Java

URL: https://www.progressiverobot.com/log4j-levels-example-order-priority-custom-filters/ If you have used log4j, you will notice that there are many methods to log messages. For example: logger.trace("My Log message"); logger.debug("My Log message"); logger.info("My Log message"); Actually they corresponds to log4j levels. Log4j Levels Log4j provides many logging levels. Below is the complete list. TRACE: The TRACE Level designates finer-grained informational events […]

URL: https://www.progressiverobot.com/java-json-example/ Welcome to the Java JSON Example Tutorial. JSON (JavaScript Object Notation) is text-based lightweight technology for generating human readable formatted data. JSON represent object data in the form of key-value pairs. We can have nested JSON objects too and it provides an easy way to represent arrays also. Java JSON ![java json, java […]

URL: https://www.progressiverobot.com/java-file-path-absolute-canonical/ Today we will look into the Java file path. Java File path can be abstract, absolute or canonical. Java File Path java.io.File contains three methods for determining the file path, we will explore them in this tutorial. getPath(): This file path method returns the abstract pathname as String. If String pathname is used […]

URL: https://www.progressiverobot.com/relational-operators-in-java/ Relational Operators in Java are used to comparing two variables for equality, non-equality, greater than, less than, etc. Java relational operator always returns a boolean value – true or false. Relational Operators in Java Java has 6 relational operators. \== is the equality operator. This returns true if both the operands are referring […]

As Oracle Corporation has introduced some Functional constructs in Java SE 8, now-a-days most of the Interviewers are interested to ask some questions about Functional Programming. As a Java/Groovy/Scala Developer or any Functional Programming Developer, we should learn the following questions and answers to clear interviews: … And More What is Functional Programming? What are […]

URL: https://www.progressiverobot.com/priority-queue-java/ Every now and then we need to process items of a queue in a particular order. Priority queue is a Data Structure that does the job. Java priority queue is different from “normal” [queue](/community/tutorials/java-queue). Instead of “First-In-First-Out”, it retrieves the items in order of their priority. Priority Queue Java The java.util.PriorityQueue class, provides […]