Table of Contents
CAN interfaces have constructors SIB and IIB?
1) Can interfaces have constructors, SIB and IIB? No. Interfaces can’t have constructors, SIB and IIB.
Can we have IIB block and static block in same class?
IIB is also used to initialize variables. It will be executed after the execution of the static block if any static block is declared inside the class. Instance block executes before the constructor only when an instance of the class is created.
Can you have multiple interfaces Java?
Yes, a class can implement multiple interfaces. Each interface provides contract for some sort of behavior.
Are constructor and instance initialization block inherited to subclass?
Constructors are not members, so they are not inherited by subclasses, but the constructor of the superclass can be invoked from the subclass. In the same way,you cannot inherit static block .
What is static block and initializer block?
Introduction. In Java, we have a special block known as a Static Initialization Block. A Static Initialization Block is executed before the main( ) method. This is the main advantage of the Static Initialization Block in Java.
Can functional interface extend another interface?
A functional interface can extends another interface only when it does not have any abstract method.
Can an interface implement another interface in Java?
An interface cannot implement another interface in Java. An interface can extend any number of interfaces but one interface cannot implement another interface, because if any interface is implemented then its methods must be defined and interface never has the definition of any method.
What is IIB in Java?
In a Java program, operations can be performed on methods, constructors and initialization blocks. Instance Initialization Blocks or IIB are used to initialize instance variables. IIBs are executed before constructors. They run each time when object of the class is created.