Problem with interfaces

[adamgsell]

Hello, I'm having trouble implementing a class that uses a interface (known as Measurable).

Any help would be greatly appreciated as I am highly confused

My errors are:

cannot find symbol class Measurable
operator + cannot be applied to double, Measurable.getMeasure
incompatible types
and double cannot be dereferenced

my code is

public class DataSet
{
private double sum;
private int count;
private double maximum;


public DataSet()
{
sum=0;
count=0;
maximum=0;
}
public void add(Measurable x)
{
count++;
sum = sum + x.getMeasure();
if (count == 1 || x.getMeasure()>maximum.getMeasure()) maximum=x;
}
public double getSum()
{
return sum;
}
public int getCount()
{
return count;
}
public double getMaximum()
{
return maximum;
}
public double getAverage()
{
return sum/count;
}

}

[adamgsell]

actually scratch what I said earlier. New code with only one error cannot find symbol class Measurable. Any reason it can't find the class? (Measurable is the interface).

[sunde887]

Extending an interface with inheritance : Interface and Abstract Class*«*Language Basics*«*Java

I believe you need to implement the interface:

public class MyClass implements MyInterface

Also, use code tags when posting code, [code] to open [ /code]

[Tolls]

Where is Measureable?
Is it in a package?
How are you compiling this?