package example.StaticExample; /** * static field and static method. * * Reference: * - https://www.liaoxuefeng.com/wiki/1252599548343744/1260464690677856 * */ public class Person implements Human { public String name; public int age; public static int number; // static field. public Person() { } public Person(String n, int a) { this.name = n; this.age = a; } public static void setNumber(int value) { number = value; } }