Mariela
28 de Junio del 2008

holass necesito ayuda con unos ejercicios de java: lo necesito pa hoy si pueden decir la rpta de cada uno y el porque de que es esa rpta xfissssssssssss

15. What is the most restrictive access modifier that can be applied to a member if that member must be accessible to members of a subclass within the same package as the superclass?






public


private


abstract


protected


default access



16. Which can be overridden? (Choose one.)






native void methoda();


final void methoda() {}


void final methoda() {}


synchronized final void methoda() {}



17. Which declaration ensures that a class cannot be subclassed?






abstract class MyClass { }


final public class MyClass { }


final abstract class MyClass { }


static private class MyClass { }


static protected class MyClass { }





18. Which is true about the default constructors? (Choose one.)






The default constructor is always public


The default always invokes the no-arg superclass constructor


The default constructor inherits the arguments of the superclass constructor


The compiler creates a default constructor if the class does not have a no-arg constructor defined


19. Which modifier limits access to a method of a public class to members of the same class?






final


public


private


protected


default access



20. Which of the following class level (nonlocal) variable declarations will not compile?





protected int a;


transient int b=3;


public static final int c;


volatile int d;


private syncronized int e;



21. Given:

1. public class Test {
2. public static void main(String [] args) {
3. System.out.println(args.length > 4 &&
4. args[4].equals("-d"));
5. }
6. }

If the program is invoked using the command line:
java Test One Two Three -d
What is the result?






true


false


compilation fails


An exception is thrown at runtime.



22. Given:

1. public class X {
2. private static int a;
3. public static void main(String [] args) {
4. modify(a);
5. System.out.println(a);
6. }
7. public static void modify(int a) {
8. a++;
9. }
10 }

What is the result?






0


1


Compilation fails


An exception is thrown at runtime.