Java SE 10 (March 2018) introduced type inference for local variables. Java Language Architect Brian Goetz explains the feature.

Java SE 10 introduced var as the type of a local variable declaration and a lambda formal parameter. The compiler treats var as an identifier with special meaning, but it isn’t considered to be ...

The "Understanding Java threads" series concludes by uncovering some of the loose ends of threading: thread groups, volatility, thread-local variables, timers, and thread death.

Some words can’t be utilized as variables, identifiers or classes, as they are part of Java’s syntax. Examples of keywords include: abstract, boolean, byte, class and interface.

Java SE 10 (March 2018) introduced type inference for local variables. Previously, declaring a local variable required a manifest (explicit) type declaration.