java編譯時出現的錯?

Question

Note: loing.java uses or overrides a deprecated API.Note: Recompile with -Xlint:deprecation for details.編譯完會產生.class程式一樣會執行請問這二段是幹嘛?

Answer 1

您用了以前的一個API，具體的說就是您用了某個方法，該方法以前可以用，但新的版本中已不建議使用（deprecated），您可以在編譯時：javac -Xlint:deprecation YourSource.java如此可以知道哪個方法已不建議使用，再查看一下最新的線上API，看看它建議您改用哪一個方法。。。例如Thread的stop()就不建議您再用，API上是這麼寫的： 
void
stop()


          Deprecated. This method is inherently unsafe. Stopping a thread with
Thread.stop causes it to unlock all of the monitors that it
has locked (as a natural consequence of the unchecked
ThreadDeath exception propagating up the stack). If
any of the objects previously protected by these monitors were in
an inconsistent state, the damaged objects become visible to
other threads, potentially resulting in arbitrary behavior. Many
uses of stop should be replaced by code that simply
modifies some variable to indicate that the target thread should
stop running. The target thread should check this variable
regularly, and return from its run method in an orderly fashion
if the variable indicates that it is to stop running. If the
target thread waits for long periods (on a condition variable,
for example), the interrupt method should be used to
interrupt the wait.
For more information, see
Why
are Thread.stop, Thread.suspend and Thread.resume Deprecated?.