there are mainly two type:-
- Primitive data type.
- Non primitive data types
| Data Type | Default value | Default size |
| boolean | False | 1 bit |
| char | ‘\u0000’ | 2 byte |
| byte | 0 | 1 byte |
| short | 0 | 2 byte |
| int | 0 | 4 byte |
| long | 0L | 8 byte |
| float | 0.0f | 4 byte |
| double | 0.0d | 8 byte |
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