Basic Syntax of Java ~ Explore BihariGraphic

1. Basic Syntax

Java programs consist of classes and methods. Here's the basic structure:

         // Java program structure         public class HelloWorld {             public static void main(String[] args) {                 System.out.println("Hello, World!");             }         }

2. Variables and Data Types

Java supports various data types, and variables must be declared before use:

         // Variable declaration and initialization         int age = 25;         double salary = 50000.50;         char grade = 'A';         String name = "John Doe";

3. Control Flow Statements

Control the flow of your program using if-else, switch, while, for, and other statements:

         // Example of if-else statement         if (condition) {             // code to be executed if the condition is true         } else {             // code to be executed if the condition is false         }          // Example of a for loop         for (int i = 0; i < 5; i++) {             // code to be repeated in the loop         }

4. Object-Oriented Concepts

Java is an object-oriented language. Understand classes, objects, inheritance, polymorphism, encapsulation, and abstraction:

         // Example of a class and object         class Car {             String brand;              void start() {                 System.out.println("Car started");             }         }          Car myCar = new Car();         myCar.brand = "Toyota";         myCar.start();

5. Exception Handling

Handle exceptions using try, catch, finally, and throw:

      // Example of exception handling     try {         // code that may throw an exception     } catch (Exception e) {         // handle the exception     } finally {         // code to be executed regardless of whether an exception is thrown or not     }

6. Advanced Topics

Explore advanced concepts like multithreading, generics, lambda expressions, and Java Streams:

         // Example of multithreading         class MyThread extends Thread {             public void run() {                 // code to be executed in the thread             }         }          MyThread myThread = new MyThread();         myThread.start();

7. Networking in Java

Java provides classes for networking operations. Example of a simple socket client:

         import java.net.Socket;         import java.io.IOException;          public class SimpleSocketClient {             public static void main(String[] args) {                 try {                     Socket socket = new Socket("example.com", 80);                     // Perform networking operations                     socket.close();                 } catch (IOException e) {                     e.printStackTrace();                 }             }         }

8. Database Connectivity in Java

Java Database Connectivity (JDBC) allows interaction with databases. Example of connecting to a MySQL database:

                      import java.sql.Connection;             import java.sql.DriverManager;             import java.sql.SQLException;                  public class DatabaseConnection {                 public static void main(String[] args) {                     try {                         Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydatabase", "username", "password");                         // Perform database operations                         connection.close();                     } catch (SQLException e) {                         e.printStackTrace();                     }                 }             }