Which one of these primitive types is unsigned?

Can you mark an interface as final?

Difference between Vector and ArrayList?

Any valid program compiled under one version of Java...

Which is *not* a method in java.lang.String?

What is the command to run an executable JAR file named program.jar?

Which access modifier makes variables and methods visible only in the class where they are declared?

Which is not a valid lambda expression?

Using Java's Reflection API, you can use _ to get the name of a class and _ to retrieve an array of its methods.

Java programmers commonly use design patterns. Some examples are the _, which helps create instances of a class, the _, which ensures that only one instance of a class can be created; and the _, which allows for a group of algorithms to be interchangeable.

How do you force an object to be garbage collected?