Today let’s see what the data types in Java are. Generally, we consider two types of data types: Primitive Data Types and Reference Data Types.
Since Java is a statically-typed language, variables must be declared before use. Declaring means you have to give the data type and name of the variable.
ex: int num ; Initializing the variable... Since the data type of the above variable is int ,the value it contains should be an int. ex: int num = 10 ; There are 8 Primitive Data Types in Java.
ex: String s = "string example";
String s1 = "ABC"; String s2 = "xyz"; s1 = s1 + "DE";