Happy hour sale

import java.util.Calendar;
 
 Calendar cal = Calendar.getInstance();
 int hour = cal.get(Calendar.HOUR_OF_DAY);
 
 //Discount
 discountrate = 0.2;
 
 //Happy hour range
 start = 12;
 end = 16; 
 
 if (hour>=start && hour<end) {
   p = line.getPrice();
   line.setSalePrice(p - (p*discountrate));
 }

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