格林模拟试题二(上)(2)

  question 4)

what will happen when you attempt to compile and run this code?

class base{
public void another(){
}
public class abs extends base{
abs a = new abs();
}

public void myfunc(){
}

public void amethod(){
}

1) the code will compile and run, printing out the words "my func"
3) the code will compile but complain at run time that the base class has non abstract methods

question 5)

why might you define a method as native?

1) to get to access hardware that java does not know about
3) to write optimised code for performance in a language such as c/c++

question 6)

what will happen when you attempt to compile and run this code?

class base{
system.out.println("amethod");
}

public class fin extends base{
base b = new base();
}

1) compile time error indicating that a class with any final methods must be declared final itself
3) run time error indicating that base is not defined as final