Web Reference: Nov 27, 2025 · We define interfaces for capabilities (e.g., Comparable, Serializable, Drawable). A class that implements an interface must implement all the methods of the interface. Only variables are public static final by default. Before Java 8, interfaces could only have abstract methods (no bodies). There are a number of situations in software engineering when it is important for disparate groups of programmers to agree to a \"contract\" that spells out how their software interacts. Each group should be able to write their code without any knowledge of how the other group's code is written. Generally speaking, interfaces are such contracts. An interface is a fully abstract class that helps in Java abstraction. In this tutorial, we will learn about interfaces in Java with the help of examples.
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