Java 8 VS Java 15

Point.java

public final class Point {
  public final double x;
  public final double y;

  public Point(double x, double y) {
    this.x = x;
    this.y = y;
  }

  @Override
  public boolean equals(Object that) {
    if(that == this)
      return true;
    if(that == null || that.getClass() != getClass())
      return false;
      
    var q = (Point) that;
    if(x != q.x) return false;
    return y == q.y;
  }

  @Override
  public int hashCode() {
    int hash = 17;  // non-zero constant
    hash = 31*hash + ((Double) x).hashCode();
    hash = 31*hash + ((Double) y).hashCode();
    return hash;
  }

  public double distTo(Point q) {
    double dx = x - q.x;
    double dy = y - q.y;
    return Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));
  }
}

public record Point(double x, double y) {
  public double distTo(Point q) {
    var dx = x - q.x;
    var dy = y - q.y;
    return Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));
  }
}