DATA TYPES & VARIABLES

Data Type specifies the format, range of values and memory requirement of data that a data element can hold.

Hierarchy of Data Types in Java:

1. Primitive
   1. Integral

1. Numeric
   1. Integer
      1. Byte
      2. Short
      3. Int
      4. long
   2. Decimal
      1. Float
      2. double
   3. Character

1. 1. Boolean
2. Non-Primitive
   1. Class
   2. Array

Range of Signed Values for any Data Type based on its Memory Requirement:

Minimum Value: -2^(n-1)

Maximum Value: +2^(n-1) – 1

Range of Unsigned Values for any Data Type based on its Memory Requirement:

Minimum Value: 0

Maximum Value: +2^(n-1)

Java Primitive Data types

In most of the languages, the format and size of primitive data types depend on the platform on which a code is running. But in Java programming language, size and format of its primitive data types is specified.

Integer & Floating-point numbers fall under Numeric datatypes.  Java has six numeric datatypes that differ in size and precision of the numbers they can hold.  The Size means how many bits are needed to represent the data type.  The Range of a data type expresses the precision of numbers.

Four categories of Integer data types

Float Data types

Character Data type

Boolean data type