#22 Java Class and Object Practical: Adding with Variables and Understanding Data Types

📚 In this video, we learn about classes and objects in Java.

💻 We create a class called 'calculator' and define methods and variables within it.

🔢 To add two numbers using the class, we declare variables, assign values to them, and use the addition operator.

💡 In object-oriented programming, objects are created by designing a class and then instantiating it.

📱 The manufacturing of an object is done by the JVM, so the focus should be on designing it.

🧮 Objects have properties and methods, which can be defined in a class. Methods perform actions, such as addition.

📝 In Java, methods are defined in classes using the 'method' keyword and can have parameters.

🔄 To call a method in Java, you need to create an instance of the class where the method is defined.

❌ Directly calling a method without an instance of the class will result in an error.

💡 To access a method from a different class in Java, you need both the design (class) and the object instance.

📱 In programming, we need both the design (class) and the object instance to perform specific actions or operations.

🔑 To create an object instance in Java, you specify the type (class) and create a reference variable to access its methods.

📚 Creating an object in Java involves using the 'new' keyword followed by the class name.

🔢 Initializing variables and accepting return values can be done using methods and constructors.

✅ By following these steps, you can successfully create and call methods on objects in Java.

📌 Using a specific value to be returned in a Java method by creating a variable and returning its value.

🔢 Understanding the importance of passing values when calling a method in Java.

💡 Differentiating between variable names to accurately assign values when calling a method in Java.

📚 Creating a class and object in Java allows you to organize variables and methods.

🔧 By using variables in the class instead of hardcoded values, you can easily pass different values to the object.

💡 To use the class, you need to create an object by specifying the class name, and then you can call methods on that object.