Java Final

Front 1

The purpose of a Java compiler is to:

Back 1

a. translate class file to source code

b. execute the java program

c. edit the source code

d. translate source code to a class file

Correct answer: d

Front 2

int x = 8 / 3 - 1; After this statement, x = ____

Back 2

Correct answer: 1

Front 3

Which of the following is the Java string concatenation operator?

Back 3

a. .strcat

b. ++

c. &

d. +

Correct answer: d

Front 4

Assuming the String variable world holds the value "FLORIDA",

Back 4

Value of word.substring(1, 3) : LO

Value of word.substring(word.length() - 4) : RIDA

Front 5

int a = 4, b = 3;

double d = (a + b) / 2

System.out.print( d );

What will be displayed?

Back 5

Correct answer: 3.0

Front 6

Write ONE Java statement to display your first and last name on two separate lines, and both in double quotes.

Example: "John"

"Smith"

Back 6

Correct answer:

System.out.print("\"John\"\n\"Smith\"");

Front 7

We want to display product names and their prices in a formatted way in a table. In each row of the table, we want to display product names and prices between pound signs (#). For instance, the string variable named product has value "ORANGE". Its price is in a double type variable named price. In each row, allocate 10 characters for product name, and allocate 8 characters for price, and display 2 digits only from the floating part. Make product names left aligned, and prices right aligned.

String name = "ORANGE";

double price = 12.34567

//Below, write ONE line of code only.

//Expected: #ORANGE # 12.34#

Back 7

Correct answer:

System.out.printf("#%-10s#%8.2f#", name, price);

Front 8

Write the missing part of the code below, so that for a given word, the program capitalize the first letter, and makes the rest of the letters lowercase. Example; if the name variable is abcDEF, the str becomes Abcdef. ABCD becomes Abcd. goNEN becomes Gonen.

String name = "goNEN";

String str;

// WRITE THIS PART ONLY

System.out.println(str);

Write your code (missing part only) below;

Back 8

String name = "goNEN";

String str;

str = name.substring(0, 1).toUpperCase() + name.substring(1).toLowerCase();

System.out.println(str);

Front 9

Write a Java statement to access the 7th character in the String variable myString and place it in the char variable c. Below is the method signature that you may use; char charAt(int position)

Back 9

Correct answer:

char c = myString.charAt(6);

Front 10

What is the output of this statement?

System.out.printf("#%2#", "HELLO");

Back 10

a. #HELLO#

b. #HE#

c. # HELLO#

d. Error

Correct answer:

a

Front 11

What is the output of this statement?

System.out.printf("%1.1f", 98.765);

Back 11

Correct answer:

98.8

Front 12

Suppose x = 15.674. The output of the statement System.out.printf("%.2f" , x); is 15.67.

TRUE OR FALSE

Back 12

Correct answer: TRUE

Front 13

The new line character is represented as "\n"

TRUE OR FALSE

Back 13

Correct answer: TRUE

Front 14

The Scanner class has a method next that allows an entire line of string text to be read.

TRUE OR FALSE

Back 14

Correct answer: FALSE

Front 15

Every Java program automatically imports the java.util package.

TRUE OR FALSE

Back 15

Correct answer: FALSE

Front 16

What Java package includes the class Scanner?

Back 16

a. lang

b. swing

c. io

d. util

Correct answer: util

Front 17

When writing an if statement, you MUST always use curly braces {} to enclose the body of the if.

TRUE OR FALSE

Back 17

Correct answer: FALSE

Front 18

When comparing a primitive value to see if it is greater than or equal to another primitive value, you may use either of the following two symbol combinations: >= or =>

TRUE OR FALSE

Back 18

Correct answer: False

Front 19

Not including the break statements within a switch statement results in a syntax error (compile-time).

TRUE OR FALSE

Back 19

Correct answer: False

Front 20

Any for loop can also be written as a while loop.

TRUE OR FALSE

Back 20

Correct answer: True

Front 21

The while loop performs its test before executing its statement.

TRUE OR FALSE

Back 21

Correct answer: TRUE

Front 22

Local variables are accessible outside the block in which they are defined.

TRUE OR FALSE

Back 22

Correct answer: FALSE

Front 23

Unlike a while loop, the body of a do...while loop executes at least once.

TRUE OR FALSE

Back 23

TRUE

Front 24

How many times does the following loop execute:

int[] numbers = {7, 3, 5, 6, 8};

for(int i : numbers) {System.out.println("Hi");}

Back 24

a. 0

b. 5

c. infinite

d. None (compile error)

Correct answer: b

Front 25

In Java, _______ is the AND operator.

Back 25

Correct answer: &&

Front 26

int k = 9;

String text = "";

if(0 < k && k < 10) {text = "one";}

else if(2 < k && k < 6) {text = "two";}

else if(3 < k && K < 5) {text = "three";}

if (k > 7) {text = "four";}

System.out.println(text);

What will be displayed?

Back 26

Correct answer: four

Front 27

The looping mechanism that always executes at least once is the ______ statement.

Back 27

a. if...else

b. do...while

c. while

d. for

Correct answer: b

Front 28

int d;

Random generator = new Random();

int d = generator.nextInt(6);

What is the range of d?

Back 28

a. [0, 1, 2, 3, 4, 5]

b. [0, 1, 2, 3, 4, 5, 6]

c. [-5, -4, -3, -3, -1, 0, 1, 2, 3, 4, 5]

d. [1, 2, 3, 4, 5]

Correct answer: a

Front 29

Write a for loop to display the numbers below.

50 45 40 35 30 25

Back 29

public class Forloop{

public static void main(String[] args){

for(int a = 50; a >= 25; a = a - 5){

System.out.print( a + " ")

}

}

}

Front 30

Write a complete Java class definition for class Employee. Each object of this class has the following; fullname: a String value representing the employee's full name. This must be private. Your class should also have:

A parameterized constructor: Initializes the fullname to the parameter passed.

getFullname method returns the fullname variable. writeOutput: this method displays employee's full name on the screen. In this method you must call getFullname method. Sample output; Employee Full Name: Bilal Gonen

Also write a EmployeeTester class to test your Employee class. In the main method, create an Employee object by using the parameterized constructor. Use your name as the parameter. Then, call the writeOutput method to display the name of employee in the format given above. After running EmployeeTester class, your program must output similar to below; Employee Full Name: Bilal Gonen

Back 30

public class EmployeeTester{

public static void main(String[] args){

Employee emp2 = new Employee("Joe Code");

emp2.writeOutput();

}

}

Write the Employee class below:

public class Employee

{

private String fullname;

public Employee(String aFullname){

fullname = aFullname;

}

public void writeOutput() {

System.out.println("Employee Full Name: + getFullname());

}

public String getFullname(){

return fullname;

}

}