java使用Supplier接口的get生产一个数据

import java.util.Spliterator;
import java.util.function.Supplier;
 
public class demo_getmax {
    public static int getmax(Integer[] in, Supplier<Integer> sup) {
        return sup.get();
    }
 
    public static void main(String[] args) {
        Integer[] in = {1, 4, 2, 7, 9, 3,-20,24};
        int max_ = getmax(in, () -> {
            int max = in[0];
            for (Integer integer : in) {
                if (integer > max) {
                    max = integer;
                }
            }
            return max;
        });
        System.out.println(max_);
 
    }
}