We have already seen examples of generating PDF in Java using iText and generating PDF in Java using OpenPDF. In this post we’ll learn about another option for generating PDF in Java using Apache PDFBox. Apache PDFBox library The Apache PDFBox library (https://pdfbox.apache.org/) is an open source Java tool for…
In this post we’ll see how to create a password protected PDF in Java using OpenPDF library and how to read an encrypted PDF in Java using OpenPDF. OpenPDF is open source software with a LGPL and MPL license. To know more about OpenPDF library and PDF examples check this…
In this tutorial you’ll see how to sort stream of objects on multiple fields. Sort stream of objects on multiple fields To sort a stream of objects on multiple fields you need to use two methods- 1. Stream<T> sorted(Comparator<? super T> comparator)– sorts the elements of this stream according to…
In the Java Stream API tutorial we have gone through the intermediate and terminal operations, in this tutorial we’ll go through Java Stream filter() method in detail. Java Stream filter method filter() is an intermediate operation which returns a stream consisting of the elements of this stream that match the…
HashMap internal implementation in Java or how does HashMap work internally in Java is a very important interview question. Some of the important points that you should know are- Where does HashMap store its elements internally? What is the term “bucket” in HashMap? What is hashing concept and how does…
Java 8 onward a new feature has been added to the interface in Java known as default method in Java interface. With the inclusion of default methods, an interface in Java can have a default implementation for a method. Note that in a normal traditional form of interface all the…
In this tutorial we’ll see some examples of Collectors.groupingBy() method in Java Stream API. Collectors.groupingBy() method works similarly to “group by” statement in SQL which groups the elements as per the specified columns. This method also groups the elements according to the passed property and returns grouped result as a…
In this tutorial we’ll see how to use Collectors.joining() method to concatenate the input elements into a String. It is a handy utility method provided by the Collectors class in Java Stream API to quickly convert array elements or elements in a collection to String. There are three overloaded Collectors.joining()…
limit(long maxSize) method in the Java Stream API truncates the stream so that it is no longer than maxSize in length and returns the new stream with limited elements. limit method in Java Stream Syntax of the method is as given below. Stream<T> limit(long maxSize) Here maxSize is the limit…
In this article we’ll see how to write to Excel file in Java using Apache POI library. If you have to read an Excel file in Java you can check this post- Read Excel File in Java Using Apache POI Table of contents Apache POI Maven dependencies for Apache POI…
