This Java tutorial teaches you how to declare ... Although you can initialize an instance field through direct assignment, it’s more common to perform this initialization in a constructor ...

Can have instance mutable fields, parameters, or local variables. Only functional interfaces can use the lambda feature in Java. Abstract classes with only one abstract method cannot use lambdas.

Recall that in Java, two object instances are not considered equal just because they have the same values for all their fields. Java uses the == operator to determine whether two references are ...