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Java Classes in Depth – Complete Guide with Definitions, Syntax & Examples Java Classes in Depth – Complete Guide with Definitions, Syntax & Examples Explore various types of Java Classes with clear explanations, real-world examples, and easy-to-follow syntax. 📚 Related Java Class Topics 1. Concrete Class in Java – Definition 2. Anonymous Class in Java – Definition 3. Inner Class in Java – Definition & Syntax 4. Singleton Class in Java – Definition 5. Static Nested Class in Java – Definition 6. POJO Class in Java – Definition & Syntax 7. Final Class in Java – Definition & Syntax 8. Abstract Class in Java – Definition, Syntax & Example Learn Java Free – Complete 14-Chapter Course © 2025 Java Learning Hub | Designed by OP Verma

Singleton Class in Java – Definition, Syntax, and Example Singleton Class in Java – Definition, Syntax, and Example Definition: A Singleton Class in Java is a design pattern that ensures only one instance of the class exists in the JVM. It provides a global point of access to that instance. Key Points: Only one instance is created during the entire lifecycle. Private constructor to prevent external instantiation. Static method to provide access to the single instance. Syntax Example: public class Singleton { private static Singleton instance; private Singleton() { // private constructor } public static Singleton getInstance() { if (instance == null) { instance = new Singleton(); } return instance; } } public class Main { public static void main(String[] args) { Singleton obj1 = Singleton.getInstance(); Singleton obj2 = Singleton.getInstance(); System.out....

Chapter 3: Java Syntax and Basic Structure Chapter 3: Java Syntax and Basic Structure Understanding the syntax and basic structure of Java is the foundation of becoming a skilled Java developer. In this chapter, we will explore how a typical Java program is structured, what elements are required, and how to write your first working Java code. 🧱 Basic Structure of a Java Program Every Java program starts with a class. Inside this class, we define the main() method which is the entry point of the program. public class HelloWorld { public static void main(String[] args) { System.out.println("Hello, World!"); } } 📌 Key Components 1. Class Declaration A Java program must have at least one class declaration. Syntax: public class ClassName { // class body } 2. The main() Method This is the entry point of any standalone Java application: public static void main(String[] args) { // code to execute } 3. Stateme...

Chapter 3: Java Syntax and Basic Structure 3.1 Structure of a Java Program Every Java program follows a specific structure that ensures it runs correctly. It includes: Class definition main() method (entry point) Statements inside curly braces { } public class MyProgram { public static void main(String[] args) { System.out.println("Java is powerful!"); } } 3.2 Components of a Java Program Class Name Methods Statements & Expressions 3.3 Java Syntax Rules Java is case-sensitive : Main ≠ main File name must match the public class name The main method must be exactly: public static void main(String[] args) 3.4 Java Comments Comments make your code easy to understand: Single-line: // This is a single-line comment Multi-line: /* This is a multi-line comment */ Documentation comment: /** * This class prints Hello World. */ 3.5 Printing Output in Java We use System.out.println() or Syst...