Value of previous variable becomes value of current variable

I got a problem with my code. As I try to compare two variables with different values by calling isEqual() method. But it gave me a result of true. Can someone spot the problem? My FloatingPoint Class

import io.*;

//Class FloatingPoint

public class FloatingPoint
{

    //Constant
    public static final double MINPRECISION = 0.00000001;

    //Variable
    private static double precision;

    //Default constructor
    public FloatingPoint()
    {
        precision = MINPRECISION;
    }

    //Unsure if need a alternatve
    //Alternative constructor
    public FloatingPoint(double value)
    {
        if( (value < 0.0) || (value > 1.0) )
        {
            throw new IllegalArgumentException("Invalid reliability!");
        }
        setPrecision(value);
    }

    //Copy Constructor
    public FloatingPoint(FloatingPoint num)
    {
        precision = num.getPrecision();
    }

    //getPrecision
    public double getPrecision()
    {
        return precision;
    }

    //isEqual
    public boolean isEqual(FloatingPoint num)
    {
        return (Math.abs(precision - num.getPrecision()) < MINPRECISION);
    }

    //setPrecision
    public static void setPrecision(double value)
    {
        precision = value;
    }
}

And this is my Main Class

import java.io.*;

public class TestFloatingPoint
{

    public static void main(String [] args)
    {

        FloatingPoint f1, f2;
        f1= new FloatingPoint(0.2);
        System.out.print(f1.toString());

        f2=new FloatingPoint(1.0);
        System.out.print(f2.toString());
        System.out.print(f1.toString());

        System.out.print(f1.isEqual(f2));
        System.exit(0);
    }
}