CODEWITHSUNDEEP
java
Michael
Michael

Reputation: 17

Java - how to get maximum result of a calculation

We are working on creating object and driver classes. I have an object class that does various things to a moving exploratory robot.

What I need to do now is create a method that returns the largest distance that the robot moved in one single move command. I also need to return the time that it took to move that distance.

Here's the relevant code for that so far:

{

private int xcoord, ycoord; //Cartesian coordinates of the robot
private int identification; //Identification number of the robot
private double rate; //Rate at which the robot explores
private double traveled; //Distance the robot has travelled
private double timeSpent; //Time spent travelling
private double longestLeg; //Longest leg of the journey
private double longestLegTime; //Time on the longest leg

//Sets up a robot with the given ID number and beginning x and y coordinates
public Robot (int id, int x, int y) 
{
  identification = id;
  xcoord = x;
  ycoord = y;
  traveled = 0;
  rate = 5.0;
}

//Has the robot travel to the set coordinates
public double setDestination (int x, int y)
{
  double distance = Math.pow(x - xcoord, 2) + Math.pow(y - ycoord, 2);
  traveled += Math.sqrt(distance);
  xcoord = x;
  ycoord = y;
  timeSpent += Math.sqrt(distance)/rate;

  return traveled;
}

//Gets the time spent travelling
public double getTimeSpent()
{
  return timeSpent;
}


//Sets the rate at which the robot travels
public void setRate(double setrate)
{
  rate = setrate;
}

//Returns longest leg of the robot's travels
public int getLongestLeg()
{
  return longestLeg;
}

//Returns time of longest leg
public double getLongestLegTime()
{
  return longestLegTime;
}

I'm not allowed to use if statements or loops yet, so it will have to be using Math.max I'm guessing. I tried using it, but it gave me an error saying that it required an int but I supplied a double.

Any suggestions would be awesome. Thanks!

If you are able, I have one final problem with the code as well. I need to create a method that would get the distance between two Robot objects. I'm not even sure how to start this one since we haven't really worked with it yet. A suggestion on how to even start this would be great. Thanks again.

Upvotes: 0

Views: 83

Answers (2)

dawner
dawner

Reputation: 468

To avoid casting, this should work:

longestLeg = Math.max(distance, longestLeg);

If you are getting an error about requiring an int, it probably means one of your parameters was an int when it shouldn't be. Can't be sure without seeing exactly how you were calling it, but I suspect it may have been to do with the fact getLongestLeg() is returning longestLeg as an int when it's actually a double. I would suggest changing that method to:

//Returns longest leg of the robot's travels
public double getLongestLeg()
{
  return longestLeg;
}

In terms of your second question, to calculate the distance between another robot, the calcDist() method should probably look something like this:

   public double calcDist(Robot other)
    {
      return Math.sqrt(Math.pow(this.getX() - other.getX(), 2) + Math.pow(this.getY() - other.getY(), 2));
    }

Upvotes: 1

Stefan Stawiarski
Stefan Stawiarski

Reputation: 77

If i got your question right you just wanted to use the Math.max() with Integers.

Try 

(int) Math.max()

Upvotes: 0

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