Parameterized interface

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Remember generics? They are generalizations - parametrized types, right? If not, rack your brain, then search through the lessons, and then search Google. Or use a different order if you'd like. Then, look at this task's code and make the StringObject class implement the SimpleObject interface using a String parameter.

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Aman

Level 20 , Ajmer, India

4 June 2019, 12:46

I did not understand this. What is parameterized interface and what does it do?

Liliane Top

Level 17 , Amsterdam, Netherlands

7 March 2020, 19:51

I also do not understand the question or what we are suppose to do... Very unclear!

Alex Vypirailenko Java Developer at Toshiba Global Comme

8 March 2020, 10:06

Look at the SimpleObject interface syntax. The means a generic parameter, which means that when you implement this interface, you can add a parameter of your choosing instead of T. In the case with this case, we are asking you to use String as a parameter.

Liliane Top

Level 17 , Amsterdam, Netherlands

8 March 2020, 10:51

Hi Alex, I got the solution but got stuck with the return value. I now understand that I could either use return null; or return this; And not return String; As there is no String object declared nor initialised. I got this from another learner. Sometimes the help section works very good in helping me understand.

Lucas Hoage

Level 14 , Savannah, United States

10 June 2020, 02:43

In what practical situation is this used? I understand what it is asking me to pass through when implementing the intrface, I just don't understand when or why we would use this.

Alex Vypirailenko Java Developer at Toshiba Global Comme

11 June 2020, 06:08

These articles should help understand Generics a bit better: https://codegym.cc/groups/posts/214-what-are-generics-in-java https://codegym.cc/groups/posts/generics-in-java https://codegym.cc/groups/posts/292-wildcards-in-generics https://codegym.cc/groups/posts/290-type-erasure

Lucas Hoage

Level 14 , Savannah, United States

12 June 2020, 03:13

Thank you for the follow up. Glad it's almost the weekend so I can dive into this.