exceptions are exceptions that must be declared in the method signature, and must be handled or propagated to the calling method. Unchecked exceptions, on the other hand, do not have to be declared or caught, and can propagate up the call stack until they are handled by an appropriate exception handler.
0/1
What are exceptions?
11:06
Java Programming
About Lesson

Access modifiers in Java are keywords that define the visibility and accessibility of classes, methods, and variables. There are three main access modifiers in Java:

  1. public: A public member is visible and accessible from any class in the program, regardless of package or inheritance relationships. For example, if you declare a public method in a class, any other class in the program can call that method.

  2. private: A private member is only visible and accessible within the same class where it is declared. This means that no other class in the program can access or modify a private member. For example, if you declare a private variable in a class, no other class can read or write that variable.

  3. protected: A protected member is visible and accessible within the same class and within any subclass of that class. This means that a protected member can be accessed by any class that inherits from the class where it is declared. However, it cannot be accessed by classes in different packages that do not inherit from the class.

Here’s an example that demonstrates the use of access modifiers:

public class Person {
public String name; // public variable
private int age; // private variable
protected String address; // protected variable

public Person(String name, int age, String address) {
this.name = name;
this.age = age;
this.address = address;
}

public void sayHello() { // public method
System.out.println("Hello, my name is " + name);
}

private void secretMethod() { // private method
System.out.println("This is a secret method");
}

protected void protectedMethod() { // protected method
System.out.println("This is a protected method");
}
}

In this example, the Person class has three instance variables (name, age, and address) and three methods (sayHello(), secretMethod(), and protectedMethod()). The name variable is public, which means that it can be accessed from any class. The age variable is private, which means that it can only be accessed from within the same class. The address variable is protected, which means that it can be accessed from within the same class and within any subclass of the Person class.

The sayHello() method is public, which means that it can be called from any class. The secretMethod() method is private, which means that it can only be called from within the same class. The protectedMethod() method is protected, which means that it can be called from within the same class and within any subclass of the Person class.

Access modifiers are an important part of Java’s encapsulation mechanism, and they allow you to control the visibility and accessibility of your class’s members. By using access modifiers effectively, you can create more secure and maintainable code that is easier to understand and modify.

Previous
Next
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut elit tellus, luctus nec ullamcorper mattis, pulvinar dapibus leo.
Facebook-f Instagram Linkedin-in

Quick Links

Contact

© Tech Circle School 2023