What are reserved words in Java?

Reserved words in Java, often referred to as keywords, are specific terms that the Java programming language uses for its syntax and structure. These words have a predefined meaning in the language and cannot be used for any other purpose, such as naming variables, classes, or methods.

For instance, terms like "class," "public," "static," and "void" are all reserved words that are fundamental to defining the structure of a Java program. Since these keywords are integral to the language's functionality, using them for anything other than their intended purpose would result in a syntax error.

In contrast, the other options do not correctly define reserved words. Terms that can be used interchangeably would imply that reserved words can be replaced or modified, which contradicts their purpose. Names defined by the programmer refer to identifiers that a developer creates, and variable names that are dynamic can change during program execution, which is also unrelated to the concept of reserved words. Thus, the definition of reserved words being words reserved for a special purpose is accurate and appropriately reflects their role in Java programming.