Spring Boot Generate QR Code as Base64 String

This Java Spring Boot tutorial we learn how to generate QR code as a base64 string in Spring Boot application.

Java Get Current Date and Time

In this Java tutorial we learn how to get the current date and time in Java with different solutions.

Java Convert Number of Seconds to Hours Minutes Seconds String

In this Java tutorial we learn how to convert a number of seconds into a time String contains number of hours, minutes and seconds.

Java Get Index of Minimum Value in ArrayList

This Java core tutorial to show you how to get the index value of the minimum value in an ArrayList by using Java Collection API.

Get Screen Size in Java

This Java tutorial we learn how to get the size of the screen and return width and height values in pixels.

Spring Boot Generate QR Code Image Files

This Spring Boot tutorial we learn how to implement Spring Boot application to generate QR code image files.

Spring Boot Web Upload and Read QR Code Image

This Spring Boot tutorial to show you how to implement a Spring Boot web application which user can upload and decode a QR code image file.

Spring Boot Web Generate and Display QR Code

This Spring Boot tutorial to show you step by step to implement a Spring Boot web application which generate QR code from user input and display the QR code via a web page.

Spring Boot Download Multiple Files as Zip File

This Spring Boot tutorial will guide you how to implement download function for a Spring Boot web application which allow user to download multiple files as a .zip file.

Function interface in Java 8

The java.util.function.Function interface is a functional interface which represents a function that take one argument and return one output result. In this Java 8 tutorial we learn how to use the Function interface in Java program via different use cases.