Please help. I'm using Eclipse. How i'm may compiled java file to .JFX for using with JForex?

Hi,
it's not possible to compile a java file to the jfx using Eclipse.
It can be compiled in the JForex platform only.

Then please explain how compile next task.

I'm have main program - "MainBody.java"
Fragment of code:

    public void onTick(Instrument instrument, ITick tick) throws JFException {
                Pair pair;
            }

And have - "Pair.java"
Fragment of code:

package test;

public abstract class Pair {
   public abstract boolean tradeFlagBuy();
   public abstract boolean tradeFlagSell();
   public abstract int readme();
         }

How compile "MainBody.java" in JForex platform with including "Pair.java" class?

One of the ways how to solve this problem is to use inner class.
Please consider this example:

package jforex;
import com.dukascopy.api.*;
public class Strategy implements IStrategy {

   public void onStart(IContext context) throws JFException {
   }
   public void onAccount(IAccount account) throws JFException {
   }
   public void onMessage(IMessage message) throws JFException {
   }
   public void onStop() throws JFException {
   }
        public void onTick(Instrument instrument, ITick tick) throws JFException {
            Pair pair;
        }
        public void onBar(Instrument instrument, Period period, IBar askBar, IBar bidBar) throws JFException {
        }
    
    //create inner class
    abstract class Pair {
       public abstract boolean tradeFlagBuy();
       public abstract boolean tradeFlagSell();
       public abstract int readme();
    }
}

Here is more on inner classes https://java.sun.com/docs/books/tutorial/java/javaOO/nested.html

The another way is to put your classes in jar file. Then you could load them using annotation @Library
Here is sample: https://www.dukascopy.com/swiss/english/forex/jforex/forum/viewtopic.php?f=5&t=142
and some useful info https://www.dukascopy.com/swiss/english/forex/jforex/forum/viewtopic.php?f=5&t=477&p=1427&hilit=Library#p1427