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Java variables
Java variables are represented using variable names. Variable names can contain characters, numbersJava operators
Arithmetic Operators
| + | Addition operator when used on Numbers
Concatenation when used with Strings and char |
| - | Subtraction operator |
| * | Multiplication operator |
| / | Division operator |
| % | Remainder operator |
Relational Operators
| > | Greater than |
| >= | Greater than or equal to |
| < | Less than |
| <= | Less than or equal to |
| == | Equal to |
| != | Not equal to |
Conditional Operators
| && | Conditional AND operator |
| || | Conditional OR operator |
| ?: | Ternary operator (alternate to if-else statement) |
Unary Operators
| + | Unary plus operator. |
| - | Unary minus operator. Used to make a number or expression negative |
| ++ | Increment operator. Increments a value by 1 |
| -- | Decrement operator. Decrements a value by 1 |
| ! | Logical Not operator. Used on boolean values |
Assignment Operator
| = | assignment operator. used to assign values to variables |
Type Comparison Operator
| instanceof | Compares an object to a specified type |
Bit Operators
| ~ | Unary bitwise complement |
| << | Signed left shift |
| >> | Signed right shift |
| >>> | Unsigned right shift |
| & | Bitwise AND operator |
| ^ | Bitwise exclusive OR |
| | | Bitwise inclusive OR |
Java access modifiers
- private
- protected
- public
- default
Java Keywords
java keywords used with class methods
static, final, abstract, synchronized, throws
java keywords used with class definition
class, static, final, abstract, implements, extends
java keywords used on interfaces or in interface definition
interface, extends
All interfaces are inherently static, final and abstract and hence cannot be otherwise and there is no need to specify explicitly
java keywords used on variables
static, final, volatile,
byte, short, int, long, float, double, boolean, char
java keywords used for blocks
if, else, for, while, do, switch, case, default, try, catch, finally
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