What are the 8 primitive data types in the Java language?
There are 8 primitive types,
The Double Variable. The double variable can hold very large (or small) numbers. The double variable is also used to hold floating point values. A floating point value is one like 8.7, 12.5, 10.1. In other words, it has a "point something" at the end.
- Short answer: int uses up 4 bytes of memory (and it CANNOT contain a decimal), double uses 8 bytes of memory. Just different tools for different purposes. int is a binary representation of a whole number, double is a double-precision floating point number.
- static means that the method is associated with the class, not a specific instance (object) of that class. This means that you can call a static method without creating an object of the class. void means that the method has no return value. If the method returned an int you would write int instead of void .
- A package is a namespace that organizes a set of related classes and interfaces. Conceptually you can think of packages as being similar to different folders on your computer. You might keep HTML pages in one folder, images in another, and scripts or applications in yet another.
The eight primitive data types in Java are:
- boolean, the type whose values are either true or false.
- char, the character type whose values are 16-bit Unicode characters.
- the arithmetic types: the integral types: byte. short. int. long. the floating-point types: float. double.
- Primitive Versus Non-Primitive
- The primitive data types include byte, int, long, short, float, double, and char.
- Non-primitive, or reference data types, are the more sophisticated members of the data type family.
- Reference types can be a class, interface, or array variable.
- Well, all casting really means is taking an Object of one particular type and “turning it into” another Object type. This process is called casting a variable. This topic is not specific to Java, as many other programming languages support casting of their variable types.
- An array is a container object that holds a fixed number of values of a single type. The length of an array is established when the array is created. After creation, its length is fixed. You have seen an example of arrays already, in the main method of the "Hello World!" application.
Data types in Java are classified into two types:
- Primitive—which include Integer, Character, Boolean, and Floating Point.
- Non-primitive—which include Classes, Interfaces, and Arrays.
- Autoboxing is the automatic conversion that the Java compiler makes between the primitive types and their corresponding object wrapper classes. For example, converting an int to an Integer, a double to a Double, and so on. If the conversion goes the other way, this is called unboxing.
- Assigning a value of one type to a variable of another type is known as Type Casting. Example : In Java, type casting is classified into two types, Widening Casting(Implicit)
- A reference type is a data type that's based on a class rather than on one of the primitive types that are built in to the Java language. Either way, when you create an object from a class, Java allocates the amount of memory the object requires to store the object.
Updated: 18th September 2018