Java Data Types

In Java, there are two categories of data types:

1. Primitive data types: These are the basic data types that are predefined in Java and are not objects. There are 8 primitive data types in Java:

• boolean: Represents a boolean value, either true or false.
• char: Represents a single character, such as 'a', 'b', 'c', etc.
• byte: Represents an 8-bit integer value.
• short: Represents a 16-bit integer value.
• int: Represents a 32-bit integer value.
• long: Represents a 64-bit integer value.
• float: Represents a single-precision floating point value.
• double: Represents a double-precision floating point value.

1. Reference data types: These are objects that are created from classes, and they hold a reference to the object in memory. Some common reference data types in Java include:

• String: Represents a sequence of characters.
• Array: Represents a collection of elements of the same type.
• List: Represents an ordered collection of elements that can be modified dynamically.
• Set: Represents a collection of unique elements.
• Map: Represents a collection of key-value pairs.

It’s important to choose the appropriate data type for your variables, as this can affect the memory usage and performance of your program.

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