Java 8 – Filter a null value from a Stream
Filter a null value from a Stream by using Stream.filter(x -> x!=null). Alternatively, filter with Objects::nonNull method reference
Java 8 Stream.iterate examples
In Java 8, we can use Stream.iterate to create stream values on demand, so called infinite stream. The stream.iterate was enhanced in Java 9. It supports a predicate (condition) as…
Java Prime Numbers examples
The following 3 Java examples will print a list of all the prime numbers up to 1,000: 1 - Java 8 Stream and BigInteger, 2 - Plain old Java ,…
Java 8 Parallel Streams Examples
Few Java 8 examples to execute streams in parallel: BaseStream.parallel() or Collection.parallelStream() . We can check to see that by default, parallel streams use `ForkJoinPool`. We can use Parallel streams…
Java 8 UnaryOperator Examples
In Java 8, UnaryOperator is a functional interface and it extends Function. The UnaryOperator takes one argument, and returns a result of the same type of its arguments. The Function…
Java 8 BinaryOperator Examples
In Java 8, BinaryOperator is a functional interface and it extends BiFunction. The BinaryOperator takes two arguments of the same type and returns a result of the same type of…
Java 8 – StringJoiner example
In this article, we will show you a few StringJoiner examples to join String. Join String by a delimiter and starting with a supplied prefix and ending with a supplied…
Java – How to join List String with commas
In Java, we can use String.join(",", list) to join a List String with commas. We also can use Stream Collectors.joining or even in old days we create a custom method…
Jackson – How to parse JSON
Jackson provide writeValue() and readValue() methods to convert Java objects to / from JSON. mapper.writeValue – Java Objects to JSON. mapper.readValue – JSON to Java Objects.
Java 8 Stream.reduce() examples
In Java 8, the Stream.reduce() combine elements of a stream and produces a single value, with 2 arguments: 1 - identity is default or initial value, and 2 - BinaryOperator…