Study tips 1Z0-851

Which three are valid?

which change allows this code to compile?

Which two java commands entered at the command line will run MainClass?

Which three code fragments, added individually at line 29, produce the output 100?

Which three, taken independently, will allow the developer to use the Paper class while compiling the Book class?

What is the result?

Which two, placed on line 13, will produce the output gobstopper?

What is the result?

which line does the Object created in line 5 become available for garbage collection?

What is the result?