Strong data typing:
Data can be created and manipulated in Java programs using variables (in which we can store and access data, as you saw in Unit 1)and expressions (for example, 2+ 3is an arithmetic expression). Java is a strongly typed language, which means that every variable and expression has a type when the program is compiled and that you cannot arbitrarily assign values of one type to another.
There are two categories of type in Java: primitive types and reference types.We can create primitive variables and reference variables. Primitive variables store data values. Reference variables do not themselves storedata values, but are usedtorefer to objects.
There are many kinds of primitive types and reference types. In fact, you can create your own reference types, as we shall see in the next unit, meaning that there is no limit to the number of these. There is fixed set of primitive types; these are detailed next.
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