Understanding generics

How to understand Java Generics?

• A. Implementing runtime type checks.
• B. Defining unrelated methods and classes.
• C. Enabling compile-time type safety.
• D. Overriding default Java methods.

What it means by generics in Java?

• A. Involves unrelated methods/types.
• B. Includes only primitive data types.
• C. Involves related methods/types.
• D. Supports only Integer and String.

Why generics are safe in Java?

• A. Allow runtime errors for flexibility.
• B. Improve code readability.
• C. Ensure type safety and code reusability.
• D. Increase runtime error occurrence.

What is wildcard in Java generic?

• A. A character used in comments.
• B. A symbol representing known types.
• C. A symbol representing unknown types.
• D. A special class for type conversion.

What is the main aim of generics in Java?

• A. Enabling runtime casting.
• B. Avoiding generic algorithms.
• C. Eliminating code reusability.
• D. Ensuring stronger type-checking.

How generics works internally in Java?

• A. Focus on runtime type errors.
• B. Prevent ClassCastException at runtime.
• C. Provide dynamic type resolution.
• D. Optimize code execution.

What is generics and types?

• A. Specific to single data type.
• B. Applied only to classes.
• C. Parameterized classes/interfaces.
• D. Suitable for primitive types.

How to create generic list in Java?

• A. Use ArrayList<GenericType>.
• B. Declare List<Generic> with HashMap.
• C. Create List<Generic> with a map.
• D. Define List<Generic> using Set.

What are advantages of generics?

• A. Increased need for casting.
• B. Offer type safety and code reuse.
• C. Decreased performance.
• D. Exclusive use of primitive types.

What are the benefits of generics?

• A. Introduce boxing/unboxing issues.
• B. Ensure type safety and flexibility.
• C. Support arbitrary data types.
• D. Encourage runtime type checks.