Table of Contents
- 1 What are generics What problem do they solve?
- 2 Which feature is used for generic programming?
- 3 What is generic programming and how is it different to using inheritance and interfaces?
- 4 What is advantages and disadvantages of generics in Java?
- 5 What is generics in Java and how to use generics?
- 6 What is the generic version of a function called?
What are generics What problem do they solve?
In a nutshell, generics solves the problem of having to use loosely typed objects. For example, consider ArrayList vs List . It allows you to have a strongly typed collection.
Which feature is used for generic programming?
Explanation: Templates are used for generic programming. They help in making generic functions and classes hence achieving the generic codes.
What is the purpose of generic programming?
Generic Programming enables the programmer to write a general algorithm which will work with all data types. It eliminates the need to create different algorithms if the data type is an integer, string or a character.
Why generics are introduced in Java What problems do they overcome?
To overcome the above problems of collections(type-safety, type casting) generics introduced in java 1.5v . Main objectives of generics are: 1) To provide type safety to the collections. 2) To resolve type casting problems. To hold only string type of objects we can create a generic version of ArrayList as follows.
What is generic programming and how is it different to using inheritance and interfaces?
Inheritance is about making an abstract concept more and more concrete by adding details. Generic programming is essentially code generation. They serve different purpose. Generic programming (at least in C++) is about compile time polymorphisim, and virtual functions about run-time polymorphisim.
What is advantages and disadvantages of generics in Java?
Generics provide type-safety. So, we can hold a single type of object in generics. It provides a compile-time checker so it doesn’t show an error at runtime. There is no necessity to typecast an object.
What is generic programming in Java?
Generic programming refers to writing code that will work for many types of data. ArrayList is just one class, but the source code works for many different types. This is generic programming. The ArrayList class is just one of many standard classes that are used for generic programming in Java.
What are the advantages of generic programming languages?
Programs that use Generics has got many benefits over non-generic code. 1. Code Reuse: We can write a method/class/interface once and use it for any type we want. 2.
What is generics in Java and how to use generics?
Generics in Java is similar to templates in C++. For example, classes like HashSet, ArrayList, HashMap, etc use generics very well. There are some fundamental differences between the two approaches to generic types. Like C++, we use <> to specify parameter types in generic class creation.
What is the generic version of a function called?
The generic version of the function uses a placeholder type name (called T, in this case) instead of an actual type name (such as Int, String, or Double ). The placeholder type name doesn’t say anything about what T must be, but it does say that both a and b must be of the same type T, whatever T represents.
Can we write generic functions with different types of arguments?
We can also write generic functions that can be called with different types of arguments based on the type of arguments passed to the generic method, the compiler handles each method. When we declare an instance of a generic type, the type argument passed to the type parameter must be a reference type.