Web Reference: Jan 16, 2026 · Java is a statically typed programming language, which means the data type of every variable is known at compile time. The compiler enforces type safety and prevents invalid assignments such as: int x = "GfG"; // Compile-time error Data types in Java define the kind of data a variable can hold and the memory required to store it. Note: This rule makes Java safer, because the compiler will stop you if you try to mix up types by mistake. If you really need to change between types, you must use type casting or conversion methods (for example, turning an int into a double). In addition to int, the Java programming language supports seven other primitive data types. A primitive type is predefined by the language and is named by a reserved keyword.
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