import java.util.ArrayList; import java.util.Iterator; import java.util.List; import com.google.gson.Gson; import com.cctvmall.entity.Human; import com.cctvmall.entity.Person; public class Hello { public static void main(String[] args) { /* System.out.println("Chen Jian Ping"); int a = 5; a = a + 1; System.out.println(a); */ Human human = new Human(); human.Hu(); List humanlist = human.tasks(); Iterator iter = humanlist.iterator(); while(iter.hasNext()) { System.out.println(iter.next()); } Gson g = new Gson(); String json = g.toJson(humanlist); System.out.println(json); List list = new ArrayList<>(); int i = 3; while(i > 0) { Person p = new Person(i, "chen jian ping", "BeiJin"); list.add(p); i--; } System.out.println(g.toJson(list)); } }