Java File IO

The FileWriter class of java.io package makes writing to files in Java as easy as A-B-C. The FileWriter class writes to files as a stream of characters instead of bytes(as in FileOutputStream). Like its input-oriented counterpart FileReader, the FileWriter class is intended for writing “text” based files one character at a time. Let us look […]

The FileReader class of java.io package provides a seamless and easy-to-use way to read and analyse the contents of a file using Java. The FileReader class, works similar to the FileInputStream class because it reads the file data as a stream. However, unlike the latter which reads files as a stream of bytes, FileReader reads […]

There are many ways to create a file in java. Creating a file is a very easy task. We will learn 5 different ways to Create a file. Using java.io.File class’s createNewFile method This is simplest and oldest way to create file.Here is simple snapshot to create a file in java. [crayon-676805d68df80282368233/] Using java.nio.file.Files from […]

Java Apache POI tutorial: Read excel files in java using POI Write excel files in java using POI Working with formula in excel using POI How to set style in excel using POI In this post, we will see how to set and evaluate formulas in excel using Apache POI. Set formula for a cell: […]

In this post , we will see how to set style in excel using apache poi. You can put cell style with below code: [crayon-676805d68e290856671917/] Java Program : [crayon-676805d68e294328624496/] When you run above program, you will get following output: [crayon-676805d68e296040461540/] Lets see content of CountriesDetails.xlsx now.

In this post, we will see how to write excel in java using Apache POI example. About Apache POI project : The Apache POI Project’s mission is to create and maintain Java APIs for manipulating various file formats based upon the Office Open XML standards (OOXML) and Microsoft’s OLE 2 Compound Document format (OLE2). In short, […]

In this post, we will see how to read excel in java using Apache POI example. About Apache POI project : The Apache POI Project’s mission is to create and maintain Java APIs for manipulating various file formats based upon the Office Open XML standards (OOXML) and Microsoft’s OLE 2 Compound Document format (OLE2). In […]

In this post, we will see how to detect OS which you are using. You can use System.getProperty(“os.name”) to get current OS name. Sometimes , we need to write logic based on OS, so we get use this logic to detect current OS. Java Program: [crayon-676805d68e698177174404/] I am using Mac os to run above program. […]

In this post, we will see how to get user profile’s home directory in java. It is quite simple, we can use System.getProperty(“user.home”) to get it. Java program: [crayon-676805d68e75e222656896/] When I ran above program, I got below output: [crayon-676805d68e761807437461/]