Fundamentals of Computer Science Exam 2

The ________ operator computes the remainder of division.

%

Comments

-Ignore everything from a // delimiter to the end of the line -Longer comments go in /* */

Names

-Must start with a letter or the underscore (_) character -Remaining characters must be letters, numbers, or underscores. -Cannot use other symbols such as ? or % or a space -Use camelCase -Case sensitive -Cannot use reserved words such as double or class -Variables start with lowercase, classes start with uppercase

Instance variables

-Stores the data of an object -A storage location present in each of the class

Assignments

-Use (=) to change the value of the variable

String positions are counted beginning with a ________.

0

The software development process

1. Understand the problem 2. Develop and describe an algorithm 3. Test the algorithm with different inputs 4. Translate the algorithm into Java 5. Compile and test your program

The binary equivalent of 117 is ________.(Make sure you include leading zeroes)

1110101

The value of x after these statements have executed is ________. int x = 3; x--; x++; x--;

2

After evaluating the following, the result would be ________. int x = 3; Math.sqrt(Math.pow(x,2));

3

The decimal equivalent of 00100110 is ________.

38

Algorithm

A sequence of steps that is unambiguous, executable, and terminating

Classes

A set of objects with the same behavior

Exception

A type of run time error that generates an error message from the Java virtual machine

a]variables are initialized to a default value, but you must initialize [b] variables.

A. Instance B. Local

The word "private" is a/n ________________ specifier.

Access

Object

An entity in your program that you can manipulate by calling one or more of its methods

The primitive type that has only two possible values is __________.

Boolean

You use a ________ to convert a value to a different type.

Cast

The constructor name is always the same name as the ______________.

Class

The java compiler translates source code into __________ files that contain instructions for the Java virtual machine.

Class

The fundamental building block of Java programs.

Classes

Use documentation ___________________ to describe the classes and public methods of your programs.

Comments

Used to help human readers understand your programs.

Comments

A ___________ error is a violation of the programming language rules that is detected by the compiler.

Compile-time

Method

Consists of a sequence of instructions that can access the data of an object

________________ set the initial data for objects.

Constructors

Secondary storage

Data storage that persists without electricity

Java has _________ primitive types.

Eight

The process of hiding implementation details while publishing an interface is called ____________.

Encapsulation

Data processing

Fetches data from external memory or devices, store data

To tell Java that a variable is a constant use the keyword ________.

Final

Information ________ makes it simpler for the implementor of a class to locate errors and change implementations.

Hiding

Use of an instance variable name in a method denotes the instance variable of the ___________ parameter.

Implicit

An object is a ______________________ of a class.

Instance

Each object of a class has its own set of ____________________ variables.

Instance

If both arguments of the / operator are integers, the result is a/n ________.

Integer

___________ variables are declared in the body of a method.

Local

Program control

Locates and executes program instructions; Carries out arithmetic operations

A run-time error is also called a _________ error.

Logic

Every java application contains a class with a __________ method.

Main

To find the square root of a number, use the ________ class. (capitalize if appropriate)

Math.sqrt()

The word "value" is the ________________ of the variable.

Name

What does CPU (Central processing unit) do?

Performs program control and data processing

Types of storage

Primary and secondary storage

A computer _________ executes a sequence of very basic instruction in rapid succession.

Program

A numeric computation overflows if the result falls outside the ________ for the numeric type.

Range

When a method exits, its local variables are ________________.

Removed

________ errors occur when an exact conversion between numbers is not possible.

Rounding

A _______ error causes a program to take an action that the programmer did not intend.

Run-time

What are the two most important benefits of the Java language?

Safety and portability

A ________ method does not operate on an object.

Static

Primary storage

Storage that needs to be supplied with power

Variable

Stores a value that you want to use later

A sequence of characters enclosed in quotation marks.

String

Peripherals

To interact with human users (e.g., display screen, speakers, printers, a keyboard, a mouse)

The word "int" is the ________________ of the variable.

Type

The escape sequence which mover your print to another line is ________.

\n

Types include...

int, double, string

Write the shorthand way to increment the variable x by 1.

x++