Tag «Java basics»

Java basics

Modular Java File Operations

Let’s create a simple Java project that demonstrates file operations, including creating a file, writing to it, reading from it, and finally deleting the file. This project could represent a simple note-taking application where users can add notes to a file, read their notes back, and choose to delete the notes file when they are …

Managing Files in Java

Working with files is a fundamental aspect of many Java applications, from simple scripts to complex systems. Java provides several classes and methods for reading from and writing to files, allowing developers to handle file input/output (I/O) operations efficiently. This tutorial covers the basics of file I/O in Java, including examples of how to read …

LinkedList vs ArrayList Java Examples

When working with collections in Java, one common dilemma is choosing between LinkedList and ArrayList. Both implement the List interface but have distinct differences in their internal workings and performance implications for various operations. This tutorial aims to shed light on LinkedList vs. ArrayList to help you decide which to use based on your specific …

Java LinkedList Tutorial

LinkedList in Java is a part of the Java Collections Framework and implements the List interface. It provides a doubly-linked list data structure that allows for efficient insertion, removal, and traversal operations, especially when operating near the head or tail of the list. Here, we’ll explore LinkedList through various examples to demonstrate its usage and …

Array vs ArrayList in Java

Arrays and ArrayLists in Java are both used to store collections of elements. However, they have significant differences in terms of usage, flexibility, and functionality. Understanding these differences is crucial for Java developers to make informed decisions about which to use based on their specific needs. This tutorial aims to clarify what sets Arrays and …

Java ArrayList Examples

ArrayList in Java is a resizable array implementation of the List interface. It provides dynamic arrays that can grow as needed, offering more flexibility than static arrays. Below are various examples demonstrating the use of ArrayList, including common operations like adding, removing, and iterating over elements. Basic Operations Creating an ArrayList

import java.util.ArrayList;

public class ArrayListExample {
    public static void main(String[] args) {
        ArrayList<String> colors = new ArrayList<>();
        colors.add("Red");
        colors.add("Green");
        colors.add("Blue");

        System.out.println(colors); // Output: [Red, Green, Blue]
    }
}

import java.util.ArrayList;

public class ArrayListExample {

public static void main(String[] args) {

ArrayList<String> colors = new ArrayList<>();

colors.add("Red");

colors.add("Green");

colors.add("Blue");

System.out.println(colors); // Output: [Red, Green, Blue]

}

Accessing Elements

String firstColor = colors.get(0);
System.out.println("First color: " + firstColor); // Output: First color: Red

1 2	String firstColor = colors.get(0); System.out.println("First color: " + firstColor); // Output: First color: Red

…

Java Recursion Examples

Recursion in Java is a process where a method calls itself to solve a problem. It’s a powerful technique used in solving problems that can be broken down into simpler, similar subproblems. Below, we’ll explore recursion with various examples, providing insights into how it works and its applications. Basic Recursion Example: Factorial Calculation A classic …

Java Methods Explained

Methods (also known as functions in some programming languages) in Java are blocks of code designed to perform specific tasks. They are executed when they are called (invoked) from some part of the program. Methods improve code reusability, readability, and organization. Here’s an exploration of methods in Java, including examples on methods with parameters, method …

Java Arrays Tutorial

Arrays in Java are a fundamental data structure that allows you to store multiple values of the same type in a single variable. Arrays are indexed, meaning each element of an array is associated with a unique index that allows for direct access. Let’s delve into arrays with examples and detailed comments. Declaring Arrays You …

Java Math Library Tutorial

The Java Math library provides a wide range of mathematical functions and constants that are useful for performing mathematical operations. This library is part of the java.lang package, so it’s automatically available and does not require an import statement. Here, we’ll explore various methods within the Math library, accompanied by examples and explanations. Constants in …