(2-3)

Question 1

What will be displayed after the following statements have been executed?

Final double x;
x = 54.3;
System.out.println(“x = “ + x);

Answer 1

Nothing, it’s an error

Question 2

What is a result of the following expression?

10 + 5 * 3 - 20

Answer 2

5

Question 3

public class test {
public static void main(String args[] )
{
int value1 = 9;
System.out.println(value1);
int value2 = 45;
System.out.println(value2);
System.out.println(value3);
value = 16;
}
}

Answer 3

Nothing, it’s an error

Question 4

To compile a program named First, use the following command

Answer 4

javac First.java

Question 5

Which of the following is a valid Java statement?

Answer 5

String str = “John Doe.”;

Question 6

Which of the following is NOT a primitive data type?

Answer 6

String

Question 7

Given the declaration double r; which of the following statements is invalid?

Answer 7

r = 2.9X106;

Question 8

Which of the following is NOT a rule that must be followed when naming identifiers?

Answer 8

Identifiers can contain spaces

Question 9

To display the output on the next line, you can use the println method or use this escape sequence in the print method:

Answer 9

\n

Question 10

When saving a Java source file save it with an extension of:

Answer 10

.java

Question 11

This is a variable whose content is read only and cannot be changed during the program’s execution:

Answer 11

Named constant

Question 12

A variable’s scope is the part of the program that has access to the variable

Answer 12

True

Question 13

The boolean data type may contain values in the following range of values:

Answer 13

True or false

Question 14

A java program must have at least one of these:

Answer 14

Class definition

Question 15

In the following Java statement what value is stored in the variable name?

Str = “John Doe”;

Answer 15

The memory address where “John Doe” is located

Question 16

When the + operator is used with strings, it is known as:

Answer 16

String concatenation operator

Question 17

If x has been declared as an int, which of the following statements is invalid?

Answer 17

x = 1,000;

Question 18

In Java, it’s standard practice to capitalize the first letter of:

Answer 18

Class names

Question 19

Which Scanner class reads an int?

Answer 19

nextInt()

Question 20

If the compiler encounters a statement that uses a variable before the variable is declared an error will occur.

Answer 20

True

Question 21

Variables are classified according to their:

Answer 21

Data type

Question 22

This is a value that is written into the code of the program

Answer 22

Literal

Question 23

What is the result of the following code?

25 - 7 * 3 + 12 / 3

Answer 23

8

Question 24

In Java, the beginning of a comment is marked with:

Answer 24

//

Question 25

Which of the following is valid?

Answer 25

float w; w = 1.0f;

Question 26

Which of the following statements correctly creates a Scanner object for keyboard input?

Answer 26

Scanner keyboard = new Scanner(System.in);

Question 27

What will be displayed as a result of the following code: int x = 5, y = 20; x += 32; y /= 4; System.out.println("x = " + x + ", y = " + y);

Answer 27

x = 37, y = 5

Question 28

What will be the value of z as a result of executing the following code? int x = 5, y = 28; float z; z = (float) (y/x);

Answer 28

z = 5.0

Question 29

What would be printed out as a result of the following code? System.out.println("The quick brown fox" + "jumped over the \n" "slow moving hen.");

Answer 29

Nothing, it's an error

Question 30

What will be displayed as a result of the following code? int x = 6 string msg = "I am enjoying this class";

Answer 30

I am enjoying this class. I AM ENJOYING THIS CLASS i am enjoying this class Character at index x = n msg has 25 characters

Question 31

Character literals are enclosed in __________; string literals are enclosed in ____________

Answer 31

Single quotes, double quotes

Question 32

The primitive data types only allow a(n) ___________ to hold a single value

Answer 32

Variable

Question 33

What is the result of the following expression? 25 / 4 + 4 * 10 % 3

Answer 33

7

Question 34

In Java ______ must be declared before it can be used

Answer 34

Variables

Question 35

This is a named storage location in the computer's memory

Answer 35

Variable

Question 36

What will be displayed as a result of the following code? int x = 578; System.out.println("There are" + x + 5 + "\n" + "hens in the house.");

Answer 36

There are 5785 hens in the house

Question 37

What will be the value of z after the following statement executes? int x = 4, y = 33; double z; z = (double) (y/x);

Answer 37

8.0

Question 38

Assuming that pay has been declared a double, the following statement is valid: Pay = 2,888;

Answer 38

False

Question 39

What will be the value of ans after the following code has been executed? int x = 90, y = 55, ans = 10; if (x == y); ans *= 2;

Answer 39

20

Question 40

A block of code is enclosed in a set of:

Answer 40

braces { }

Question 41

Enclosing a group of statements in a set of braces creates a:

Answer 41

block of statements

Question 42

When two Strings are compared using the compareTo method, the cases of the two strings are not considered

Answer 42

False

Question 43

This type of operator determines whether a specific relationship exists between two values:

Answer 43

Relational

Question 44

A local variable's scope always ends at the closing brace of the block of code in which it is declared

Answer 44

True

Question 45

What will the value of ans after the following code has been executed? int ans = 10; int x = 65; int y = 55; if (x >= y) ans = x + y;

Answer 45

120

Question 46

What would be the value of bonus after the following statements are executed? int bonus, sales = 1250; if (sales > 1000) bonus = 100; if (sales > 750) bonus = 50; if (sales > 500) bonus = 25; else bonus = 0;

Answer 46

25

Question 47

If chr is a character variable, which of the following if statements are written correctly?

