Understanding Generics

What is the purpose of using generics in programming?

• To write reusable code that can work with different data types without sacrificing type safety.

• To increase the complexity of the code

• To improve performance by reducing code reusability

• To limit the flexibility of the program

Explain the concept of type parameter in generics.

• Type parameter in generics is optional and not necessary for defining classes

• Type parameter in generics is only used for primitive data types

• Type parameter in generics is a constant value that cannot be changed

• Type parameter in generics is a placeholder for a specific type that is used when creating instances of classes or invoking methods.

How do generics help in creating reusable code?

• Generics help in creating reusable code by allowing the definition of classes, interfaces, and methods that operate on parameters of a type that is specified when the code is used.

• Generics help in creating reusable code by increasing the complexity of the code.

• Generics help in creating reusable code by limiting the types that can be used in the code.

• Generics help in creating reusable code by reducing the flexibility of the code.

What is the difference between generics and non-generics in terms of type safety?

• Generics and non-generics both provide compile-time type safety.

• Generics provide compile-time type safety, while non-generics rely on casting and can lead to runtime errors.

• Generics provide runtime type safety, while non-generics rely on casting and can lead to compile-time errors.

• Non-generics provide compile-time type safety, while generics rely on casting and can lead to runtime errors.

Provide an example of a generic class in Java.

• class GenericClass { }

• class MyGenericClass { }

• class MyClass { }

• class MyClass { }

Discuss the advantages of using generics in a programming language.

• The advantages of using generics include code reusability, reduced code duplication, and improved code quality.

• Generics reduce code quality

• Generics make code less flexible

• Generics increase code duplication

How can generics improve code readability and maintainability?

• Generics limit the flexibility of code by restricting data types

• Generics increase the chances of errors in code

• Generics improve code readability and maintainability by enabling the creation of more abstract and flexible code that can work with different data types.

• Generics make code more confusing and harder to understand

Explain the concept of bounded type parameters in generics.

• Bounded type parameters have no impact on the types that can be used in generics.

• Bounded type parameters allow any type to be used as a type argument in generics.

• Bounded type parameters specify a lower bound for the types that can be used in generics.

• Bounded type parameters restrict the types that can be used as type arguments in generics by specifying an upper bound.

What are wildcards in generics and when are they used?

• Wildcards in generics are used to limit the number of possible types.

• Wildcards in generics are used when the specific type is not important or needs to be flexible.

• Wildcards in generics are used to enforce strict type checking.

• Wildcards in generics are used only for primitive types.

Discuss the limitations of generics in programming.

• Generics always lead to runtime errors

• Generics have no impact on code readability

• Generics are only applicable in certain programming languages

• Type erasure, lack of direct support for primitive types, issues with certain operations like instanceof checks