Java Program Structure

Class Declaration

A class in Java is declared using the keyword 'class' followed by the class name.

Class names should start with an uppercase letter by convention.

• Syntax: public class ClassName { ... }
• Classes can contain fields, methods, and constructors.

The main Method

The main method is the starting point of a Java program.

It must have a specific signature so the JVM can recognize it.

• public: accessible by the JVM.
• static: can be called without creating an object.
• void: does not return any value.
• String[] args: accepts command-line arguments.

Java Program Execution Flow

When a Java program runs, the JVM looks for the main method to begin execution.

Statements inside the main method execute sequentially unless control flow statements alter the sequence.

• Program starts at main method.
• Statements inside main run in order.
• Other methods can be called from main or other methods.