A Java program refers to a set of instructions written in the Java programming language that can be executed by a computer. It is composed of classes, methods, variables, and other components to perform specific tasks.
A class is like a blueprint or template that defines the structure and behavior of objects. It serves as the foundation for creating objects in Java programs.
A method is a block of code that performs a specific task within a class. It encapsulates related actions or behaviors that can be called upon when needed.
A variable is used to store data in memory during execution. It represents named locations where values can be assigned and retrieved within the program.