CodeGym/Help with Java Tasks/Why do I keep failing the 1st requirement?

Level 2

United States of America

22.01.2020
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9comments

Why do I keep failing the 1st requirement?

Question about the task

Initializing cats

Java Syntax, Level 5, Lesson 7

Resolved

Why do I keep failing the 1st requirement?

Create a Cat class with five initializers:
- Name,
- Name, weight, age
- Name, age (standard weight)
- Weight, color (unknown name, address and age, i.e. a homeless cat)
- Weight, color, address (someone else's pet)

The initializer'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 program must not read data from the keyboard.
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 an initialize method that takes a name as an argument, but initializes all variables except the address.
The class must have an initialize method that takes a name, weight, and age as arguments, but initializes all variables except the address.
The class must have an initialize method that takes a name and age as arguments, and initializes all variables except the address.
The class must have an initialize method that takes a weight and color as arguments, and initializes all variables except the name and address.
The class must have an initialize method that takes a weight, color, and address as arguments, but initializes all variables except the name.

package com.codegym.task.task05.task0510; public class Cat { private String name = null; private int age; private int weight; private String address = null; private String color; public void initialize(String name){ this.name = name; age = 4; weight = 7; color = "black"; } public void initialize(String name, int weight, int age){ this.name = name; this.age = age; this.weight = weight; color = "gray"; } public void initialize(String name, int age){ this.name = name; this.age = age; weight = 5; color = "orange"; } public void initialize(int weight, String color){ age = 6; this.weight = weight; this.color = color; } public void initialize(int weight, String color, String address){ age = 5; this.weight = weight; this.address = address; this.color = color; } public void main(String[] args) { } }

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Anonymous #11409469

Level 5 , Argentina

27 February 2024, 22:18

you shoul put the "private" as public

0

Guadalupe Gagnon

Level 37 , Tampa, United States

24 January 2020, 19:42

solution

try removing the word "private" from lines 5-9. edit: Actually you changed the main method. It should be: public static void main(String[] args) { }

+2

Level 2 , United States of America, United States

Expert

25 January 2020, 00:35

I AM AN IDIOT!! Thank you so much for catching that stupid mistake!

+1

Guadalupe Gagnon

Level 37 , Tampa, United States

25 January 2020, 04:52

Yup, you should quit programming now. Lol I'm just kidding. I have personally made similar mistakes too and many more. It took me a long time to just figure this one out because my eyes were just scanning over the main method without even registering in the brain that it was different. Anyways, keep chugging along and I'll help in the future if youre stuck again on a task.

+3

Level 2 , United States of America, United States

Expert

24 January 2020, 17:50

I have even tried copy/paste on some answers that were supposed to work... nothing is working.

0

Level 2 , United States of America, United States

Expert

24 January 2020, 17:49

I have tried all the recommendations so far. Nothing is working. I keep getting java.lang.NullPointerException..

+1

Level 2 , United States of America, United States

Expert

23 January 2020, 01:34

I just tried this... its no better. public class Cat { private String name; private int age; private int weight; private String address; private String color; public void initialize(String name){ this.name = name; this.age = 4; this.weight = 7; this.color = "black"; this.address = null; } public void initialize(String name, int weight, int age){ this.name = name; this.age = age; this.weight = weight; this.color = "gray"; this.address = null; } public void initialize(String name, int age){ this.name = name; this.age = age; this.weight = 5; this.color = "orange"; this.address = null; } public void initialize(int weight, String color){ this.name = null;; this.age = 6; this.weight = weight; this.color = color; this.address = null;; } public void initialize(int weight, String color, String address){ this.name = null; this.age = 5; this.weight = weight; this.address = address; this.color = color; }

0

Level 18 , Johannesburg, South Africa

22 January 2020, 11:50

Looking at you code it seems ok to me .Comparing it to mine below it seems similar with the exception ,that I included the "null" variables in most initializers. I'm not sure but I think that's where your problem might be. Take a look: public class Cat { String name = null , address = null , color ; int age , weight ; public void initialize(String name) { this.name = name ; this.weight = 5 ; this.color = "brown" ; this.age = 2 ; address = null ; } public void initialize(String name ,int weight ,int age ) { this.weight = weight ; this.name = name ; this.age = age ; this.color = "brown" ; address = null ; } public void initialize(String name , int age ) { this.name = name ; this.age = age ; } public void initialize(int weight , String color ) { this.weight = weight ; this.color = color ; this.age = 3 ; name = null ; address = null ; } public void initialize(int weight , String color , String address) { this.weight = weight ; this.color = color ; this.address = address ; this.age = 4 ; name = null ; } public static void main(String[] args) { } }

0

Level 30 , London, United Kingdom

22 January 2020, 10:51

Try changing lines 13, 14, 15, 22, 28, 29, 33, and 39 to this.variable I appreciate it can be confusing because we use the same variable name for the passed argument as for the class' field. But to break it down a bit, when we say for example.

this.name = name;

what we're actually saying is: the name field of this class i.e. the variable declared on line 5 (in your code) should be assigned the value of the passed argument

+1