Why generics are used in java

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Careers Hiring. For Bootcamps. Enabling programmers to implement generic algorithms. By using generics, programmers can implement generic algorithms that work on collections of different types, can be customized, and are type safe and easier to read. Compile time check that verifies your application that it will not do any undefined behaviour - like in above example. Your Deserialize method is not impossible in Java. You just have to explicitly pass the Class object because it cannot be determined at runtime from the type parameter T.

It can be called using deserialize AnyClass. Here list can contain any object , it can be String,Integer or double, Employee etc which can cause type safety problem and stops runtime errors at compile time.

Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Is there any reason to use generics in Java? Ask Question. Asked 6 years, 10 months ago. Active 1 year, 10 months ago. Viewed 4k times. In C I've got a method which takes a string and deserializes it into an object I can't help but feel I'm missing something Basic Basic Add a comment. Active Oldest Votes.

Well, if you don't use generics, you get to cast each time. Interesting point re: bounds, but it means you're always aiming for the lowest common denominator. What if you wanted to be able to Compare and Count? Comparable works because it's widely-used by every class out there that's comparable. If you want to have 2 such methods, you'd need your classes to inherit from MyComparableCountable which limits you to classes you've implemented This check is, again, at compile time, and the compiler will emit the appropriate code so that you don't get a ClassCastException.

Count was probably a bad example. I was trying to pick another method that might exist on multiple classes but not all. What is the garbage collector in Java? What is numeric promotion? What does it mean to be static in Java? What are final variables in Java? How Do Annotations Work in Java? How do I use the ternary operator in Java? What is instanceof keyword in Java?

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