Java method with array containing interface objects as parameter

Question

So I have and interface that is implemented by a class called Vehicle that accepts a double value as the parameter:

public class Vehicle implements Efficiency
{
  //instance variable
  private double efficiency;

  public Vehicle(double x)
  {
  //parameter initializes the instance variable 
  x = efficiency; 
}

This is the interface:

public interface Efficiency 
{
  double getEfficiency(); 
}

I need to create a method called getFirstBelowT() that accepts an Efficiency array and a double as parameters. The method is supposed to return an Efficiency object that is the first object in the array that is less than the double value in the parameter. How can I compare the elements in the Efficiency array to the double value? This is what I have so far:

//a method that returns an Efficiency object that is the first
//object in the array with a efficiency below the double parameter

public static Efficiency getFirstBelowT(Efficiency[] x, double y)
{ 
    //loop through each value in the array
    for(Efficiency z: x)
    {
        //if the value at the index is less than the double
        if(z < y)
        {   //returns the first value that is less than y and stops looping
            // through the array.
            return z; 
            break; 
        }
    }
    //returns null if none of the element values are less than the double                
    return null;
}

"parameter initializes the instance variable " No: efficiency = x would initialize the member variable, you are overwriting the parameter value with zero. — Andy Turner
– Andy Turner, Commented Oct 25, 2015 at 23:58

Andy Turner · Accepted Answer · 2015-10-26 00:25:21Z

1

You're basically there:

You'd need to call the getEfficiency method in the conditional:
```
if(z.getEfficiency() < y)
```
Get rid of the break after the return: it's unreachable code.

edited Oct 26, 2015 at 0:25

answered Oct 25, 2015 at 23:59

Andy Turner

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1 Comment

Code.girl Over a year ago

Ya, I had forgotten to do that. I got it to work. Thank you very much.

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