JAVA-Datatypes - Notes By ShariqSP

Data Types in Java

Data types in Java are used to specify the type of data that a variable can hold. They define the size and format of the data and determine the operations that can be performed on the data. Java supports two main categories of data types: primitive data types and reference data types.

Primitive Data Types

Primitive data types are the basic building blocks of data in Java. They represent simple values and are stored directly in memory. Java provides eight primitive data types:

• byte: 8-bit signed integer
• short: 16-bit signed integer
• int: 32-bit signed integer
• long: 64-bit signed integer
• float: 32-bit floating-point number
• double: 64-bit floating-point number
• char: 16-bit Unicode character
• boolean: Represents true or false values

Syntax and Examples

Syntax for Variable Declaration:

            dataType variableName;
                    

            int age;
            double height;
            boolean isStudent;
                    

            dataType variableName = value;
                    

            int count = 10;
            double pi = 3.14;
            boolean isActive = true;
                    

Reference Data Types

Reference data types are used to store references to objects. They do not hold the actual data but rather point to the memory location where the data is stored. Java provides various reference data types, including classes, interfaces, arrays, and enums.

Data Type Details