Variables
- Can start with dollar symbol or underscore
- Cannot start with a number
- Cannot be a reserved word
- No limit on the length of the name
<datatype> <variable name>;
int number = 1;
// array
<dataytpe> [] arrayname = new <datatype> [<number of elements>];
int [] list = new int[10];
// multi-dimensional arrays
int matrix [] [] = new int[4] [5];
// array
<dataytpe> [] arrayname = new <datatype> [<number of elements>];
int [] list = new int[10];
// multi-dimensional arrays
int matrix [] [] = new int[4] [5];
Method Names
- Verbs or verb phrases
- first letter of the method name is lowercase
- first letter of subsequent words is capitalized
- Cannot be reserved word
- Example: calculateMonthlyPayments
Class and Interface Names
- Begins with capital letter
- First letter of each word in the name is capitalized
Constant Names
- Use all caps
Example: Color.BLUE
Escape sequences
- \n New line
- \t Horizontal tab
- \b Backspace
- \r Carriage return
- \f Form feed
- \\ Backlash
- \" Double quote
- \ddd Octal character
- \xdd Hexadecimal
- \udddd Unicode characters
Operators
- <
- <=
- == ( for primitives compares values; for reference types compares object identity; for reference types, by convention, equals() method is implemented to compare values contained in the object for determining equality; String class even has equalsIgnoreCase)
- !=
- >=
- >
- &&
- ||
- !
