Welcome to the Java 101 study guide. This guide complements " Class and Object Initialization." It provides a glossary of terms specific to that article, new homework, solutions to last month's ...

Object-oriented systems are usually partitioned into layers of related responsibilities and only dependencies in one direction are allowed, from higher layers (more specific, less reusable) to lower ...

Get started modeling entities and relationships for Java data persistence, using an example application based on Java 21 with Hibernate 6.3.

The Mongo object comes from the Java driver written by the guys over at 10gen. This example opens a connection to a local MongoDB instance and uses the mjormIsFun database.

Typically a program uses fields and methods of a Java class only after creating the instance of an object . The same with manufacturers - they create thousands of game copies based on the same ...

According to the JavaDoc, the Consumer interface accepts any type of object as input. The java.util.function.Consumer class has one non-default method named accept which takes a single object as its ...

But how many developers understand how HashMap works internally? A few days ago, I read a lot of the source code for ...

Learn about serialization in Java with our comprehensive tutorial. We provide examples to help you understand how serialization works.