// There are two ways to achieve abstraction in java // Abstract class (0 to 100%) and Interface (100%) // Abstract class needs to be extended and its method implemented.

Item 20: Prefer interfaces to abstract classes（接口优于抽象类） Java has two mechanisms to define a type that permits multiple implementations: interfaces and abstract classes. Since the introduction of ...

Method and variable handles vs. Java reflection To truly understand MethodHandles and VarHandles —what they do and why they are useful—it’s helpful to know a few things about reflection in Java.

Get a deep dive into using method references in your Java programs, including stream operations, event listeners, and constructors and factories.