java - 我试图将双变量从一种方法调用到另一种方法中

Question

如何将长度和宽度变量调用到 getArea 方法中，而不在类中创建私有(private)变量，我这样做的方式是导致该方法在已经运行一次后再次运行。我真的不喜欢这种方式，但这就是教授希望的方式来模拟“面向对象编程”之前的时代

/*This program allows the user to enter the length and widtch and receive the area
 of the rectangle*/

 import java.util.Scanner;

public class theRectangleCompany
{
  public static void main(String[] args)
  {
    System.out.print("This program will find an area of a Rectangle ");
    getLength();
    getWidth();
    getArea();
  }

  public static double getLength()
  {
    double length;
    Scanner keyboard = new Scanner(System.in);
    System.out.print("Please enter the length ");
    length = keyboard.nextDouble();
    return length;
  }

  public static double  getWidth()
  {
     double width;
     Scanner keyboard = new Scanner(System.in);
     System.out.print("Please enter the width ");
     width = keyboard.nextDouble();
     return width;
  }

  public static void getArea()
    {
      double length = getLength();
      double width = getWidth();
      double area = width * length;
      System.out.println("The area of the Rectangle is: " +area);

    }


}

Answer 1

为什么要从 main 方法调用 getLength() 和 getWidth()。只需调用 getArea()

public static void main(String[] args)
  {
    System.out.print("This program will find an area of a Rectangle ");
    getArea();
  }