public abstract class Landmark { public abstract int countVisitors();} Consider the class shown above. Which of the following class definitions will NOT compile?

   Noodle n1 = new Pasta(); Noodle n2 = new Ramen(); Pasta p = new Pasta(); Ramen r = new Ramen();  For the class hierarchy and declarations above, correctly indicate whether each of the following statements will compile and what will happen at runtime (runs correctly or runtime exception). It may be helpful to use scratch paper to keep track of each variable’s static and dynamic type. 1  Noodle noodle = (Noodle) r; 2   Ramen r1 = (Ramen) n1;  3  Ramen r2 = (Ramen) p; 4  Ramen r3 = (Ramen) n2;   1   :   2   :   3   :   4   :

public abstract class Athlete { public abstract void compete();} Consider the class shown above. Which of the following class definitions will NOT compile?

Given the following class hierarchy, identify whether the method operate is overloaded, overridden, or neither by the subclass: public class Doctor {   public void operate(int t, String d) { /* implemented */ } } public class Surgeon extends Doctor {   public void operate(int time, String date) { /* implemented */ } } 

public abstract class Athlete { public abstract void compete();} Consider the class shown above. Which of the following class definitions will NOT compile?

Fill in the blanks to implement the toString method. public class Dog {    private String name;    private String owner;    private int age;    public 1 toString( 2 ) {       3    }}   1  :   2  :   3  :

Given the following class hierarchy, identify whether the method operate is overloaded, overridden, or neither by the subclass: public class Doctor {   public void operate(int t, String d) { /* implemented */ } } public class Surgeon extends Doctor {   public void operate(int time, String date) { /* implemented */ } } 

You have files VendingMachine.java, Cola.java, and a driver class named Driver.java. Fill in the correct visibility modifiers so that the comments in the class Cola and Driver’s main method are upheld. public class VendingMachine {   1 void pay() { /*compiles*/ }   2 void shake() { /*compiles*/ }   3 void choose() { /*compiles*/ } } —– in a separate file in a different package/directory —– public class Cola extends VendingMachine {   public void cocaCola() { pay(); // doesn’t compile choose(); // compiles }} —– in a separate file in a different package/directory —– public class Driver { public static void main(String  2   :   3   :

Assume class Child inherits from class Parent. We can instantiate an abstract Child class as long as a concrete Parent class exists by writing the following statement: Child c = new Child();

Fill in the blanks to implement the toString method. public class Dog {    private String name;    private String owner;    private int age;    public 1 toString( 2 ) {       3    }}   1  :   2  :   3  :