java chap 2

keywords

boolean if interface class true char else package volatile false byte final switch while throws float private case return native void protected break throw implements short public default try import double static for catch synchronized int new continue finally const long this do transient goto abstract super extends instanceof null

System.out.println(userAge + " \nis " + userName + "'s age.");

22 is Tom's age.

How many times will the while loop that follows be executed if months has a value of 5? int i = 1; while (i < months) { futureValue = futureValue * (1 + monthlyInterestRate); i = i+1;

4

Which of the following is a valid class name? Customer-Maintenance 2004YearEndApp CustomerMaintApp Numeric#Validator

CustomerMaintApp

According to standard naming conventions, which of the following is a typical class name? $Calculate calculateTotal Product product

Product

rules for naming indentifier

Start each identifier with a letter, underscore, or dollar sign. Use letters, dollar signs, underscores, or digits for subsequent characters. • Use up to 255 characters. • Don't use Java keywords.

recommendations for naming class

Start every word within a class name with an initial cap. • Each class name should be a noun or a noun that's preceded by one or more adjectives.

rules for naming class

Start the name with a capital letter. • Use letters and digits only. • Follow the other rules for naming an identifier

You can use relational operators to

compare numeric variables

You typically use comments in a Java application to

describe code that is difficult to understand

Which of the following is a valid statement for declaring and initializing a double variable named length to a starting value of 120?

double length = 120.0;

Based on the naming recommendations in the book, which of the following is a good identifier for a variable that will be used to hold an employee's phone number? employee_phone_number emphonumber employeePhoneNumber EmployeePhoneNumber

employeePhoneNumber

The double data type can be used to store

floating point numbers

Which package is automatically available to all Java programs?

java.lang

What does testing an application entail?

running it to see if it works correctly

Which of the following is a valid variable name? salesTax input-string 25Percent double

salesTax

If a class contains a main() method, that method is executed

when the class is run

The int data type can be used to store

whole numbers only

Block scope means that a variable

xsewd???can't be used outside of the statement that it's declared in