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 ...

The SOLID open-closed principle in Java asserts that a well-designed software component will be open for ongoing extension, but closed to edits and modification. In other words, a Java class that ...

Do you need to know how to sort Java objects in a collection, array, or map? Here's how to use the Comparable and Comparator interfaces and avoid ClassCastExceptions. Programmers frequently need to ...

The Observer pattern is probably one of the best ways to reduce coupling between objects. For example, if you are writing a typical application, you may decide to provide a factory or manager that ...