In mathematics, factorial of a number means taking the product of all positive integers less than or equal to the given number. Or the product of multiplying all numbers from one to the given number. For example, the factorial of 6 is 1x2x3x4x5x6=720. Factorial has many uses, specifically in combinatorics or counting problems, as this is a building block for coming up with more complex counting formula. However, this also have uses in other branch of mathematics, hence writing program that is math heavy may need to have a way of computing factorial. If you are working with the Java programming language, this post might help. This post will show example on how to compute factorial in Java. We will help write a factorial program in Java.

The Fibonacci sequence is a very popular sequence in Math. The first two numbers in the sequence is 0 and 1. And all the succeeding numbers in the series is derived by adding the previous two numbers before it. For example, the third number in the sequence is derived by adding the first two which is 0 and 1, that equals to 1. The fourth is derived by adding the second and third 1+1 = 2. The fifth number is derived by adding the third and fourth 1+2 =3. And so on. And it is interesting to know that this sequence, which by first impression doesn't make sense, has many application in multiple discipline. For example, some traders who study technical analysis in stocks and other securities has observed that certain patterns in price movements follow the Fibonacci sequence. In software development, particularly in Agile practitioner, they follow task estimation using Fibonacci numbers. There are many more application of this. But this post will try to explore how to generate the Fibonacci series in Java.

Java hashCode() method has a close relationship with the equals() method as they complement and are used together. On a high level, the equals method should inspect the relevant data of two instances to determine if they are logically the same object. What internal data the equals() method used should also be used to generate the hashCode() value of a specific object instance. Below are more detailed discussion with code examples about Java hashCode.

Although a very old and dated data structure, array is still a very popular data structure to work with a collection of objects. This is because manipulation of arrays is very simple to learn and use. The only issue is it lacks advance features than can be found in the Collections API. For this tutorial, we will show how to Add elements to an Array in Java.

Byte Array is a convenient data structure that has many use cases. One scenario is when serializing some object to a file, and so we need to convert object to byte array when we write to file, and convert back from byte array to objects when we read from file. Another scenario is when sending data from one machine to another. Complex data structure is converted to a byte array before sending over the network, and on the other end the byte array is converted back to the original data structure. One of the simplest type of Object that we can convert to and from byte array is a String. This post will show how to convert Java Byte Array To String that can be applied to the use cases mentioned earlier.

String is one of the most fundamental data structure. It is versatile and useful for many cases. This is why Strings are used in many cases instead of using more restrictive data structure. But sometimes we need to compare two or more Strings for specific programming needs. Below are som examples on how we can compare Strings in Java.

String is an all around data structure for saving information because it can handle arbitrary sequence of characters. Often times, it is also used to store numeric, date, or other type of information. Sometimes we need to convert a String object to another data structure. For example, if an HTML form submits a date information to the server, each data in the form are passed as String. In this case, we would need to convert the String to Date such that other computations can be performed. For example, determining the age based on birth date and current date. Below are some ways on how we could convert a String into Date for some specific condition or method.

String is just a staple of most programming languages. It represents a sequence of characters into one data structure. It is a very convenient way to store many types of things in memory or in the database. An array on the other hand is one of the most simple way to represent multiple values. It is simpler that Classes such as List or Set because it can also be found in older programming language such as C/C++ or Pascal. It is only natural that we sometimes want to convert a String into an array of Characters for easier manipulation later. Below are some ways on how we can Convert a String to Char Array in Java .

Object is the root class of all classes in Java. Every class that we use or declare in Java has Object as a super class when traced to the top. All objects, including primitive wrappers, implements the method of the Object class. Array on the other hand is a convenient data structure for holding multiple values with the same class or interface. This post will discuss some caveats about Java Array Of Objects.

Strings and Arrays are two of the most popular data type in Java and in other popular language. String are able to represent a series of characters that is viewed as a single entity. While arrays are used to hold multiple values in the most simple way. But how do we convert a String like "One,Two,Three" into an array splitting into 3 different words or string? Below are some examples on in Java on how to split String into Array.