我看到下面的
Java代码看起来不错,但从不编译：
public class UnwelcomeGuest {
public static final long GUEST_USER_ID = -1;
private static final long USER_ID;
static {
try {
USER_ID = getUserIdFromEnvironment();
} catch (IdUnavailableException e) {
USER_ID = GUEST_USER_ID;
System.out.println("Logging in as guest");
}
}
private static long getUserIdFromEnvironment()
throws IdUnavailableException {
throw new IdUnavailableException(); // Simulate an error
}
public static void main(String[] args) {
System.out.println("User ID: " + USER_ID);
}
}//Class ends here
//User defined Exception
class IdUnavailableException extends Exception {
IdUnavailableException() { }
}//Class ends here
以下是IDE中的错误信息：
变量USER_ID可能已经被分配.
静态最终变量的值赋值有问题吗？
