Java? finalize ???? Object ????? ???? ??????. GC? ??? ???? ??? ??? ??? ??? ?? ?? ?? finalize() ???? ?????.
finalize() ???? Object ????? ???? ??????. GC? ??? ???? ??? ??? ??? ??? ?? ?? ?? finalize() ???? ?????. Object? ??? ?? ???? ????.
protected void finalize() throws Throwable { }1 finalize() ??
???? C++ ???? ????(Java??? ??? ???? ?????). GC? ?? ?? ??? ????? ???? finalize ???? ? ??? ????? ??? ???(??? ??? ????? ??? ????), ????? ??? ????(????? ???? ??). ???? ??? ??? ??? ??????).
public class Finalizer {
@Override
protected void finalize() throws Throwable {
System.out.println("Finalizer-->finalize()");
}
public static void main(String[] args) {
Finalizer f = new Finalizer();
f = null;
}
}
//無輸出public class Finalizer {
@Override
protected void finalize() throws Throwable {
System.out.println("Finalizer-->finalize()");
}
public static void main(String[] args) {
Finalizer f = new Finalizer();
f = null;
System.gc();//手動(dòng)請求gc
}
}
//輸出 Finalizer-->finalize()2 ?? ???? ???
finalize() ???? ????? ???? ?? ???(?: ?? ?? ???, ?????? ?? ?)? ????? ???? ?? ???? ???? ? ?????. Java ???(???? ???))(?: C ??? malloc() ??? ??).
3 ??? ??? ?? ??
?? finalize() ???? ???? ??? ?????? ?? ??? ??? ? ?? ? ???? finalize?? ???? ??? ?? () ???? ?????. ? ??? ??? ???. ??? ???? ??? ????? ?? finalize() ???? ??? ?? ????. ??? ???? ?? ???? ?? gc? ????? ?? ??? ???? ???? ?? ??? ???? close() ???? ???? ????. ?????? ???? ????? ???.
?? finalize() ???? ????? ??? ????? ? ? ?? ??? ????? ?? ??? ??? ?????.
4 ??? ?? ??????
finalize() ???? ?? ? ?? ???? ??? ???? ??? ?? ??? ??? ? ????.
class User{
public static User user = null;
@Override
protected void finalize() throws Throwable {
System.out.println("User-->finalize()");
user = this;
}
}
public class FinalizerTest {
public static void main(String[] args) throws InterruptedException {
User user = new User();
user = null;
System.gc();
Thread.sleep(1000);
user = User.user;
System.out.println(user != null);//true
user = null;
System.gc();
Thread.sleep(1000);
System.out.println(user != null);//false
}
}?? ????: "java tutorial"
? ??? Java?? finalize ???? ??? ??????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!
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