Java - Chapters 6,7,8,9 - Multiple choice

Given the following code, what will be the value of finalAmount when it is displayed?

public class Order

{

   private int orderNum;

   private double orderAmount;

   private double orderDiscount;

   public Order(int orderNumber, double orderAmt,

               double orderDisc)

   {

      orderNum = orderNumber;

      orderAmount = orderAmt;

      orderDiscount = orderDisc;

   }

   public double finalOrderTotal()

   {

      return orderAmount - orderAmount *

             orderDiscount;

   }

}

public class CustomerOrder

{

   public static void main(String[] args)

   {

      Order order;

      int orderNumber = 1234;

      double orderAmt = 580.00;

      double orderDisc = .1;

      order = new Order(orderNumber, orderAmt, orderDisc);

      double finalAmount = order.finalOrderTotal();

      System.out.printf("Final order amount = $%,.2f\n",

                        finalAmount);

   }

}

Which of the following statements will create a reference, str, to the string, "Hello, world"?

(1)    String str = new String("Hello, world");

(2)    String str = "Hello, world";

In UML diagrams, this symbol indicates that a member is public.

This refers to the combining of data and code into a single object.

A class specifies the ________ and ________ that a particular type of object has.

Which of the following statements will create a reference, str, to the String, "Hello, World"?

What does the following UML diagram entry mean?

When you are working with a ________, you are using a storage location that holds a piece of data.

Class objects normally have ________ that perform useful operations on their data, but primitive variables do not.

The following statement creates an ArrayList object. What is the purpose of the <String> notation?

ArrayList<String> arr = new ArrayList<String>();

You can use this ArrayList class method to replace an item at a specific location in an ArrayList.

If numbers is a two-dimensional int array that has been initialized and total is an int that has been set to 0, which of the following will sum all the elements in the array?

Which of the following for loops is valid, given the following declaration?

String[] names = {"abc", "def", "ghi", "jkl"};

What would be the results of the following code?

final int SIZE = 25;

int[] array1 = new int[SIZE];

… // Code that will put values in array1

int value = 0;

for (int a = 0; a < array1.length; a++)

{

   value += array1[a];

}

What would be the results of the following code?

final int SIZE = 25;

int[] array1 = new int[SIZE];

… // Code that will put values in array1

int value = 0;

for (int a = 0; a <= array1.length; a++)

{

   value += array1[a];

}

What will be the value of x[1] after the following code is executed?

int[] x = {22, 33, 44};

arrayProcess(x[1]);

...

public static void arrayProcess(int a)

{

   a = a + 5;

}

What would be the results after the following code was executed?

int[] x = {23, 55, 83, 19};

int[] y = {36, 78, 12, 24};

x = y;

y = x;

What will be the value of x[8] after the following code has been executed?

final int SUB = 12;

int[] x = new int[SUB];

int y = 20;

for(int i = 0; i < SUB; i++)

{

   x[i] = y;

   y += 5;

}

What is the value of scores[2][3] in the following array? 

int [] [] scores = { {88, 80, 79, 92}, {75, 84, 93, 80},

     {98, 95, 92, 94}, {91, 84, 88, 96} };

What would be the results of the following code? 

int[] array1 = new int[25];

… // Code that will put values in array1

int value = array1[0];

for (int a = 1; a < array1.length; a++)

{

   if (array1[a] < value)

     value = array1[a];

}

What will be the value of x[1] after the following code is executed? 

int[] x = {22, 33, 44};

arrayProcess(x);

…

public static void arrayProcess(int[] a)

{

   for(int k = 0; k < 3; k++)

   {

      a[k] = a[k] + 5;

   }

}

What would be the results of the following code?

int[] x = { 55, 33, 88, 22, 99,

            11, 44, 66, 77 };

int a = 10;

if(x[2] > x[5])

   a = 5;

else

   a = 8;

What will be the results of the following code?

final int ARRAY_SIZE = 5;

double[] x = new double[ARRAY_SIZE];

for(int i = 1; i <= ARRAY_SIZE; i++)

{

   x[i] = 10.0;

}

What will be the value of x[8] after the following code has been executed?

final int SUB = 12;

int[] x = new int[SUB];

int y = 100;

for(int i = 0; i < SUB; i++)

{

   x[i] = y;

   y += 10;

}

Assume the class BankAccount has been created, and the following statement correctly creates an instance of the class:

 BankAccount account = new BankAccount(5000.0);

 What is TRUE about the following statement?

 System.out.println(account);

Assuming the following declaration exists:

 enum Tree { OAK, MAPLE, PINE }

 What will the following code display?

 System.out.println(Tree.OAK);

Look at the following declaration:

enum Tree { OAK, MAPLE, PINE }

What is the fully-qualified name of the PINE enum constant?

Look at the following declaration:

enum Tree { OAK, MAPLE, PINE }

What is the ordinal value of the MAPLE enum constant?

When the this variable is used to call a constructor:

If the following is from the method section of a UML diagram, which of the following statements is TRUE?

+ add(object2:Stock): Stock

What will be returned from a method, if the following is the method header?

public Rectangle getRectangle()

Which of the following is NOT true about static methods?

If object1 and object2 are objects of the same class, to make object2 a copy of object1:

If the following is from the method section of a UML diagram, which of the following statements is TRUE?

+ equals(object2:Stock) : boolean

Java automatically stores this value in all uninitialized static member variables:

Static methods can only operate on ________ fields.

Look at the following code.

Integer myNumber;

myNumber = 5; 

Which of the following is TRUE about the second statement?

To convert the string, str = "285" to an int, use the following statement:

For the following code, how many times would the for loop execute?

String str = ("Ben and Jerry's ice cream is great.");

String[] tokens = str.split(" ");

for (String s : tokens)

   System.out.println(s);

What will be the tokens given the following statements?

 String str = ("January 1, 2016");

String[] tokens = str.split(" ");

What would be the results of executing the following code?

StringBuilder str = new StringBuilder(12);

str.append("The cow");

str.append(" jumped over the ");

str.append("moon.");

What will be the value of matches after the following code has been executed?

boolean matches;

String str1 = "The cow jumped over the moon.";

String str2 = "moon";

matches = str1.endsWith(str2);

Use the following import statement when using the Character wrapper class:

To convert the int variable, number to a string, use the following statement:

To convert the string, str = "285.74" to a double, use the following statement:

Each of the numeric wrapper classes has a static ________ method that converts a number to a string.