Java Polymorphism, Overloading, Lambdas & Exceptions

Posted by admin on Feb 1, 2026 in Computer Engineering in Information Technologies Engineering | 0 comments

Constructor and Method Overloading

class Calculator {
    // Constructor overloading: same name, different parameters
    Calculator() { System.out.println("Default Calculator created"); }
    Calculator(String mode) { System.out.println(mode + " Calculator created"); }
    // Method overloading: same name, different parameters
    int add(int a, int b) { return a + b; }
    double add(double a, double b) { return a + b; }
}

public class OverloadingDemo {
    public static void main(String[] args)

Java OOP Code Samples: Shapes, Resizable, Inner Classes

Posted by admin on Jan 30, 2026 in Computer Engineering in Information Technologies Engineering | 0 comments

Java OOP Code Samples: Shapes, Resizable, Inner Classes

Summary: This page presents several Java object-oriented examples in one place. Examples include abstract classes for shapes, a resizable Rectangle via an interface, nested inner classes, a custom exception, and a small package usage example. The original code is preserved as a preformatted block below.

Complete Java Examples (original content preserved)

abstract class Shape {
abstract double calculateArea();
abstract double calculatePerimeter(

Core Java Programming Examples Collection

Posted by admin on Jan 10, 2026 in Computer Engineering in Information Technologies Engineering | 0 comments

public class ReverseNumber {
    public static void main(String[] args) {
        int number = 1234;
        int reverse = 0;
        int original = number;
        while (number != 0) {
            int digit = number % 10;
            reverse = reverse * 10 + 

Essential Java Algorithms and Programming Fundamentals

Posted by admin on Dec 5, 2025 in Computer Engineering in Information Technologies Engineering | 0 comments

Bubble Sort Algorithm in Java

Bubble Sort is a fundamental sorting algorithm that repeatedly steps through the list, compares adjacent elements, and swaps them if they are in the wrong order. It is known for its simplicity, though it is inefficient for large lists.

import java.util.Scanner;

class program {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter number of elements: ");
        int n = sc.nextInt();
        int arr[

Essential Java Concepts: OOP, JVM, and Exception Handling

Posted by admin on Nov 22, 2025 in Computer Engineering in Information Technologies Engineering | 0 comments

Java Program: Convert String to Uppercase

This simple Java program demonstrates how to use the built-in toUpperCase() method of the String class.

public class UpperCase
{
    public static void main(String[] args)
    {
        String str = "hello world";
        System.out.println(str.toUpperCase());
    }
}

Understanding JVM and JDK

JVM (Java Virtual Machine)

The JVM is the runtime engine that executes the Java bytecode. It is an abstract machine that enables Java to be platform-independent, adhering

Java Fundamentals: Bytecode, OOP Concepts, and Programming Examples

Posted by admin on Nov 9, 2025 in Computer Engineering in Information Technologies Engineering | 0 comments

Java Bytecode and Platform Independence

Defining Java Bytecode

Java Bytecode is the intermediate code generated by the Java compiler after compiling a Java program. When you write a Java source file (.java) and compile it using javac, the compiler converts it into a bytecode file (.class). This bytecode is not specific to any machine and can be executed by the Java Virtual Machine (JVM) on any platform.

Justification for Platform Independence

Platform independence means that a Java program can run on