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