Java Test-2

Which of the following is the best description of a "relational operator"?

• Comparison symbols used in logical expressions

• Mathematical symbols used to calculate numeric results

• Links that control the relationships between objects

• None of these are true

Given two numbers A and B, which of the following expressions will be true when "A is less than B"?

• A < B

• A > B

• A == B

• A != B

Given two numbers A and B, which of the following expressions will be true when "A is equal to B"?

• A != B

• A == B

• A = B

• A.eq(B)

Given the following code, what will be displayed when the program is run?

int A = 5; int B = 10;

System.out.print(A != B);

System.out.print(" ");

System.out.print(A < B);

• true false

• false false

• true true

• false true

Which of the following expressions (A, B, C) is considered a logical expression?

A) 6 + 4

B) (6 + 4) >= 10

C) 4 < 10

• A only

• B and C only

• A, B, and C

• C only

What happens if you do not follow an if() statement with opening and closing curly braces?

• All following statements that are indented to the right are part of the if() body

• This is a compile-time syntax error

• You must follow immediately with another if() statement

• The next statement only is part of the if() body

What is the difference between the following three if() statements?

double sodaCost = 2.50;

if (sodaCost > 2.00)

System.out.println("I'll have water instead");

if (sodaCost > 2.00)

System.out.println("I'll have water instead");

if (sodaCost > 2.00)

System.out.println("I'll have water instead");

• Only the second one is valid; the other two produce compile-time errors

• Impossible to tell without running the program

• The second two if() statements are nested inside the first and will only run if the first is true

• All three work exactly the same way and produce the same output

Given the following boolean value, how would you write an if() statement that will execute if that value is true?

boolean run_me = true;

• All of these will work

• if (run_me)

• if (run_me == true)

• if (run_me != false)

Given the following code, which of these if() statements will produce a compile-time error?

int value = 12;

• All of these are compile-time errors

• if (value = 13)

• if (value + 1)

• if (value += 5)

What will be displayed when the following statements are run?

String pet = "cat";

if (pet.equals("dog")) {

System.out.println("WOOF"); }

if (pet.equals("dog") == false) {

System.out.println("MEOW"); }

• MEOW

• WOOF

• WOOF MEOW

• MEOW WOOF