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import java.util.List; import java.util.Collections; public class Test{ public static void main(String...s) { List<Integer> numbers = new ArrayList<>(); Collections.addAll(numbers,new Integer[]{1,2,3,4,5,6,7}); Integer max = numbers.stream().max(Comparator.comparing(k->k)).get(); Integer min = numbers.stream().min(Comparator.comparing(k->k)).get(); System.out.println("max:"+max); System.out.println("min:"+min); } }