AbstractJeans?

Question about the task

Online store for jeans

Java Multithreading, Level 4, Lesson 6

Resolved

Can't get it - AbstractJeans is abstract, what to do with:

new AbstractJeans(id, length, size, price)

1. Create 2 interfaces in separate files:
1.1) Item with int getId(), double getPrice(), and String getTM() methods
1.2) Jeans extends Item with the int getLength() and int getSize() methods

2. In the Util class, add the missing Java code to the getAllJeans method:
2.1) figure out what the Util class's getAllJeans method already has
2.2) create an abstract AbstractJeans class using the Jeans interface with one abstract method, and implement the remaining methods
2.3) create Levis and Armani classes using AbstractJeans, and implement the remaining method
2.4) Implement the toString() method in the AbstractJeans class (you can use Alt+Insert -> toString())
2.5) the output of the AbstractJeans class's toString method should start with the name of the subclass, for example, Levis{id=1, length=34, size=6, price=150.0}

Requirements:

The Item interface must be in a separate file.
The Jeans interface must extend the Item interface and be created in a separate file.
The Item interface must include all the methods listed in the task conditions.
The Jeans class must include all the methods listed in the task conditions.
A local abstract AbstractJeans class that supports the Jeans interface must be created in the Util class's getAllJeans method.
A local Levis class that inherits the AbstractJeans class must be created in the Util class's getAllJeans method.
A local Armani class that inherits the AbstractJeans class must be created in the Util class's getAllJeans method.
The AbstractJeans class must implement a toString() method whose output starts with name of the subclass.

package com.codegym.task.task24.task2409; import java.util.*; /* Online store for jeans */ public class Solution { public static List<Jeans> allJeans = Util.getAllJeans(); public static void main(String[] args) { for (Jeans jeans : allJeans) { System.out.println(jeans); } } }

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Guadalupe Gagnon

Level 37 , Tampa, United States

7 May 2019, 20:34

#1 The abstractJeans class should be abstract.

abstract class AbstractJeans implements Jeans{}

#2 The property tm at line 21 is not used and is not needed, you can delete line 21, the method getTM() (line 53) should be abstract, which means that it won't have code in the parent class but must have code in the child classes. The over ridden ones in Levi and Armani class should return the appropriate enumeration from line 169, for example: Company.Levis.toString() #3 The constructor in both Levis and Armani class should be like this:

// public Armani(...)
public Levi(public Levis(int id, int length, int size, double price) {
   super(id, length, size, price);
}

All that other code in there did nothing. #4 The Levi and Armani class already have all the methods in that the Jeans class has by inheritance, you don't need to code them again unless they are supposed actually over ride and do something completely different. Remove each and every one of the get methods, other than TM because it is abstract in the parent class, from both the sub classes. #5 change line 35 in the toString method in abstractJeans so that it appends getTM() instead of getSimpleClass. There are 2 anonymous classes for 'Lucky' and 'Calvin Klien' which will not output properly with the getSimpleClass.

Павел Артеменко

Level 41 , Krasnodar, Russian Federation

8 May 2019, 06:35

Thanks, I did not noticed, that it is creation of anonimous class, rather then creation of instance of AbstractJeans )