递归/巴比伦方法Java

Question

我试图制作一个计算平方根的递归代码。

我需要测试我的猜测(difference between x and guess*guess)。

如果猜测不够准确，你需要再次猜测。

新猜测应为= 0.5 * (lastGuess + x / lastGuess)。

如何将用户输入分配到x，然后将x发送到squareRoot方法以计算平方根？

另外，我想我需要一个while循环来继续猜测，直到答案足够接近？

这就是我现在所拥有的：

import java.util.Scanner;

public class Recursive
{
    public static void main(String []args)
{
    Scanner keyboard = new Scanner(System.in);

     double x;
     double error;

     System.out.println("Enter a number that you want the square root of");
     x = keyboard.nextDouble();

     double guess = x / 2;

     System.out.println("Enter an acceptable error");
     error = keyboard.nextDouble();

     System.out.println("The square root of " + x + " is " + squareRoot(x, guess, error));


  }

  public static double squareRoot(double x, double guess, double error)
  {
    double newGuess;

    if(Math.abs(guess * guess - x) <= error)
    {
      return guess;
    }
    else
    {
      newGuess = 0.5 * (guess + (x / guess));
     return newGuess;

    }

   }
}