Java Tutorials

A Step-By-Step Guide to charAt in Java

Java charAt() returns a character from a string at a given position. The charAt() uses the string’s index, starting from zero, to find the character at the provided index. A string is a sequence of characters that can include letters,…

How to Use Java Math.random

The Math.random() Java method generates a pseudo random number between 0.0 and 1.0. The resulting random number can be multiplied to get a range outside of 0-1, and the result can be 0 but is always less than 1. When…

How to Initialize an Array in Java

Initializing an array in Java means assigning values to a new array. Java arrays can be initialized during or after declaration. Simply assign data in an array format to the new or empty array. In Java, arrays are used to…

How to Initialize ArrayList in Java

The Java Arrays.asList() method and ArrayList class are used to initialize arrays in Java. The normal List interface cannot be used to create arrays, so the ArrayList class is required to create an empty array. The Java Arrays.asList() method allows…

Java Static

How to Use the Java Static Keyword When you’re working with classes in Java, you usually need to create an instance of the class before you can access its members. However, you may encounter a situation where you want to…

Java Array Contains

When you’re working with arrays in Java, you may encounter a situation where you want to check whether an array contains a particular value. For instance, if you are building a program that tracks your bird-watching progress this season, you…

Sort ArrayList Java

How to Sort an ArrayList in Java When you’re working with an ArrayList in Java, you may encounter a situation where you want to sort an ArrayList in ascending or descending order. For instance, you may have a list of…

Java Inheritance

Object-oriented programming includes a number of features that help prevent repetitive code. One of these features is inheritance. This tutorial will discuss, using examples, the basics of inheritance in Java. We will explore how inheritance works, why it is important,…

Java Abstract Class

How to Use Java’s “Abstract” Classes and Methods Abstraction is one of the three core principles in object-oriented programming—alongside encapsulation and inheritance.  Abstraction is one way to reduce the complexity of your programs and make your code easier to read.…

Java Stack Class

How to Use the Java Stack Class In programming, a stack is a last-in, first-out data structure used to store data. Stacks are useful in a variety of cases. For example, if you want to test symmetry in a list…

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