default methods in interface in java | main() method in interface in java in hindi

Default and static methods in interface
In Java8 and above, an interface declaration can contain method signatures, default methods, static methods and constant definitions.
The only methods that have implementations are default and static methods.
Note:
1. From Java8 and above we can define static methods and default methods.
2. So an interface can contain main method also, as main is also static method.

default method
A default method is defined using default keyword inside the interface.
Before Java 8, interfaces could have only abstract methods.
The implementation of these methods has to be provided in a separate class.
So, if a new method is to be added in an interface, then its implementation code has to be provided in the class implementing the same interface.
To overcome this issue, Java 8 has introduced the concept of default methods which allow the interfaces to have methods with implementation without affecting the classes that implement the interface.



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