Vector3D

package MyGeometryLib;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Vector3D implements Vector {

    //region Field

    private double x;
    private double y;
    private double z;

    //endregion

    Vector3D(double x, double y, double z) {
        this.x = x;
        this.y = y;
        this.z = z;
    }

    //region Options

    @Override
    public int dimension() {
        String name = Vector3D.class.getSimpleName();
        String dimension = "";

        Pattern pattern = Pattern.compile("(\\d)+D");
        Matcher matcher = pattern.matcher(name);

        while (matcher.find()) {
            dimension = name.substring(matcher.start(), matcher.end() - 1);
        }

        return Integer.parseInt(dimension);
    }

    @Override
    public double getComponent(int i) {
        switch (i) {
            case 0:
                return x;
            case 1:
                return y;
            default:
                return z;
        }
    }

    @Override
    public double scalar(Vector vector) {
        return this.x*vector.getComponent(0) +
                this.y*vector.getComponent(1) +
                this.z*vector.getComponent(2);
    }

    @Override
    public double len() {
        return Math.sqrt(x*x+y*y+z*z);
    }

    @Override
    public Vector multiply(double factor) {
        return new Vector3D(
                this.x*factor,
                this.y*factor,
                this.z*factor
        );
    }

    @Override
    public Vector add(Vector vector) {
        return new Vector3D(
                this.x + vector.getComponent(0),
                this.y + vector.getComponent(1),
                this.z + vector.getComponent(2)
        );
    }

    @Override
    public Vector sub(Vector vector) {
        return new Vector3D(
                this.x - vector.getComponent(0),
                this.y - vector.getComponent(1),
                this.z - vector.getComponent(2)
        );
    }

    //endregion

    @Override
    public boolean equals(Object obj) {
        //Если сравниваем оди и тот же вектор
        if (obj == this) {
            return true;
        }

        //Смотрим что мы сравниваем объекты одного типа и что он не null
        if (obj == null || obj.getClass() != this.getClass()) {
            return false;
        }

        Vector3D vector = (Vector3D) obj;

        return this.x == vector.getComponent(0) &&
                this.y == vector.getComponent(1) &&
                this.z == vector.getComponent(2);
    }
}