单项选择题
Given: What is the result?（）
A.Exception B.A,B,Exception C.Compilation fails because of an error in line 20. D.Compilation fails because of an error in line 14. E.A NullPointerException is thrown at runtime.
多项选择题 Which two code fragments are most likely to cause a StackOverflowError?（）
多项选择题 Given: Which four code fragments, inserted independently at line 7, will compile? （）
单项选择题 Given: Which statement is true about the class of an object that can reference the variable base? （）
