Java - Interface
Covers topics
1. Interface default :
variables : public static final (i.e constants )
methods : public abstract
2. Interface methods :
1. defaults modifiers are public abstract.
2. deafault methods are allowed from java 8
3. private methods allowed
4. static methods are allowed, as they are associated of class and not object and cannot be overridden
3. Interface Inheritance :
1. Multiple inheritance are allowed i.e public interfaceIC extends IA, IB
2. In case of collision i.e both parents have default concrete methods then child class needs to override it.
4. Inheritance :
1. same datatype : extends
2. different datatype : implements
NOTE:
1. public, protected concrete instance methods not allowed
2. instance variables not allowed
3. Constructors, instance-block, static-block block not allowed
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