An Interface in JAVA is able to achieve 100% abstraction as it only contains those methods which has no implementation (i.e. methods without body). In other words we can say interface can only contain method signature and fields. Starting JAVA 8 default and static methods can have implementat...
In the Java interface example above, we can see the way the Car and Motorcycle interfaces extend the Vehicles interface. The Vehicles interface contains two methods: hasWheels() and hasEngine(). Any class that implements interface Vehicles must meet these two requirements. If a class implements ...
Example of List Interface In JAVA: Let us discuss List Interface with the help of program. In this program objects of all the List implementations (Vector, ArrayList, LinkedList) are created and data of String type is added and then displayed, we have divided this program into 3 Steps that ...
An interface is just defined like a class but a keyword interface is used instead of the keyword class. It can contain either constants (final fields) or abstract method declarations or both. All the methods in an interface are public and abstract by default and all the fields are public, ...
Above method is old method of creating thread. As we have single abstract method in Runnable interface , we can consider it as functional interface, hence we
Why use an interface in java Interface Design Java Mostcommoninterview questions on Interface Interface fundamentals: Aninterfaceis just a contract, a description of the behavior animplementing classwill have. The implementing class ensures, that it will have these methods that can be used on it. ...
Inheritance in Java sets the parameters of a new class to include at least all the parameters of its parent class. Find out why this differs from...
How to implement encapsulation in java: 1) Make the instance variables private so that they cannot be accessed directly from outside the class. You can only set and get values of these variables through the methods of the class. 2) Have getter and setter methods in the class to set and ...
Comparable interface is mainly used to sort the arrays (or lists) of custom objects. Lists (and arrays) of objects that implement Comparable interface can be sorted automatically by Collections.sort (and Arrays.sort). Before we see how to sort an objects
DataSource ds = (DataSource) ctx.lookup("java:/comp/env/jdbc/MyLocalDB"); This is the way to get the JNDI resources defined to be used by the application. We could have written it in this way too; ctx = new InitialContext(); ...