About error message classname.java overrides or depriciated api

Question

this is sudhakar
i done java program and after compilation i got the message that
classname.java uses or overrides a depriciated api . then iam unable to do the next step please specify what is the reason and solution to this problem.

Answer 1

A deprecated API is one that has been targeted for destruction by the Bytecode Ninja Hit Squad. Basically, it's code that used to work, and still works, but at some point in the future, will probably stop working. Why? Because another way has been found to do the same thing--sometimes a better way, more often simply a more consistent way.
So, if your code is using or overriding a deprecated API, chances are, it works now but may not in the next version of Java (although those deprecated APIs do seem to keep hanging around and hanging around... backwards compatibility keeps things from being just plain wantonly deleted...). Therefore, it's recommended that you rewrite your code to eliminate the references to the deprecated APIs and use the newer replacement versions instead.
Now, how do you find out exacty what they are? Well, you recompile with -deprecated, just like the error message tells you. Instead of typing
javac MyApp.javayou type
javac MyApp.java -deprecatedI think. I say "I think" because I never do it, and may not be remembering the syntax perfectly. A quick glance at the documentation should clarify that for you.
So, why do I never do it? Because I use an IDE that does it for me. I just go to the compiler options and check the box that says "Report Uses of Deprecated APIs" and all the rest is automatic. If you are using an IDE, you may have a similar option available to you.
Now, once you know which code is referencing the deprecated APIs, what do you do? Simple. You read the documentation. Most often, the javadoc for the method in question will say something like,
@deprecated Use shinyNewMethod() instead.And so you replace your marked old method with the shiny new method (and if it's a FontMetrics-related method, you're gonna have loads of fun navigating that source code!) and all will be well, and you'll have kept that Bytecode Ninja Hit Squad off your trail for yet another day.
Sincerely,
Dylan