Java Data Types

Syntax

<data type> <variable name> = <value>;

Example

int num = 10;
double pi = 3.14;
char letter = 'a';

Output

num = 10
pi = 3.14
letter = 'a'

Explanation

Java has several built-in data types, each with its own range of values and memory requirements. These data types are categorized into two categories: primitive data types and reference data types.

Primitive data types include integers, floating-point numbers, characters, and boolean values. Reference data types include arrays, classes, and interfaces.

In the example above, we have declared three variables with their respective data types. The value of the variable is assigned using the equals sign (=).

Use

Java data types are used to define the type of data a variable can hold. They are used extensively in programming to define variables, create methods, and pass arguments between methods.

Important Points

• Java has several built-in data types.
• Primitive data types include integers, floating-point numbers, characters, and boolean values.
• Reference data types include arrays, classes, and interfaces.
• The value of a variable can be assigned using the equals sign (=).
• Data types are used to define the type of data a variable can hold.

Summary

Java data types are essential for creating variables and passing arguments between methods. They categorize data into two categories: primitive data types and reference data types. Primitive data types include integers, floating-point numbers, characters, and boolean values, while reference data types include arrays, classes, and interfaces. It is important to choose the right data type for your variables to ensure efficient memory usage and avoid runtime errors.