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We know that there are several deprecated items in Java.
Will they be removed? Have any deprecated items ever been removed from Java?
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A deprecated class or method is like that. It is no longer important. It is so unimportant, in fact, that you should no longer use it, since it has been superseded and may cease to exist in the future.
Similarly, when a class or method is deprecated, it means that the class or method is no longer considered important. It is so unimportant, in fact, that it should no longer be used at all, as it might well cease to exist in the future. The need for deprecation comes about because as a class evolves, its API changes.
A program element annotated @Deprecated is one that programmers are discouraged from using, typically because it is dangerous, or because a better alternative exists. Compilers warn when a deprecated program element is used or overridden in non-deprecated code.
It means that it is bad practice to use it. It can still be used, but eventually it will not work with other things because it is no longer being supported. Best practice is to use the requested alternative to any depreciated type.
Will they be removed?
Unlikely since java has always been about maintaining backward compability, but it can happen. I see deprecations as a warning that the API is either unreliable or somehow seriously flawed. (Thread has several of these).
Has any of the deprecated items in the past has been removed from java?
AFAIC not removed but never implemented Thread.destroy(), as it was along with several other Thread methods inherently unsafe.
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