Java - Operators

OPERATORS

•         The Assignment Operator and Expressions

•         Arithmetic Operators

•         Operator Precedence

•         Integer Division and Modulus

•         Division by Zero

•         Mixed-Type Arithmetic and Type Casting

•         Shortcut Operators

Assignment Operator

Syntax:

target = expression;

expression: operators and operands that evaluate to a single value --value is then assigned to target

--target must be a variable (or constant) --value must be compatible with target's data type

Examples:

int numPlayers = 10; // numPlayers holds 10 numPlayers = 8; // numPlayers now holds 8 int legalAge = 18;

int voterAge = legalAge; The next statement is illegal

int height = weight * 2; // weight is not defined int weight = 20;

and generates the following compiler error: illegal forward reference

Arithmetic Operators

Operator Precedence

Shortcut Operators

++  increment by 1--     decrement by 1

Example:

 count++;    // count = count + 1;

count--;       // count = count - 1;

Postfix version (var++, var--): use value of var in expression, then increment or decrement. Prefix version (++var, --var): increment or decrement var, then use value in expression