For an introduction to Java interfaces, including the difference between classes and interfaces, see my Java 101 tutorial Working with interfaces in Java. Nesting interfaces in classes.

In addition to writing for JavaWorld, he has written his own Java book for beginners— Java 2 by Example, Second Edition (Que Publishing, 2001; ISBN: 0789725932)—and helped write Using Java 2 ...

Learn about serialization in Java with our comprehensive tutorial. We provide examples to help you understand how serialization works. ... Java provides the Externalizable interface.

So to learn Java lambda syntax, you need to be familiar with its three component parts: The argument list; The arrow; The method body; To apply these concepts, we first need a functional interface. A ...

java.util.function.UnaryOperator @FunctionalInterface public interface UnaryOperator<T> extends Function<T,T> T apply(T t) Applies this function to the given argument. Parameter Types: T - the input ...