Adapter pattern and interfaces

Hi all! This year I started to study java language and as a person who used c language for a long time, I have some questions.If you can help me I ll appreciate that.
1-Can anybody tell me why we use Adapter pattern?I already read a lot about it but the point that I dont understand is,its always said that we use this pattern in case of an existing class does not support an interface that we want to implement.This is the main point where I have troubles.I mean why and when a class does not support an interface?According to my readings about interfaces,I think that interfaces are just for defining the names of the methods.When we create a class we implement any interface that we want and we fill inside of these methods in the class.So how a class can not support an interface when thats ourself who fill the inside of these methods?
I understood the main idea of this pattern but as you can see in deep inside I cant imagine where I can benefit from this pattern because I think that instead of using an interface we can just define the methods in the class and we dont have to use neither the adapter nor an interface.
2-Why interfaces are so important if we dont work in a big project.I mean according to my readings I think that interfaces are just guides for developper who are splitting the project.Why I have to use an interface?We can just define the names of the methods if I am not wrong so why they are so important?
Thank you very much in advance and good day to all.

vitamini.kabuunda wrote:
Hi all! This year I started to study java language and as a person who used c language for a long time, I have some questions.If you can help me I ll appreciate that.
1-Can anybody tell me why we use Adapter pattern?I already read a lot about it but the point that I dont understand is,its always said that we use this pattern in case of an existing class does not support an interface that we want to implement.This is the main point where I have troubles.I mean why and when a class does not support an interface?According to my readings about interfaces,I think that interfaces are just for defining the names of the methods.When we create a class we implement any interface that we want and we fill inside of these methods in the class.So how a class can not support an interface when thats ourself who fill the inside of these methods?
I understood the main idea of this pattern but as you can see in deep inside I cant imagine where I can benefit from this pattern because I think that instead of using an interface we can just define the methods in the class and we dont have to use neither the adapter nor an interface.when either the class or interface (or both) are outside of your control, you would use an adapter
2-Why interfaces are so important if we dont work in a big project.I mean according to my readings I think that interfaces are just guides for developper who are splitting the project.Why I have to use an interface?We can just define the names of the methods if I am not wrong so why they are so important?you don't have to use an interface, but if you ever want to create different implementations and not have to modify the code using it, an interface will come in handy

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Oracle EBS Based and Interface tables
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