how to get a day of week when i know the date?

how to get a day of week when i know the date?

i want to get the day of week in an array when i have an array of dates in
String with me.. here is my code:
SimpleDateFormat sourceDateformat = new SimpleDateFormat("yyyy-MM-dd");
public String[] temp_date;
public Int[] day = new Int[5];
Date[] d1= new Date[5];
Calendar[] cal= new Calendar[5]
try {
d1[i]= sourceDateformat.parse(temp_date[i].toString());
cal[i].setTime(d1[i]); // its not compiling this line..showing
error on this line
day[i]= cal[i].get(Calendar.DAY_OF_WEEK);
}
catch (ParseException e) {
e.printStackTrace();
}
if anyone can help please ?