Which Map implementation is safe for modification in a multi-threaded program?

TreeMap class is used to implement which collection interface?

Which 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...

How would you convert a String to an Int?

What type of variable can be assigned to only once?

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.