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public class Demo_Largest {
 
    public static void main(String[] args) {
 
        ArrayList<Integer> list = new ArrayList<>();
 
        for (int i = 0; i < 10; i++) {
            list.add(i);
        }
        System.out.println(max(list));
 
    }
 
    public static <E extends Comparable<E>> E max(ArrayList<E> list) {
        E max = list.get(0);
 
        for (int i = 1; i < list.size(); i++) {
            if (list.get(i).compareTo(max) > 0) {
                max = list.get(i);
            }
        }
 
        return max;
    }
}

Main.java:1: error: class Demo_Largest is public, should be declared in a file named Demo_Largest.java
public class Demo_Largest {
       ^
Main.java:14: error: cannot find symbol
    public static <E extends Comparable<E>> E max(ArrayList<E> list) {
                                                  ^
  symbol:   class ArrayList
  location: class Demo_Largest
Main.java:5: error: cannot find symbol
        ArrayList<Integer> list = new ArrayList<>();
        ^
  symbol:   class ArrayList
  location: class Demo_Largest
Main.java:5: error: cannot find symbol
        ArrayList<Integer> list = new ArrayList<>();
                                      ^
  symbol:   class ArrayList
  location: class Demo_Largest
4 errors

Standard output is empty