Object Oriented Programming Using JAVA

  1. Variables and Operators in Java A variable is used to store data, and operators perform operations on these variables. Example: Arithmetic Operators public class BasicOperators { public static void main (String[] args) { int a = 10 , b = 5 ; System.out.println( "Sum: " + (a + b)); System.out.println( "Difference: " + (a - b)); System.out.println( "Product: " + (a * b)); System.out.println( "Quotient: " + (a / b)); System.out.println( "Remainder: " + (a % b)); } } Explanation: + (Addition), - (Subtraction), * (Multiplication), / (Division), % (Modulo) are used to perform arithmetic calculations. 2. Control Flow Statements in Java Control flow statements decide the execution path of the program based on conditions. Example: If-Else Statement public class IfElseExample { public static void main (String[] args) { int num = 10 ; ...

Let me take you on a journey through time. Imagine you are in the early days of computing, where machines were big, and programmers were pioneers. The world of programming was starting to take shape, and over time, languages evolved to make things easier, faster, and more powerful. And one of the most popular and influential languages today is Java , but it didn't come out of nowhere. 1. The Beginning: FORTRAN (1950s) In the late 1950s, computing was a daunting task. The first major programming language to be developed was FORTRAN (short for Formula Translation ), invented by IBM in 1957. It was designed to make scientific and engineering calculations faster and more efficient. FORTRAN helped move programming from machine-level code to something more human-readable. It was like giving humans the ability to talk to computers more easily. Key Contribution : First high-level language, allowing scientists to do complex calculations without knowing machine code. 2. COBOL: The Business...

  Computer architecture refers to the design and structure of a computer system. There are several types of computer architectures, each designed for specific purposes. Here are the main ones explained in simple terms: 1. Von Neumann Architecture (Stored Program Architecture) Description : This is the most common architecture for general-purpose computers. It consists of a Central Processing Unit (CPU) , memory , and input/output devices . How it works : In Von Neumann architecture, both data and instructions (programs) are stored in the same memory. The CPU fetches instructions from memory, executes them, and then moves to the next instruction. This architecture is simple and easy to implement. Example : Most personal computers, laptops, and desktops use this architecture. 2. Harvard Architecture Description : Harvard architecture is similar to Von Neumann, but with a key difference: it has separate memory for data and instructions . This allows the CPU to fetch instructions a...

Socket communication in Java enables communication between two endpoints over a network. There are two main types of sockets: TCP sockets and UDP sockets. Let's explain both types with examples: TCP Socket Communication: 1. **Server Side**:    - The server creates a `ServerSocket` object to listen for incoming connections on a specific port.    - When a client connects, the server accepts the connection and creates a `Socket` object to communicate with the client.    - The server reads from and writes to the socket's input and output streams to communicate with the client. import java.io.*; import java.net.*; public class TCPServer {     public static void main(String[] args) throws IOException {         ServerSocket serverSocket = new ServerSocket(12345);         System.out.println("Server started. Waiting for client...");         Socket clientSocket = serverSocket.accept();   ...

 Thread interruptions and synchronization are important concepts in Java concurrency for managing and controlling the execution of threads in a multi-threaded environment. Thread Interruptions: 1. Interrupting Threads:    - Java provides a mechanism to interrupt a thread's execution using the `interrupt()` method.    - When a thread is interrupted, it receives an `InterruptedException` which can be caught and handled. 2. Handling Interruptions:    - Threads can check whether they have been interrupted using the `interrupted()` method or `isInterrupted()` method.    - They can respond to interruptions by gracefully stopping their execution or cleaning up resources. 3. Interrupting Thread Execution:    - Interrupted threads should clean up resources and terminate their execution in a controlled manner. Synchronization: 1. Thread Safety:    - Synchronization ensures that multiple threads can safely access shared resources wit...

Thread scheduling and priority in Java determine the order in which threads are executed by the CPU. Java provides a way to specify the priority of threads to influence their scheduling, although the exact behavior depends on the underlying operating system. Here's an overview of thread scheduling and priority in Java: Thread Scheduling: 1. Preemptive Scheduling:    - Operating systems use preemptive scheduling to switch between threads based on priority and time-slicing.    - Higher priority threads are given preference over lower priority threads.    - Threads with the same priority are scheduled in a round-robin fashion. 2. Time-Slicing:    - The CPU allocates a small time slice to each thread, and then switches to the next thread in the queue.    - Time-slicing ensures that each thread gets a fair share of CPU time. Thread Priority: 1. Thread Priority Levels:    - Java assigns each thread a priority level ranging from 1 to ...

 In Java, there are two primary ways to create threads: 1. Extending the `Thread` class: You can create a new class that extends the `Thread` class and override its `run()` method to define the code that the thread will execute. 2. Implementing the `Runnable` interface: You can create a class that implements the `Runnable` interface and provide the implementation for its `run()` method. Then, you can pass an instance of this class to a `Thread` object. Let's see examples for both approaches:  1. Extending the `Thread` class: class MyThread extends Thread {     public void run() {         // Code to be executed by the thread         for (int i = 0; i < 5; i++) {             System.out.println("Thread: " + i);             try {                 Thread.sleep(1000); // Pause execution for 1 second         ...