java

This tutorial covers creating a calculator to convert between Celsius (centigrade), Kelvin, and Fahrenheit. The user is first given the choice of which temperature unit they would like to convert from, and then they are given the results of the conversion. When different units are in use, things can get confusing. It is useful to have a calculator on hand for this sort of thing. Luckily, we can make one in Java that is able to do just that.

Previously, we covered how to use arrays in Java. If you are unfamiliar with arrays, please read through the first tutorial on arrays here. Two dimensional arrays are used to hold numbers that correspond to one another. One dimensional arrays can be thought of as a collection of variables listed in an indefinite number of rows, but a single column. Two dimensional arrays allow for both indefinite rows and columns.

First, let's take a look at a simple "Hello, world!" program from last time.

Often times, computer programs are used as a study method by educators. In this program, many of the concepts we have gone over thus far are put together to make a working quiz that asks math questions, and returns results on how the user did. For this program, the user is asked how many math questions they would like. It generates random math questions with numbers 1 through 10, and randomly selects between addition, subtraction, multiplication. and division. If the user is right, it will tell them so.

There are cases in which a developer may want a program to repeat a certain function for a finite number of times. While loops allow the programmer to make a function repeat until certain conditions are met. There are two common intended uses for loops. The first is to keep repeating a set of code until the user satisfies the criteria to exit the loop.

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.