Question

Identify the incorrect statement regarding the use of generics and parameterized types in Java?

• A. Generics provide type safety by shifting more type checking responsibilities to the compiler
• B. Generics and parameterized types eliminate the need for down casts when using Java Collections
• C. When designing your own collections class (say, a linked list), generics and parameterized types allow you to achieve type safety with just a single class definition as opposed to defining multiple classes
• D. When designing your own collections class (say, a linked list), generics and parameterized types does not allow you to achieve type safety with just a single class definition as opposed to defining multiple classes

Hint:

Generics in Java allow defining type-safe collections and classes with a single implementation, avoiding redundant type-specific class definitions.

Answer 1

The Correct Option is D

Step 1: Understanding Generics in Java Generics provide compile-time type safety and eliminate the need for explicit type casting in Java Collections.
Step 2: Evaluating the Statements
- (A) Correct: Generics shift type-checking to the compiler, reducing runtime errors.
- (B) Correct: With generics, explicit downcasting is not required when retrieving elements from collections.
- (C) Correct: Generics allow defining a single class (e.g., `LinkedList` \(<T>\)) rather than multiple versions for different data types.
- (D) Incorrect: This statement contradicts the correct behavior of generics.