Nov 15, 2013 · The double colon, i.e., the :: operator, was introduced in Java 8 as a method reference. A method reference is a form of lambda expression which is used to reference the …

How do I get a method's execution time? Is there a Timer utility class for things like timing how long a task takes, etc? Most of the searches on Google return results for timers that schedule

Another example of this is when you use (Java 9+) java SomeClass.java to compile and run a class. If the class depends on another class that you haven't compiled (or recompiled), you are …

The equals method for class Object implements the most discriminating possible equivalence relation on objects; that is, for any non-null reference values x and y, this method returns true if …

Aug 29, 2008 · How do I use JUnit to test a class that has internal private methods, fields or nested classes? It seems bad to change the access modifier for a method just to be able to …

Oct 29, 2011 · The keyword break in Java can be used for breaking out of a loop or switch statement. Is there anything which can be used to break from a method?

Jan 10, 2012 · Put your test in the same package, but a different source folder (src/main/java vs. src/test/java) and make those methods package-private. Imo testability is more important than …

Jul 12, 2021 · 1 String class overrides the default implementation of the equals () method of the Object class. The equals method code that you have provided is not from String class but from …

If you synchonize on the method you lock the whole object, so two thread accessing a different variable from this same object would block each other anyway. That's a bit misleading. …

A static method cannot tell to which particular object the non-static member belongs to. Since there is no existing object, the non-static method doesn't belong to any object. Hence there is …