Roy Tutorials

Introduction Autocomplete is a feature in which an application predicts the rest of a word a user is typing. In graphical user interfaces, users can typically press the tab key to accept a suggestion or the down arrow key to accept one of several. Autocomplete speeds up human-computer interactions when it correctly predicts the word a user intends to enter…

Introduction I am going to show you how to show auto complete suggestion when users search for something by typing in the input field. Autocomplete allows users to have other suggested strings or values displayed on typing of the relevant text in the input field. You have also seen when you start a search on Google or other search engines,…

Introduction I am going to show you how to give auto complete suggesstion when users search for something by typing in the input field. Autocomplete allows users to have other suggested strings or values displayed on typing of the relevant text in the input field. You have also seen when you start a search on Google or other search engines,…

Introduction In this example I am going to show you how to work with filters in excel file on text column using Java and Apache POI library. The following list of custom filters for number columns can be implemented: Equals Does Not Equal Greater Than Greater Than Or Equal To Less Than Less Than Or Equal To Between Top 10…

Introduction In this example I am going to show you how to work with filters in excel file on text column using Java and Apache POI library. The following list of custom filters for text columns can be implemented: Equals Does Not Equal Begins With Ends With Contains Does Not Contain

Introduction In this tutorial I am going to show you how to work with different changes or versioning maintenance on database scripts without touching the original SQL scripts. So we will only work with the changes we need at a later point of time for our database. Let’s say you have created a table through SQL script using liquibase framework…

Introduction Here I am going to show you how to upload multiple images and display them one by one once images get uploaded using Python programming language. I am using here Flask as a web based framework on top of Python language. On the UI (User Interface) there is an input field which is used to select multiple files. To…

Java 8 Date In this tutorial I am going to show you how to add days, weeks, months, years to a particular date in Java 8 or later. Similarly I will also show how to substract days, weeks, months, years from a particular date. The date is actually LocalDate API in Java 8 or later. The one of the important…

Introduction In this tutorial I am going to show you how to create PDF file content with different formats using Java programming language. In this tutorial I am going to use iText library to generate the PDF document. Many applications require dynamic generation of PDF documents. The applications, where dynamically generated PDF is required, are banking system generating statements for…

Introduction In this tutorial I am going to show you how to use Python client to work with Apache kafka distributed stream processing system. I will create Kafka producer and consumer examples using Python language. KafkaConsumer is a high-level message consumer that consumes records from a kafka cluster. The consumer is not thread safe and should not be shared across…