Build your Java skills from the ground up by working on simple tasks and beginner-friendly projects. Challenge yourself with more complex Java problems, including those focused on multithreading and ...

Have you ever wondered how Java seamlessly combines its primitive data types with object-oriented programming? Enter wrapper classes, an important but often overlooked Java feature. These special ...

A frequently asked question in a Java interview is: How to implement a Java HashMap? Java job seekers must fully grok this important concept if they want to ace the interview. The HashMap tutorial ...

This bug is only reproducible starting with release 7.1.0+. It does not reproduce with 7.0.0. Make sure, to test with the latest PMD version. We are finding that the Copy Paste Detector no longer ...

There are various instances of this issue that we get such as JAVAC’, JRE, ‘MVN’, JAR’ is not recognized as an internal or external command, operable program or batch file, ‘Java’ is not recognized as ...

There are several ways to find duplicates in a Java List, array or other collection class. The following list describes some of the most commonly used approaches: Use a method in the Java Streams API ...

Java is one of those OOPs based languages, along with Python and C++, that’s in demand right now. So, if you want to ride the bandwagon and use the language, you must download it on your system. Not ...

I found a bug using mockito on JDK 17 (Temurin) and Linux Ubuntu 22.10. If we spy the HashSet and after add some value, it should throw NullPointerException. On JDK 11 it works fine.