Data Types in Java | Primitive & Non Primitive Data Types | Object Oriented Programming | Examples
Channel: PsychoTech Institute™
Date: 15/11/2023

In Java, data types are used to classify and specify the type of data that a variable can hold. Java supports a variety of data types, which can be categorized into two main groups: primitive data types and reference data types. Here's an overview of the commonly used data types in Java:

Primitive Data Types:

1. **byte:** Represents 8-bit signed integers. Range: -128 to 127.
2. **short:** Represents 16-bit signed integers. Range: -32,768 to 32,767.
3. **int:** Represents 32-bit signed integers. Range: -2^31 to 2^31-1.
4. **long:** Represents 64-bit signed integers. Range: -2^63 to 2^63-1.
5. **float:** Represents single-precision 32-bit floating-point numbers.
6. **double:** Represents double-precision 64-bit floating-point numbers.
7. **char:** Represents a single 16-bit Unicode character.
8. **boolean:** Represents a boolean value (true or false).

Reference Data Types:

1. **Class Types:** These are user-defined classes created by the programmer.
2. **Array Types:** Arrays can hold elements of the same data type.
3. **Interface Types:** Interfaces define a contract for classes to implement.
4. **Enumeration Types:** Enums represent a set of named constants.

Wrapper Classes:

Java also provides a set of wrapper classes for primitive data types, which allow you to use them as objects:

1. **Byte:** Wrapper class for byte.
2. **Short:** Wrapper class for short.
3. **Integer:** Wrapper class for int.
4. **Long:** Wrapper class for long.
5. **Float:** Wrapper class for float.
6. **Double:** Wrapper class for double.
7. **Character:** Wrapper class for char.
8. **Boolean:** Wrapper class for boolean.

String:

While `String` is often treated as a reference type, it is a special class in Java and used to represent sequences of characters.

These data types are used to declare variables, method parameters, and return types in Java. Understanding the different data types is crucial for efficient memory usage and for ensuring the correctness of your programs when working with various kinds of data.


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