Web Reference: In Java, interface doesn't allow you to declare any instance variables. Using a variable declared in an interface as an instance variable will return a compile time error. 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). Jul 23, 2025 · In Java, an interface is an abstract type that contains a collection of methods and constant variables. It is one of the core concepts in Java and is used to achieve abstraction, polymorphism and multiple inheritances.
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