JAva chap 1
Write a good variable name for the current value of a stock.
currentStockVal
What does the compiler do with code placed inside of comments?
disregards it
Example of Logical error
executes, but produce incorrect results, perhaps using an incorrect formula
How do you determine the number of connection lines for a point-to-point network?
n(n-1)/2
Using Java naming convention, write a name for a class about store customers.
public class Customers
Program
public class Jk { public static void main (String[] args) { System.out.println ("Hi"); } }
Write the code for (define) the main method for a Java program
public static void main(String [] args)
What does it mean when we say that Java is a case-sensitive language? Give an example
can only use caps in certain areas Strings not allowed
Example of a a run-time error
causes a program to terminate abnormally, such as trying to divide by zero
Wan
connects 2 or more lans 30 miles away
Man
connects 2 or more lans long distance
What cycle do computers continually follow?
Fetch decode execute
What is the first step in problem solving?
Understand the problem
How are the individual pixels (points) represented in a color image?
0 and 1
What is a binary number?
0 and 1 code for letters
1 bit can be used to represent how many distinct items or values? 2 bits? 3 bits?
1-2 2-4 3-8
What is a network?
2 or more computers connected together so they can exchange info
How do you convert from decimal to binary? Binary to decimal?
2^0 2^1........
Example of syntax error
Basic Errors Spelling- symbols
What is the purpose of comments in a computer program? Name two ways you can insert a comment into a program.
Comments are to explain the purpose of the program and describe what it does // */jsjdhdjhjs*/
List 3 legal and 3 illegal Java identifiers.
Hi_pie Qo$ hi toad BO 1.3 dy
what type of programming language is Java?
High level
How is all information stored in the computer?
In binary
List some of the characteristics of the Java programming language as discussed in your textbook.
It is an object-oriented language made up of classes methods and statements
Lan
Local area network- connects over a small distance
What does the statement System.out.println do in a program?
Prints a message
Is RAM or ROM volatile? What does it mean to be volatile?
RAM- Volatile Rom- Non Vol When the power goes out everything is lost.
What are the pixle values in a color image
RGB 0,0 is in the top left corner
What is RAM
Random Access Memory
What is ROM
Read only memory
Is a Java program best classified as software or hardware?
Software
name input device name output device
in- mouse out-moniter
what is the www
it is a application that runs on the internet
Which characters are allowed as identifiers?
letters, digits, the underscore character ( _ ), and the dollar sign Identifiers have to start with a letter
Why is the binary number system used to store information on a computer?
they are inexpensive and reliable
