i did everything right, but it doesn't work

Question about the task

Creating cats

Java Syntax, Level 5, Lesson 9

Resolved

i dunno what's wrong

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 public static int weight, age; public static String name, color, address; public Cat(String name){ Cat.name = name; Cat.weight = 5; Cat.age = 5; Cat.color = "brown"; } public Cat(String name, int weight, int age) { Cat.name = name; Cat.weight = weight; Cat.age = age; Cat.color = "brown"; } public Cat(String name, int age) { Cat.name = name; Cat.age = age; Cat.weight = 5; Cat.color = "brown"; } public Cat(int weight, String color) { Cat.weight = weight; Cat.color = color; Cat.age = 5; } public Cat(int weight, String color, String address) { Cat.weight = weight; Cat.color = color; Cat.age = 5; Cat.address = address; } public static void main(String[] args) { } }

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Jeff Jeffy

Level 15 , Irvine, United States

30 November 2020, 19:58

solution

This doesn't work for a multitude of reasons. Your variables are static. This means they aren't unique to an object, only to the class.

public static int weight, age;

should be

public int weight, age;

Next, you are using Cat.variable to define a variable. This works because the variables are static, but they really shouldn't be. Instead, use this.variable for variable declaration.

this.weight = weight;
//this.weight represents the public int weight, and weight represents int weight from the constructor.

Also something to add, it's best not to assume that you did everything right and that it's failing for no reason, if it says you did something wrong, assume that you did do something wrong. Ask what did I do wrong and why doesn't it work instead of "I did everything right but it doesn't work."

gabe

Level 6 , Greenville, United States

1 December 2020, 17:15

Thanks! will keep the last bit in mind