what's wrong with this code?Also i don't understand how it works completely

Question about the task

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Create a Rectangle class. The data for this class will be top, left, width, height.
Create as many initialize(...) methods as possible

Here are some examples:
- 4 parameters are specified: left, top, width, and height
- width/height is not specified (both are 0)
- height is not specified (it is equal to the width), we'll create a square
- create a copy of another rectangle passed as an argument

Requirements:

The program must not read data from the keyboard.
The Rectangle class must have int variables top, left, width and height.
The class must have at least one initialize method.
The class must have at least two initialize methods.
The class must have at least three initialize methods.
The class must have at least four initialize methods.

package com.codegym.task.task05.task0513; /* Let's put together a rectangle */ public class Rectangle { //write your code here private int top ; private int left; private int width; private int height; public void initialize(int top){ this.top = top; } public void initialize(int top, int left){ this.top = top; this.left = left; width = 0; height = 0; } public void initalize(int top , int left , int width){ this.top = top; this.left = left ; this.width = width; height = width; } public void initalize(int top,int left,int height,int width){ this.left= left; this.top = top; this.height = height; this.width = width; } public static void main(String[] args) { } }

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envy

Level 6 , Detroit, United States

11 February 2021, 05:46

I have a basic question and sorry if this dumb, but just trying to get the concept right. Since the variables here are not class variables, dont they have to be referenced with the this keyword in the methods they are used? For eg in this section, the width and height initializations should be this.height and this.weight

public void initialize(int top, int left){

    this.top = top;
    this.left = left;
    width = 0;
    height = 0;
}

Nouser

Level 36 , Germany

11 February 2021, 07:12

The problem is, that top and left variables aren't unambiguous here. They are parameters and instance varibales. In such a case the 'most inner' variables get used. So if you want to refer to the instance variable you need some way to address them and that's this. If the nameing is unambiguous you can omit this but it does not harm either. this means the current object and this.top you can translate with the variable top of the current object. Then this.top = top; means: assign the argument top to the instance variable top of the current object.