Validate Email Address in Java

In this Java core tutorial, we learn how to use the regular expression in Java to check whether an email address is valid or not.

Check a String Is a Valid Integer in Java

In this Java core tutorial, we learn how to check if a String value is a valid integer value or not in Java program.

Get Current Time in Java

In this Java core tutorial, we learn how to get current time in milliseconds in a Java program.

Parse String into Integer value in Java

In this Java core tutorial, we learn how to convert a String value into int value in Java application.

Read and Parse CSV File in Java using Apache Commons CSV

In this tutorial, we learn how to parse CSV files in a Java application using Apache Commons CSV library. Via different Java code examples we learn how to create the CSV parser from File, InputStream, Path or Reader objects.

Read and Parse CSV Content from an URL in Java using Apache Commons CSV

In this tutorial, we are going to show how to read and parse CSV content from an URL using Apache Commons CSV library.

Read and Parse CSV Content from a String in Java using Apache Commons CSV

In this tutorial, we are going to learn how to read and parse CSV content from a Java String using Apache Commons CSV library.

Write and Read CSV File in Java using Apache Commons CSV

In this tutorial, we are going to learn how to write and read CSV files in Java applications using Apache Commons CSV library.

Create Temporary File in Java

In this tutorial, we are going to learn how to create a new temporary file in a Java program by using core Java API.

Convert Array to List in Java

In this tutorial, we are going to show how to convert an array in Java into a List object. We show different example programs that use core Java APIs to convert arrays in different Java versions.