java - "The value of the field speed is the average speed in knots"添加值

Question

好吧，我是编程新手，我想知道如何打印某些字段的值。例如，我有一个速度，单位是节(21 节)，如何将“节”部分添加到我的代码中，这样我就不会只打印整数？我希望它有 [number] 节。这是我到目前为止的代码:

public class Ship {
   //fields
   private String name;
   private double speed;

   //constructors
   public Ship(String n, double s) {
      name = n;
      speed = s;
   }

   //methods
   public String getName() {
      return name;
   }
   public double getSpeed()   {
      return speed; //avg speed in knots
   }

   public double timeTravel(double distance) {
      double travel = speed * 1.151;
      return distance;

   }
}

Answer 1

您可以更改:

public double getSpeed()   {
      return speed; //avg speed in knots
   }

至:

  public String getSpeed()   {
          return speed+" knots"; 
       }