Java Tutorial - Java DataTypes w3Schools Ch#06 Urdu Hindi смотреть онлайн

Data types are divided into two groups:

Primitive data types - includes byte, short, int, long, float, double, boolean and char


Non-primitive data types - such as String, Arrays and Classes (you will learn more about these in a later chapter)


Primitive number types are divided into two groups:

Integer types stores whole numbers, positive or negative (such as 123 or -456), without decimals. Valid types are byte, short, int and long. Which type you should use, depends on the numeric value.

Floating point types represents numbers with a fractional part, containing one or more decimals. There are two types: float and double.

Non-primitive data types are called reference types because they refer to objects.

The main difference between primitive and non-primitive data types are:

Primitive types are predefined (already defined) in Java. Non-primitive types are created by the programmer and is not defined by Java (except for String).

Non-primitive types can be used to call methods to perform certain operations, while primitive types cannot.

A primitive type has always a value, while non-primitive types can be null.

A primitive type starts with a lowercase letter, while non-primitive types starts with an uppercase letter.

The size of a primitive type depends on the data type, while non-primitive types have all the same size.

Examples of non-primitive types are Strings, Arrays, Classes, Interface, etc. You will learn more about these in a later chapter.