How do i print one element of an arraylist to uppurcase while the other elements lowercase

public static void main(String[] args) { String[] days = {"monday","saturday","tuesday","sunday","friday"};

ArrayList<String> weekdays = new ArrayList();
weekdays.add("monday");
weekdays.add("thursday");
weekdays.add("wednesday");
weekdays.add("surtaday");
weekdays.add("tuesday");
weekdays.add("sunday");
weekdays.add("friday");

// Loop through the ArrayList, printing out "sunday" elements in

for(int i=0;i<weekdays.size();i++){
    
    System.out.println(weekdays.get(i));

}