I didn't understand what is the probmem.

Question about the task

Under discussion

package com.codegym.task.task13.task1306;

/*
Buggy initializeIdAndName

*/

public class Solution {
    public static void main(String[] args) throws Exception {
        System.out.println(Matrix.NEO);
        System.out.println(Matrix.TRINITY);
    }

    static class Matrix {
        public static DBObject NEO = new User().initializeIdAndName(1, "Neo");
        public static DBObject TRINITY = new User().initializeIdAndName(2, "Trinity");
    }

    interface DBObject {
        DBObject initializeIdAndName(long id, String name);
    }

    static class User implements DBObject {
        long id;
        String name;

        @Override
        public String toString() {
            return String.format("The user's name is %s, id = %d", name, id);
        }

        @Override
        public DBObject initializeIdAndName(long id, String name) {

            User user = new User();
            user.id= id;
            user.name = name;
            return user;
        }
    }

}

1. Think about what is wrong with the program.
2. Implement the initializeIdAndName method in the User class.
3. The User class's initializeIdAndName method must return a User.
4. Correct the program so it compiles and runs.

Requirements:

The DBObject interface must declare, but not implement, the initializeIdAndName method.
Implement the initializeIdAndName method in the User class.
The User class's initializeIdAndName method must return a User.
The initializeIdAndName method must set the User object's id and name fields equal to the passed arguments and then return the object.

package com.codegym.task.task13.task1306; /* Buggy initializeIdAndName */ public class Solution { public static void main(String[] args) throws Exception { System.out.println(Matrix.NEO); System.out.println(Matrix.TRINITY); } static class Matrix { public static DBObject NEO = new User().initializeIdAndName(1, "Neo"); public static DBObject TRINITY = new User().initializeIdAndName(2, "Trinity"); } interface DBObject { DBObject initializeIdAndName(long id, String name); } static class User implements DBObject { long id; String name; @Override public String toString() { return String.format("The user's name is %s, id = %d", name, id); } @Override public DBObject initializeIdAndName(long id, String name) { User user = new User(); user.id= id; user.name = name; return user; } } }

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Artem Divertitto Senior Android Developer at United Tech

7 April 2020, 17:30

Be attentive, method initializeIdAndName have to return User, not DBObject. And you shouldn't create new User, initialize current variables and return "this"