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java-8

How-to articles, tricks, and solutions about JAVA-8

:: (double colon) operator in Java 8

In Java 8, the :: (double colon) operator is used to refer to a method or a constructor.

java java-8

Break or return from Java 8 stream forEach?

To break or return from a Java 8 Stream.forEach() operation, you can use the break or return statements as you would normally do in a loop.

java foreach java-8 lambda

Class has been compiled by a more recent version of the Java Environment

If you get the error "class has been compiled by a more recent version of the Java Environment", it means that you are trying to run a class file that was compiled with a newer version of Java than the one you have installed.

java eclipse java-8 selenium firefox

Convert java.time.LocalDate into java.util.Date type

To convert a java.time.LocalDate into a java.util.Date type in Java, you can use the atStartOfDay() method of the LocalDate class to get a LocalDateTime object and then use the toInstant() method to convert it to an Instant object.

java java-8 java-time

Convert java.util.Date to java.time.LocalDate

To convert a java.util.Date object to a java.time.LocalDate object, you can use the java.time.Instant class to represent the date as an instant in time, and then use the java.time.LocalDateTime class to convert the instant to a date and time in the local

java datetime java-8 java-time

Error:java: javacTask: source release 8 requires target release 1.8

This error message usually indicates that you are trying to compile your Java code with a version of the javac compiler that is not compatible with the version of the Java language that your code is written in.

java java-8 intellij-idea

Find first element by predicate

To find the first element in a list that matches a certain condition, you can use the stream() method to create a stream from the list, and then use the filter() method to specify the condition that the element should satisfy. Finally, you can use the fin

java java-8 java-stream

Functional style of Java 8's Optional.ifPresent and if-not-Present?

The ifPresent() and ifPresentOrElse() methods of the Optional class in Java 8 provide a functional style way to perform different actions depending on whether the Optional object is empty or contains a value.

java java-8 functional-programming option-type

How can I parse/format dates with LocalDateTime? (Java 8)

In Java 8 and later, you can use the java.time.LocalDateTime class to represent a date and time without a time zone. To parse a date and time string into a LocalDateTime object, you can use the java.time.format.DateTimeFormatter class.

java datetime java-8 java-time timestamp

How can I turn a List of Lists into a List in Java 8?

You can use the flatMap method from the Stream API to turn a List<List<T>> (a list of lists) into a List<T> in Java 8. Here's an example of how you can do this:

java collections java-8

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