格林模拟试题三（上）(5)

 question 15)

which of the following statements are true?

1) constructors cannot have a visibility modifier
3) constructors can only have a primitive return type
 

question 16)

what will happen when you attempt to compile and run the following class?

class base{base(int i){ system.out.println("base"); }}class severn extends base{public static void main(string argv){ severn s = new severn(); }void severn(){ system.out.println("severn"); }}

 

1) compilation and output of the string "severn" at runtime
3) compilation and no output at runtime

 

question 17)

which of the following statements are true?

1) static methods do not have access to the implicit variable called this
3) a static method may not be overriden to be non-static