Java Chapter 4 Quiz

If str1 and str2 are both String objects, which of the following expressions will correctly determine whether or not they are equal?

• str1 == str2

• str1 && str2

• str1.equals(str2)

• str1 + str2

In an if-else statement, if the boolean expression is false

• no statements or blocks are executed.

• the statement or block following the else is executed.

• the first statement or block is executed.

• all statements or blocks are executed.

What will be displayed when the following code is executed?

double x = 45678.259;

DecimalFormat formatter = new DecimalFormat("#,##0.0"); JOptionPane.showMessageDialog(null,formatter.format(x));

• 45,678.26

• 45,678.3

• 45,678.259

• 45678.259

________ operators are used to determine whether a specific relationship exists between two values.

• Assignment

• Arithmetic

• Logical

• Relational

The boolean expression in an if statement must evaluate to

• degrees or radians

• true or false

• positive or negative

• left or right

Which of the following expressions determines whether the char variable chrA is not equal to the letter 'A'?

• chrA == 'A'

• chrA != 'A'

• chrA || 'A'

• chrA.notEquals('A')

Enclosing a group of statements inside a set of braces creates

• an expression

• a block of statements

• a relational operator

• an if-else statement

A ________ is a boolean variable that signals when some condition exists in the program.

• sentinel

• flag

• block

• case

The ________ statement is used to create a decision structure, which allows a program to have more than one path of execution.

• block

• if

• null

• flag

When a character is stored in memory, it is actually the ________ that is stored.

• Unicode number

• ASCII code

• floating-point value

• letter, symbol, or number