Help please;

Question about the task

Creating cats

Java Syntax, Level 5, Lesson 9

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I thought I did this correctly this time, but clearly not. I'm obviously missing something that I'm not seeing.

Create the Cat class with five constructors:
- Name,
- Name, weight, age
- Name, age (standard weight)
- Weight, color (name, address, and age are unknown; the cat is homeless)
- Weight, color, address (someone else's pet)

The constructor's job is to make the object valid.
For example, if the weight is unknown, then you need to specify some average weight.
A cat can't weigh nothing.
The same applies to age and color. But there may or may not be a name (i.e. name might be null).
The same applies to the address (it might be null).

Requirements:

The Cat class must have a String variable name.
The Cat class must have an int variable age.
The Cat class must have an int variable weight.
The Cat class must have a String variable address.
The Cat class must have a String variable color.
The class must have a constructor that takes a name as an argument, but initializes all variables except the address.
The class must have a constructor that takes a name, weight, and age as arguments, and initializes all variables except the address.
The class must have a constructor that takes a name and age as arguments, and initializes all variables except the address.
The class must have a constructor that takes a weight and color as arguments, and initializes all variables except the name and address.
The class must have a constructor that takes a weight, color, and address as arguments, and initializes all variables except the name.

package com.codegym.task.task05.task0517; /* Creating cats */ public class Cat { //write your code here String name=null; int weight; int age; String color; String address=null; public Cat(String name) { this.name="luna"; this.weight=20; this.age=6; this.color="grey"; } public Cat(String name, int weight, int age) { this.name="sherlock"; this.weight=15; this.age=8; this.color="grey"; } public Cat(String name, int age) { this.name="kenny"; this.weight=25; this.age=7; this.color="black"; } public Cat(int weight, String color) { this.weight=9; this.age=7; this.color="black and white"; } public Cat(int weight, String color, String address) { this.weight=10; this.age=12; this.color="orange"; this.address="wall street"; } public static void main(String[] args) { } }

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Sela

Level 20 , Poland

24 June 2020, 03:44

if you take a value as a constructor parameter you should assign an instance variable with this value, not just assign with something else what is constant during run-time e.g.

public Cat(String name)
    {
        this.name="luna";
          //you took a name as a parameter (String name)
          //but this.name is assigned with different value i.e. "luna"
        this.weight=20;
        this.age=6;
        this.color="grey";
    }

the proper solution would be:

public Cat(String name)
    {
        this.name=name; //we are using parameter String name now
        this.weight=20;
        this.age=6;
        this.color="grey";
    }

Niklas Braun

Level 33 , Freiburg, Germany

23 June 2020, 21:34

You only have to use standard values if no such arguments are in the constructor. But if such values available in the constructor you have to initialize these values.