Interfaces are collections of method signatures. A interface type can hold any value that implements those methods. The empty interface is an interface type that specifies zero methods. A type assertion provides access to an interface underlying concrete value. Two interfaces are equal if they have equal concrete values and identical dynamic types, or if both are nil.

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Java 8 Streams filter examples. Simple examples comparing the classic approach pre-Java 8 and using the new Java 8 functionalities.

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How to create tiny HTTP server in Java using ServerSocket class.

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Enum examples in Java. Simple enum usage. How to convert String to Enum object. Enum object with fields and methods.

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How to compare dates in Java using Date (compareTo, before, after, equals), Calendar(before, after, equals) and LocalDate(isBefore, isAfter, equals) classes.

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Client Server Socket example in Java. Client example reading the input from the console. Simple echo server example.

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