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Welcome to your Java 8 - easy test

Which are primitive data type in Java?
a and b are non null variables pointing on instances of a class in which equals() and hashcode() has been properly implemented. Which are the correct sentences?
Can an anonymous class can be declared in a static method?
Which interface must a class implement in order to be executed in a separate thread?
Which method threads use to pause their execution until signaled by another thread to continue?
How can you define and start a thread?