because I want to grab the location of the server want to know how to enable the user to open the server with the GPS function? whether it s a mobile phone or turn on when I turn on the shutter to access my network will ask whether I can get the loc...
the on-board system needs accurate positioning to calculate the mileage data relationship between the life and death of the car (whether it is abandoned or not) it is well known that there is a deviation of 5-10 meters in gps positioning. Now we can l...
as detailed in the title: just after the interview, I came to write down such a question. has not been tested yet, and I hope you will not test it, leaving your analysis process and answers . 1. Everything is caused by a line I wrote that uses the ...
void Parker::park(bool isAbsolute, jlong time) { Optional fast-path check: Return immediately if a permit is available. if (_counter > 0) { _counter = 0 ; OrderAccess::fence(); return ; } Thread* thread = Thread::cur...
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>< title> <style type="text css"> -sharp1{ width: 600px; height: 300...
I want to write a public method that passes in two objects of the same type an and b, and returns b if an is null public static ifObj(Object a, Object b) { if(null == a) { return b; }else { return a; } } Obj obj = ifObj(xxx...
one of my requirements is to use canvas to synthesize the product information and the QR code into a picture, in which the product picture is cross-domain and the nginx forward proxy is used. the problem encountered is that Google, Firefox and Androi...