When obj is a regular Java object, structure-like. Classes, enums, and arrays (which all inherit from ), as well as interfaces. If the classes that implement an interface do not implement all the methods of the interface, then such a class needs to be defined as abstract. 105 I am just trying to understand why all fields defined in an Interface are implicitly static and final. For static fields, obj can be a string representing the fully qualified named of the corresponding Java class. In Java, every type is either a reference or a primitive. So, to answer your question, Id rather use the second solution. The reason is, many classes could implement the interface, thus providing many access points to the same constants. Java Docs says interfaces cannot have fields. Since Java 8, you can also create default methods.Ĭlasses that implement an interface are thought to be signing a contract and agreeing to perform the specific behaviors listed in the interface. It is considered a bad practice to put constants in interfaces and to implements those interfaces to access the constants. Can we declare the variables of a Java interface private and protected - Interface in Java is similar to class but, it contains only abstract methods and fields which are final and static.Private fields of an interfaceIf the fields of the interface are private, you cannot access them in the implementing class. Interface in Java is a bit like the Class, but with a significant difference : an interface can only have method signatures, fields and default methods.
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