I wanna send data received as user input in Processing to the arduino to use that data. In my processing code below, i need to send the variables "h" and "m" to the arduino. The arduino in turn should use those data to do something else but i guess my question is: how does arduino reference H and m from processing? Pls help. Thanks!

//Processing code
import javax.swing.JOptionPane;

String user_hour  = (String)JOptionPane.showInputDialog(null, "Hour :","Datainputdialog", JOptionPane.PLAIN_MESSAGE);
         String user_min  = (String)JOptionPane.showInputDialog(null, "Minute:","Datainputdialog", JOptionPane.PLAIN_MESSAGE);
         int h = Integer.parseInt(user_hour);
         int m = Integer.parseInt(user_min);

//Arduino code
time_t  alarmOnTime =  (h* SECS_PER_HOUR) + (m * SECS_PER_MIN);