What Are the Data Types in the Java Programming Language?

Michael Morales  -  November 24, 2021  -  ,  

The Java programming language is one of the most popular and widely used programming languages globally. It’s used for everything from web applications to desktop apps, and it’s a great first language if you want to become a developer.

The Java language is rich in its data type selection. Different types allow you to select the appropriate one for any application's needs, depending on what information they are trying to store or process with that specific program code.

There are two categories of data types in the Java programming language. The first category is primitive types, including Boolean, Integer, Character, and Floating Point. The second category is reference types, including all other classes, interfaces, and arrays that are not primitives. Let’s take a look at each type.

Primitive Types

In Java, the primitive data types can be divided into four types. These types being, Integer, Character, Boolean, Floating point.

Both Integer and Floating points are used to store numbers. The former stores whole numbers between −(2n−1) to (2n−1)−1. While the latter represent fractional parts with accuracy to at least six decimal places making them more suitable for financial calculations.

The char variable stores a single character in the memory. It has an absolute minimum value of 'u0000' and a maximum which can go up to ‘uffff’ (or 65,535, inclusive). The boolean is a simple data type that only stores true or false values.

Reference Types

Reference types in the Java programming language include classes, interfaces, and type variables. Classes provide properties for objects to hold values or perform behaviors. An interface defines what others need to implement (or be able to use) them, a predicate that determines if something satisfies one of these contracts without knowing their implementation details, such as how many methods there are on offer with this particular solution design pattern.

Type Variables can store any kind of data but don't exist outside your program code – just another way we try to keep things DRY by making sure everything lives within its scope.

Whereas an array is a group of variables that share the same data type and may have one or more dimensions. Users can create arrays in any programming language, but they're most commonly used with objects to store multiple values at once, like weight measurements on an object's length.

To learn more about categories of Java data types, visit us on our blog page.

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