Book Image

Java 9 High Performance

By : Mayur Ramgir, Nick Samoylov
Book Image

Java 9 High Performance

By: Mayur Ramgir, Nick Samoylov

Overview of this book

Finally, a book that focuses on the practicalities rather than theory of Java application performance tuning. This book will be your one-stop guide to optimize the performance of your Java applications. We will begin by understanding the new features and APIs of Java 9. You will then be taught the practicalities of Java application performance tuning, how to make the best use of garbage collector, and find out how to optimize code with microbenchmarking. Moving ahead, you will be introduced to multithreading and learning about concurrent programming with Java 9 to build highly concurrent and efficient applications. You will learn how to fine tune your Java code for best results. You will discover techniques on how to benchmark performance and reduce various bottlenecks in your applications. We'll also cover best practices of Java programming that will help you improve the quality of your codebase. By the end of the book, you will be armed with the knowledge to build and deploy efficient, scalable, and concurrent applications in Java.
Table of Contents (11 chapters)

Converting Excel to JSON

Converting Excel data to JSON is an activity that programmers need to perform when producing a conformity in a Java application. The right conversion requires the correct reading of the headers of rows and columns and then creating the required array structure for saving data in terms of JSON structures.

The best way to do this is to create a list of the items, and then work out a transfer to a JSON data form. This happens when you create a class in a software tool such as POJO and keep using relevant array structures to save the information that you have in terms of the rows and columns of a spreadsheet.

One way to perform the function of reading data from the different cells of a spreadsheet and putting it into a relevant JSON array is in the following manner:

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException...