map(name -> { // keep only last names String ... Streams and lambdas are an incredibly useful way to work with Java’s collections. Functional programming is in general a great addition to ...

As demonstrated in the Arrays section of the Java Tutorials, the System class provides an arraycopy method that can be used to copy the contents from one array into another. The method below shows ...

The Map interface represents an abstract data ... We've looked at the fundamentals of the Java Collections Framework and seen how to create new data structures based on abstract base classes ...

It seems like an oversight for the standard Java API not to have a collection class that allows a key to have multiple values. If this is an application requirement, the three best ways to solve the ...

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 ...