When to use interfaces in Java. Interfaces are very useful for decoupling code and implementing polymorphism.We can see an example in the JDK, with the List interface: ...

Java’s interface language feature confuses many Java newbies. Many mistakenly assume that interfaces only sidestep Java’s failure to support multiple implementation inheritance.

There are over 40 functional interfaces listed in the java.util.functions package, which can make the prospect of functional programming in Java a somewhat daunting task. ... Learn Java lambda syntax ...