The Diamond Operator reduces some of Java’s verbosity surrounding generics by having the compiler infer parameter types for constructors of generic classes.

Pattern matching was first introduced to the instanceof operator in Java 16 (JEP 394), which enabled the operator to take a type pattern and perform pattern matching.

Java 7 gave us the diamond operator, which reduces the verbosity of generics. Gone were the days of having to repeat the type used to instantiate the generic class after invoking the new operator!