Web Reference: Primitive Data Types The Java programming language is statically-typed, which means that all variables must first be declared before they can be used. This involves stating the variable's type and name, as you've already seen: W3Schools offers free online tutorials, references and exercises in all the major languages of the web. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. Jan 16, 2026 · Non-primitive data types store references (memory addresses) rather than actual values. They are created by users and include types like String, Class, Object, Interface, and Array.
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