Reading text files is one of the most common file manipulation task in Java. Here are some examples of how to read text files in Java using long method and also shortcuts in recent Java version.

In most cases where precision is important, we work with numbers having decimal point rather than whole numbers. For example, computation of points in 3D space - float will be more ideal for this. But later on, we need to convert back the float value to an integer when we want to know which coordinate on the screen it represents. This is just one scenario for the need of converting a Java float to int. There could be many more use cases. In case you also need it in your program, below are some examples on how to convert a float to int.

It is convenient to use doubles on calculations because of the flexibility on precision. But once we are done with complex computation, we would wish to extract the integral part of the result. This post will show how to convert a Java double to int. Several examples will be given for extracting the result of double to int.

When we are dealing with small number of data, we can use a variable for each data we need to monitor. If we don't know how much data we need to process, or if the data is large, an array is very useful. A Java Integer Array is a an array object that holds multiple Integer values, if we need many int values in our computation. Below are some examples on how to use int array in Java.

Arrays are usually useful when working with arbitrarily large number of data having the same type. It is usually convenient if we can print the contents of an array. Below are some examples on how to print the contents of an Array in Java.

Prime Number is a concept in math, specifically in number theory. A Prime Number is a whole number greater than 1 that has no positive divisors except 1 and itself. For example, the number 7 is prime because it has no other divisor except 1 and 7. While 6 is not a prime number because 2 and 3 can divide it. If you need to write a program that needs to check if a number if prime or not, below are some examples for Prime Number Program in Java.

An array is a type of variable that can hold multiple values of similar data type. This is very useful for storing values when we don't know how many of them is needed, or when the number of values is very large. The first thing we need to know is how to initialize a Java Array. Below are some code samples on how to perform Java Array Initialization.

An Array in Java can hold arbitrary number of elements, depending on how the array object was created. To perform operations on array, it is fundamental to know it's length. For example, if we wish to iterate to all the values in the array, the length of the Java array will determine how many times we need to loop. This post will show how to get the Java Array's length and show examples on how to use the value.

Arrays are very easy to use to hold large amount of values or Object instances. But a common problem is checking if a given array contains a specific value. There are several ways of doing this, some are efficient and some are not. Below are some examples on how to test if a Java array contains a certain value.

An array is a common data structure in many languages. It is simple and easy to understand, hence it is commonly used in many situations. However, it is very common requirement to sort a an array or a collection of objects to ensure elements are in specific order (E.g. increasing order of value). If you need to learn how to perform this operation, below are some examples on how to Sort an Array in Java.