Analyze the following code and indicate, for each line, whether autoboxing, unboxing, or neither occurs when the assignment operator is evaluated: Double a = 20.5; // 1 occurs double b = a; // 2 occurs   1   : [1]   2   : [2]

You have files Dessert.java, BlueberryMuffin.java, and a driver class named Driver.java. Fill in the correct visibility modifiers so that the comments in the class BlueberryMuffin and Driver’s main method are upheld. public class Dessert {   1 void eat() { /*compiles*/ }   2 void split() { /*compiles*/ }   3 void purchase() { /*compiles*/ } } —– in a separate file in a different package/directory —– public class BlueberryMuffin extends Dessert {   public void nom() { split(); // doesn’t compile purchase(); // compiles }} —– in a separate file in a different package/directory —– public class Driver { public static void main(String[] args) {        BlueberryMuffin b = new BlueberryMuffin();        b.eat(); // compiles        b.split(); // doesn’t compile        b.purchase(); // doesn’t compile }}   1   : [1]  2   : [2]  3   : [3]

Fill in the blanks to implement the toString method. public class Flag {    private double height;    private double width;    private String color;    public 1 toString( 2 ) {       3    }}   1  :[1]   2  :[2]   3  :[3]

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

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

You have files Dessert.java, BlueberryMuffin.java, and a driver class named Driver.java. Fill in the correct visibility modifiers so that the comments in the class BlueberryMuffin and Driver’s main method are upheld. public class Dessert {   1 void eat() { /*compiles*/ }   2 void split() { /*compiles*/ }   3 void purchase() { /*compiles*/ } } —– in a separate file in a different package/directory —– public class BlueberryMuffin extends Dessert {   public void nom() { split(); // doesn’t compile purchase(); // compiles }} —– in a separate file in a different package/directory —– public class Driver { public static void main(String[] args) {        BlueberryMuffin b = new BlueberryMuffin();        b.eat(); // compiles        b.split(); // doesn’t compile        b.purchase(); // doesn’t compile }}   1   : [1]  2   : [2]  3   : [3]

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

Given 3 classes (Tulip, Flower, and Plant), Tulip can inherit from both Flower and Plant with the following syntax: public class Tulip extends Flower, Plant { /* valid class definition */}

   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   : [1]  2   : [2]  3   : [3]  4   : [4]

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