Java is statically typed. What this means is, the compiler knows the type of every variable. Once you declare a variable of a certain type, it cannot hold values of other types.
The advantage of statically typed language is that many bugs can be caught during compilation.
As a Java programmer, you must specify the type of each variable. All the variables, values, and their types are checked for correctness. The compiler checks if you assigned the wrong type of data to variables.
Here’s an example where a string value is assigned to an integer variable. Do you think it will compile?
public class Example {
public static void main(String[] arguments) {
int age = "19";
System.out.println(age);
}
}
The compiler generates an error if you try to compile this. Because age is
declared as a variable of type int. An int variable can store only integers.
But we tried to assign a string to an int variable.
In Java, there are two categories of data types. * Primitive Types * Reference Types
The primitive types are the most basic data types available. They are defined by Java.
The reference types are the data types that are defined by classes, interfaces, and enumerations.