Optional makes a method contract explicit for a caller, however, one may find such signature too verbose. Update: Java 8 includes the class java.util.Optional out-of-the-box, so there is no …

613 I am trying to do something in Java and I need something to wait / delay for an amount of seconds in a while loop.

System.out.println("Method is finished!"); Internally I'm using a class that implements Runnable and do some Reflection work to get the correct method object and invoking it. I want some …

Mar 6, 2017 · I am wondering when to use static methods? Say if I have a class with a few getters and setters, a method or two, and I want those methods only to be invokable on an instance …

May 24, 2016 · Afaik, Java and most typed languages don't overload methods or functions based on return type. For instance public int getValue(String name){} is indistinguishable from public …

The common way is to make the private method protected or package-private and to put the unit test for this method in the same package as the class under test. Guava has a …

Jan 27, 2012 · Using the annotation causes the Java compiler to generate warnings when the deprecated class, method, or field is used. The compiler suppresses deprecation warnings if a …

Nov 28, 2012 · In Java 8, methods can be created as Lambda expressions and can be passed by reference (with a little work under the hood). There are plenty of examples online with lambdas …

Aug 15, 2010 · In your "main" thread, create a new Thread class, passing the constructor an instance of your Runnable, then call start() on it. start tells the JVM to do the magic to create a …

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 …