See the Java 101 Java interfaces tutorial for a more in-depth introduction to using interfaces in your Java programs, including where and where not to use default, static, and private methods.

The functional Predicate interface gets used extensively by the Java 8 Streams API. Any developer who wants to master functional programming in Java will need to be comfortable with the Predicate ...

Java allows classes to implement multiple interfaces — a capability known as multiple interface inheritance. Suppose you want to write a program that counts the number of times you have failed ...