Answer 47

if (chr == 'a')

Question 48

The if/else statement will execute one group of statements if its boolean expression is true or another group if its boolean expression is false

Answer 48

True

Question 49

_______ works like this: If the expression on the left side of the && operator is false, the expression on the right side will not be checked

Answer 49

Short-circuit evaluation

Question 50

What is the value of ans after the following code has been executed? int x = 35; int y = 20, ans = 80; if (x > y); ans += y;

Answer 50

100

Question 51

This is a boolean variable that signals when some condition exists in the program

Answer 51

Flag

Question 52

If str1 and str2 are both strings, which of the following expressions will determine whether they are equal?

Answer 52

2 and 3 The statements that uses equals to and compareTo

Question 53

Which of the following is the not equal operator?

Answer 53

!=

Question 54

In most editors, you are indenting by one level each time you press this key:

Answer 54

tab

Question 55

A Boolean expression is one that is either:

Answer 55

true or false

Question 56

A flag may have the values

Answer 56

true or false

Question 57

What will the values of ans, x, and y after the following statements are executed? int ans = 0, x = 15, y = 25; if ( x >= y) { ans = x + 10; x -= y; } else { ans = y + 10; y += x; }

Answer 57

Ans = 35, x = 15, y = 40

Question 58

In an if/else statement, if the boolean expression is false:

Answer 58

The statement or block following the else is executed

Question 59

What will be the value of x after the following code is executed? int x = 75; int y = 60; if (x > y) x = x - y;

Answer 59

15

Question 60

What is the value of x after the following code has been executed? int x = 75; int y = 90; if (x != y) x += y;

Answer 60

165

Question 61

To do a case insensitive compare which of the following could be used to test the equality of two strings str1 and str2?

Answer 61

(str1.equalsIgnoreCase(str2)) and (str1.compareToIgnoreCase(str2) == 0)

Question 62

What would be the value of bonus after the following statements are executed? int bonus, sales = 85000; char dept = 'S'; if (sales > 100000) if (dept == 'R') bonus 2000; else bonus = 1500; if (sales > 75000) if (dept == 'R') bonus 1250; else bonus = 1000; else bonus = 0;

Answer 62

1000

Question 63

What will the values of ans, x, and y after the following statements are executed? int ans = 35, x = 50, y = 50; if ( x >= y) { ans = x + 10; x -= y; } else { ans = y + 10; y += x; }

Answer 63

ans = 60, x = 0, y = 50

Question 64

Which of the following is the correct boolean expression to test for: int x, being a value between, but not including, 500 and 650, or int y not equal to 1000?

Answer 64

((x > 500 && x < 650)) || (y != 1000))

Question 65

Which of the following tests the char variable chr to determine whether it is NOT equal to the character B?

Answer 65

if (chr != 'B')

Question 66

Programs never need more than one path of execution

Answer 66

False

Question 67

If you prematurely terminate an if statement with a semicolon, the compiler will

Answer 67

Not display and error message Assume you are placing a null statement Answer - All of these

Question 68

What would be the value of discountRate after the following statements are executed? double discountRate = 0.0; int purchase = 1250; if (purchase > 1000) discountRate = 0.05; if (purchase > 750) discountRate = 0.03; if (purchase > 500) discountRate = 0.01; else bonus = 0;

Answer 68

0.01 (check this answer again)

Question 69

The expression tested by an if statement must evaluate to:

Answer 69

true or false

Question 70

The ________ statement is used to make simple decisions in Java

Answer 70

if

Question 71

This operator uses two operands:

Answer 71

binary

Question 72

Because the && operator performs short-circuit evaluation, your boolean expression will usually execute faster if the subexpression that is most likely false is on the left side of the operand

Answer 72

True

Question 73

What would be the value of bonus after the following statements are executed? int bonus, sales = 10000; if (sales < 5000) bonus = 200; else if (sales < 7500) bonus 500; else if (sales < 10000) bonus = 750; else if (sales < 20000) bonus = 1000; else bonus = 1250;

Answer 73

1000

Question 74

What would be the value of discountRate after the following statements are executed? double discountRate = 0.0; int purchase = 100; if (purchase > 1000) discountRate = 0.05; else if (purchase > 750) discountRate = 0.03; else if (purchase > 500) discountRate = 0.01;

Answer 74

0.0

Question 75

What would be the value of discountRate after the following statements are executed? double discountRate = 0.0; int purchase = 1250; char cust = 'N'; if (purchase > 1000) if (char cust == 'Y') discountRate = 0.05; else discountRate = 0.04; if (purchase > 750) if (char cust == 'Y') discountRate = 0.04; else discountRate = 0.03; else discountRate = 0;

Answer 75

0.04 (check this answer again)

Question 76

If str1 and str2 are both strings which of the following will correctly test to determine whether str1 is less than str2?

Answer 76

3 = (str1.compareTo(str2) < 0)