Let’s take a look at the Runnable interface in the java. What is an interface in Java?Simply put, an interface is a collection of methods with empty bodies. Sometimes I thought interfaces are not necessary and redundant.Over the time, by coding and reading a lot, I have been grasping a strong understanding about interfaces and realizing its importance and roles in designing good software programs.Therefore, I hope what I am going to share with you today about interfaces would help you save time on understanding this important concept in Java programming. However, it can be achieved with interfaces, because the class can implement multiple interfaces. 2) Java does not support 'multiple inheritance' (a class can only inherit from one superclass). Because the program is still able to run with or without interfaces, right?Did you think so in the beginning time you learn about interfaces in Java?I didn’t understand the benefits of using interfaces when I started learning Java. 1) To achieve security - hide certain details and only show the important details of an object (interface). At first glance, many see that interfaces increase the amount of code and complexity of a program. A class implements an interface if it declares the interface in its implements clause, and provides method bodies for all of the interface’s methods. Since Java 8, you can also create default methods. An interface in Java is a list of method signatures, but no method bodies. Java Interfaces Explained with Examples 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. Java reflection get implemented interfaces example program code : The provides the methods to examine the runtime properties of the object. Interfaces may contain static and final variables which are useful if you want. Java’s interface is a useful language mechanism for expressing an abstract data type. Perhaps one of the most confusing concepts for beginners in Java is the concept of interface. All fields declared inside an interface are public, static and final by default.
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