Instance main methods and unnamed classes, coming in Java 21, will forever change how developers learn Java and bootstrap applications. Why? They provide a simple, clean and concise syntax to launch ...

import java.util.concurrent.ExecutorService ... But there is a very high chance that we will end up with two instances due to the Thread.sleep method. Now, looking at the code again, notice ...

Must qualify the allocation with an enclosing instance of type GameTree (e.g. x.new A() where x is an instance of GameTree). GameTree.java line 146</pre> ...