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I have been programming in Smalltalk for some time, but I never really needed interfaces to implement anything. Then why can’t languages such as Java get rid of interfaces? Is it only Smalltalk or is there another language which doesn’t need interfaces?
Because Java is statically typed while Smalltalk is not. Interfaces don’t serve any purpose when you don’t declare types and your variables aren’t going to be typechecked. But in a statically typed language like Java, they’re extremely handy, because they let you have a variable whose type is defined by the methods the object implements instead of its class. It brings you a lot closer to the dynamic typing Smalltalk has natively without giving up the benefits of typechecking.