2023 objects __________.

a. do not encapsulate

b. data persist forever after being instantiated

c. contain only accessor methods

d. have state and behavior

 

 

23. Given the following code fragment. (presume there is a Hat class with a constructor that requires the hat type | Assignment Collections

2. Which is the correct syntax for a mutator method?

a. public int getWeight() { return this.weight; }

b.  public boolean isDeclawed() { return this.declawed; }

c. public void getWeight() { return this.weight; }

d. public void setWeight(double weight) { this.weight = weight; }

 

3. Which statement shows the correct way to declare and initialize a named constant that represents absolute zero?

a. final int absoluteZero = -273.15;

b. final double absoluteZero = -273.15;

c. final int ABSOLUTE_ZERO = -273.15;

d. final double ABSOLUTE_ZERO = -273.15;

 

 4. In the following class: public class Height { private double height; private String unitsOfMeasurement; //************************ public Height()

{ this.unitsOfMeasurement = “in”; }

public void setHeight(double height)

{ this.height = height; this.unitsOfMeasurement = “cm”; }

public void setHeight(double height, String unitsOfMeasurement) { this.height = height; this.unitsOfMeasurement = unitsOfMeasurement; }

public void print() { System.out.println(this.height + ” ” + this.unitsOfMeasurement); } } // end class Height

 

Which method is the constructor?

The print method

The Height method

The setHeight method

This class does not implement a constructor.

 

 5. Java primitive types include _________.

 integer, double, string, boolean, long and float

integer, double, float, array, boolean and long

long, integer, string, array, float, double and character

long, double, character, float, integer and boolean

 

6. What is the name for the circled items in the following statement?

What is the name for the circled items in the following statement?

 

 modulus specifier

format specifier

flags specifier

precision specifier

 

 7. Which Java operator is used for concatenation?

&&

 +

 .

||

 

8. Given the following code fragment (presume there is a class called Car implemented):

Car mazdaCar = new Car();

Car subaruCar = new Car();

mazdaCar.setYear(2008);

mazdaCar.setColor(black);

subaruCar = mazdaCar;

subaruCar.setYear(2011);

mazdaCar.printYear();

 

What will display on the screen for mazdaCars year when mazdaCar executes printYear()?

a. 2008

b. 2010

c. 2011

d. Black

 

9. Given the following method from a class: public double calculateArea(double length, double width) { double area; area = length * width; return area; }

What is the scope of the variables length and width?

a. Global to the class.

b. Local to the method.

c. Global to all objects created from the class.

d. None of the above.

 

10. In the following code fragment:

 5 Person person1 = new Person();

6 Person person2 = new Person();

7 8 person1.setName(“Bugs Bunny”);

9 person2.setName(“Daffy Duck”);

10 System.out.println(person1.getName() + “, ” + person2.getName()); 11 12 person1.swapPerson(person2); 13 System.out.println(person1.getName() + “, ” + person2.getName()); 

What is being passed to the swapPerson method in line 12:

a. an object

b. an object reference

c. a class

d. a class reference

 

11. In the following Java code fragment:

 int postion1 = 15;

int postion2 = 18;

int distanceApart = Math.abs(position1 – position2);

What type of method is the Math.abs() method?

a. Instance method

b. Class method

c. Final method

d. Inherited method

 

12. When a public method needs to access both class members (variables and methods) and instance members (variables and methods), the method must be a / an _________ method.

a. instance

b. helper

c. class

d. None of the above.

 

13. In the following class:

public class Height { private double height; private String unitsOfMeasurement;

public Height() { this.unitsOfMeasurement = “in”; }

public void setHeight(double height) { this.height = height; this.unitsOfMeasurement = “cm”; }

public void setHeight(double height, String unitsOfMeasurement) { this.height = height; this.unitsOfMeasurement = unitsOfMeasurement; }

public void print() { System.out.println(this.height + ” ” + this.unitsOfMeasurement); } } // end class Height Which method is overloaded?

a. The print method

b. The Height method

c. The setHeight method

c. None of the methods are overloaded.

 

14. What must a method return if the method implements method call chaining?

The calling object

A class variable

The class

Null

 

15.

 

Which code segment is representative of a properly formatted nested loop?

a. while(i<5) {  }

b. while(j<3) {  } do { while(j<3) {  } }

c. while(i<5); do { while(j<3) {  } }

d. while(i<5) while(i<5) { while(j<3) {  }do; }

 

no answer matches

 

16. What is the fundamental difference between a do loop and a while loop?

a. Code inside a do loop will never be executed.

b. Code inside a while loop is guaranteed to execute at least once.

c. Code inside a do loop is guaranteed to execute at least once.

d. Do loops and while loops are the same.

 

17. What is the meaning of the java statement: import java.util.Scanner;?

a. It tells the java compiler to include the Scanner class from the utility package.

b. It tells the java compiler to exclude only the Scanner class from the compile process.

c. It signals the java compiler to scan the source code for errors.

d. None of the above.

 

18. Given the following code fragment: double interestRate = 0.05; double balance = 100.5; int interestInDollars = (int)(interestRate * balance); System.out.println(interestInDollars);

 

What value will display on the screen?

a.  5

b. 5.025

c. 5.03

d. 0

 

19. What is the significance of using the access modifier private with instance variables?

a.  It makes instance variables easier to access from outside the object.

b. Using private provides data encapsulation.

c. It makes the variables inaccessible from within the object.

d. The private access modifier should never be used.

 

20. Given the following code fragment:  System.out.println(“”Four score and seven years ago””””); 

What will display on the screen?

a. Four score and seven years ago  

b. Four score and seven years ago

c. Four score and seven years ago

d. “”””Four score and seven years ago””””

 

It will display:

“”Four score and seven years ago””

Match your answer accordingly

 

 

 

21. Given the following

 

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