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?

The 'synchronized' keyword does the following

If 'A' is a class, then what does the statement 'A a1;' do?

Can a non-generic class have a generic constructor?

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?

What kind of relationship does "extends" denote?

What is a valid use of the hashCode() method?

Which functional interfaces does Java provide to serve as data types for lambda expressions?