Basic JAVA 2
Data Types in Java
Java language has a rich implementation of data types. Data types specify size and the type of values that can be stored in an identifier
In java, data types are classified into two catagories:
1) Primitive Data type
2) Non-Primitive Data type
1) Primitive Data type :
A primitive data type can be of eight types :
char boolean byte short int long float double
A primitive data type can be of eight types :
Once a primitive data type has been declared its type can never change, although in most cases its value can change. These eight primitive type can be put into four groups:
| 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 |
2) Primitive Data type :
A reference data type is used to refer to an object. A reference variable is declare to be of specific and that type can never be change. We will talk a lot more about reference data type later in Classes and Object lesson.For example, Employee, Puppy etc:
Class objects, and various type of array variables come under reference data type. Default value of any reference variable is null.
Example: Animal animal = new Animal("tiger");
