Java Tutorial

An array is an object that holds a fixed number of values of a certain variable type. There are many uses for arrays; they allow programmers to not need to declare a new variable for each value stored. If ten numbers need to be stored (ages, weights, wages, etc.), a single array with ten components may instead be used.

Today, we are going to work with a program that accepts user input in the form of five numbers, and calculates their mean and standard deviation.

In today's tutorial, we are going to cover how to generate random numbers in Java. Random numbers are used for a wide number of applications. They can be used for random sampling, simulations, generation of keys, lotteries, and games. One of the most common uses for random numbers is in video gaming. The outcomes of many events are determined by a random number generator. One of the simplest applications of random numbers is simulating a dice roll. That is what we will simulate in this application today.

In this tutorial, we will cover how to use conditional statements. Conditional statements work by executing code if a certain statement is true. There is also the option of running a different set of code if the conditional is not true. Conditionals use the "if" statement, and "else" is optional.

Today, we are going to cover how to find a square root in Java using the Math.sqrt method.

The following is the most basic example of a Java program. You need the Java Development Kit installed in order to compile source code you write. If you don't have JDK installed on your computer, go here and click the link for your operating system for directions on how to install it. The following code contains many comments. Anything after two slashes // is ignored by the compiler. Programmers use comments to help themselves and each other keep track of what their code is meant to do.

The following is a basic Java GUI program allowing a user to input the lengths of a triangle's sides to find out if it is a right triangle or not. Open notepad or any text editor, and paste in the following code:

Introduction: This tutorial is the eighth in my Java Network Programming using KryoNet series, or third in creating a chat client and server system, in which we are going to be handling sending and receiving messages. Previous: In the previous tutorial we created a client handler for our server to keep track of the connected clients. The System: We are going to give the user a GUI to interact with the system - to send messages and see the currently connected members of the chat. When a client connects, add them to a list. Send incoming messa

Introduction: This tutorial is the ninth in my Java Network Programming using KryoNet series, or fourth in creating a chat client and server system, in which we are going to be handling disconnected clients. Previous: In the previous tutorial we created a way to receive and send messages through a new Packet2Message class to and from our server/client. The System: We are going to give the user a GUI to interact with the system - to send messages and see the currently connected members of the chat. When a client connects, add them to a list.

Introduction: This tutorial is the seventh in my Java Network Programming using KryoNet series, or second in creating a chat client and server system, in which we are going to be setting up a way to handle clients on our server. Previous: In the previous tutorial we altered snippets of code to convert them from our test server and clients to our beginning point of chat server and clients. The System: We are going to give the user a GUI to interact with the system - to send messages and see the currently connected members of the chat. When a