What's wrong with Java code?

Question

Java

My task is:
1. Create a class shape
2. Create an array of points
3. Create a method that adds a point to an array of points (addPoint)
4. Create a method that calculates the perimeter of the shape
5. Test the program

I wrote like this:

import java.util.ArrayList;

public class Main
{
  public static void main(String[] args) {
    arrayList.addPoint(5.0,5.0,5.0);
    console.log(arrayList.perShape());
  }
}

class Shape {
    ArrayList<Double> arrayList = new ArrayList<>();
    
    public void addPoint(double x, double y, double z) {
        arrayList.add(x);
        arrayList.add(y);
        arrayList.add(z);
    }
    
    public double perShape() {
        double per = arrayList.get(0) + arrayList.get(1) + arrayList.get(2);
        return per;
    }
}

I'm getting an error and I don't know where. Does anyone know where my mistake is?

Answer 1

Learn to read compiler messages. And so everything is wrong with you, there are practically no correct lines in the code.
The point must contain its coordinates.
The array must contain dots, not doubles.
Its array must not be inside a point.
The perimeter of a single point is an oxymoron, and of course, the perimeter is not calculated by adding the coordinates.

Answer 2

In the Main class, the main method accesses the undeclared arrayList variable.
Further, in addition to a gross syntactic error, there is a logical one. When calculating the perimeter, you simply add up all the coordinates of the first point. It's definitely not the perimeter!
To determine the distance between two points, you need to take the square root of the sum of the squared differences of all coordinates.

Answer 3

console.log(arrayList.perShape());
Those. Doesn't it bother anyone that this line of code is not from Java at all, but rather from JavaScript?