Learn about the "Cannot instantiate the type" compilation error in Java.

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Java prevents direct instantiation of interfaces, abstract classes, and enums using the 'new' keyword, raising a 'Cannot instantiate the type' compilation error. Interfaces define contracts without implementations, abstract classes are intentionally incomplete, and enums have fixed compile-time instances with private constructors. Solutions include using concrete implementation classes for interfaces, creating subclasses for abstract classes, and referencing enum constants directly. Java 17+ sealed classes add further constraints by restricting which classes can extend or implement a type, and work well with pattern matching for exhaustive switch expressions.

Resolving the “Cannot instantiate the type” Compilation Error

5. Sealed Classes and Instantiation Constraints (Java 17+)