Why does this code output 02 in java-8 but o2 in java-9 or above?Most likely due to JDK-6609854 and JDK-8189343 which reported negative nested character classes handling (in your example [^[0-9-]]). This behavior was fixed in 9 and 10, but not backported to 8. The bug for Java 8 is...
Say I have some map entries like so:I get this error:Cannot resolve method 'of(java.util.Map.Entry, java.util.Map.Entry, java.util.Map.Entry)'
I got in touch with a new feature since java-9 called Collectors.flatMapping that takes place as a downstream of grouping or partitioning. Such as (example taken from here):
Looking for how to use Java lambda functions so Consumer can process all objects provided by a Supplier, and get rid of the explicit while loop and null checks.
The Optional.or method was added in Java 9. This is the method signatureWhy is the type parameter of the Supplier taking ? extends Optional rather than just Optional, since Optional is a final class?
This question already has an answer here:Why does the following condition return true with JDK 8, whereas it returns false with JDK 9?
The Optional.or method was added in Java 9. This is the method signatureWhy is the type parameter of the Supplier taking ? extends Optional rather than just Optional since Optional is a final class.
I am not able to understand that after module system is introduced in our java language. Is java9 and above still platform independent or not ? I am asking this question because I have read that now every application will have its own jre inside it. So, how will this...
Class.newInstance was deprecated in Java 9:can be replaced byThe problem is that getDeclaredConstructor returns any constructor without regarding the access level.
In Java, overriding the finalize method gets a bad rap, although I don't understand why. Classes like FileInputStream use it to ensure close gets called, in both Java 8 and Java 10. Nevertheless, Java 9 introduced java.lang.ref.Cleaner which uses the PhantomReference mechanism instead of GC finalization. At first, I thought...