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in programing

QuestionAnswer
Test Plans should test ever condition possible. valid or invalid.
Every object created with new has Its own copy of the attributes stored in memory
char size 2 bytes or 16 bits
int size 4 bytes or 32 bits
how to compile JavaMain.java javac JavaMain.java
A java file need to have what to compile public static void main(String[] argv) { }
A programmer requires knowledge of the language also called syntax
double size 8 bytes or 64bits
float size 4 bytes or 32 bits(same as int)
long size 8 bytes or 64bits(same as double)
to define a number as a float you need to (float)9.9 or 9.9f
strings and char require single or double qoutes 'A' "A"
short 2 bytes or 16 bits(same as char)
variables can have what but can't start with it a number
what indicates input from a device in Java System.in
importing Scanner syntax import java.util.Scanner;
creating scanner syntax Scanner input = new Scanner(System.in);
getting data from user syntax x=input.next();
Escape Sequence for newlin \n
Escape Sequence for tab \t
Escape Sequence for Ring Bell \r
Escape Sequence for print special character \\ \" \'
Syntax error error that stops the program from comiling
Logic error program runs but returns strange results
Run-time error program stops because of not possible answers such as divide by zero
Given declaration Name name1; a call to displayName method would be name1.displayName();
Members declared as private can be accessed buy the class they are created in
when is memory for a class allocated when a reference to the object name is declared
Every Java application has at least one public class
Method headers must contain name, return type, parentheses ()
how to round 99.95 with print statement System.out.printf("%1.1f", 99.95);
printf statements for floats and doubles %f %e
printf for int %d
printf for char %c
%e does what prints scientific notation e+00
Methods are code that performs actions and returns data
Method Modifier public, private static
Method return types void, Boolean, int, double...
Can you increase String size automatically Yes because all strings are reference variables
String sName.CompareTo("Thing") will return a 0 if true and a 1 if false
String name = "Bob Jone"; char letter =name.charAt(2); returns b
When is memory for an object alocated when the object is instantiated Ex: Class objectname = new Class();
default constructors take how many variables none
Three ways to assign values to Strings name="thing"'; name = new String("thing"); name=input.nextLine();
Created by: stic