(Questions regarding Java)

3. Which of the following about abstract classes is false? (1 point) An abstract class can be extended An abstract class can be contained in a non-abstract class An abstract class cannot be instantiated Abstract classes can have public and private instance variables 4. Which of the following is false? (1 point) The correct method header for compareTo in the string class is public int compareTo (Object o) You can define a compareTo method without implementing the comparable interface. System.out.println (new Integer(3).compareTo (new Integer (5))) This prints"-1 O If s is a String object, the expression s instanceof Comparable is true