package test;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.List;

import java.util.Optional;

import java.util.function.Consumer;

import java.util.function.Predicate;

public class optionnaltest {

    class user{

        String name;

        String age;

        user(){}

        user(String name,String age){this.name = name;this.age=age;}

        void intoduce() {

            System.out.println("i am "+name+",i am "+age+" this year!");

        }

        String tosString() {

            return new StringBuffer().append("{name:").append(name+",age:").append(age+"}").toString();

        }

    }

    public static void main(String[] args) {

        List<user> list = new ArrayList<user>();

        Arrays.asList(10,11,12,14,16,20).forEach(new Consumer<Integer>() {

            @Override

            public void accept(Integer t) {

                optionnaltest op = new optionnaltest();

                if(t <12)

                    list.add(op.new user());

                else

                    list.add(op.new user("name"+t,t+""));

            }

        });

        List<user> tm = new ArrayList<user>();

        list.forEach(new Consumer<user>() {

            @Override

            public void accept(user t) {

                boolean flag = Optional.ofNullable(t).filter(s->s.name!=null).isPresent();

                tm.add(!flag?t:null);

            }

        });

        list.removeAll(tm);

        list.forEach(new Consumer<user>() {

            @Override

            public void accept(user t) {

                System.out.println(t.tosString());

            }

        });

    }

}