Здравейте !
Предполагам , че съм го направил по грешен начин с 100 метода но просто не знам друг начин на решения ! 
Моля ако има по-лесен метод за решаване на задачата да ми помогнете . 

Това е условието на задача 4 :  
Write a program that reads three floating point numbers from the console and calculates their result with the following formulae :

Then calculate the difference between the average of the three numbers and the average of the two formulae.
Average ( a,b,c) - Average (f1,f2)

Това е кода , който аз написах :
 

import java.lang.Math;
import java.util.Scanner;

public class Problem4 {
    
    public static double first(double a){
            return a*a;
    }
    public static double second(double b){
        return b*b;
    }
    public static double third(double a,double b, double c){
        return (a+b+c);
    }
    public static double four(double c){
        return Math.sqrt(c) ;
    }
    public static double fifth(double a,double b){
        return first(a)+second(b) ;
    }
    public static double sixth(double a,double b){
        return first(a)-second(b) ;
    }
    public static double seventh(double a, double b, double c){
        return third(a,b,c)/four(c) ;
    }
    public static double eighth(double a, double b){
        return fifth(a,b)/sixth(a,b) ;
    }
    public static double f1(double a,double b, double c){
        return Math.pow(eighth(a,b),seventh(a,b,c));
    }
    
// Method for second form
    
    public static double first1(double a){
        return a*a;
    }
    public static double third3(double c){
        return c*c*c;
    }
    public static double fourth(double a,double b, double c){
        return first1(a)+second(b)-third3(c);
    }
    public static double fifth2(double a,double b){
        return a-b;
    }
    public static double f2(double a,double b,double c){
        return Math.pow(fourth(a,b,c),fifth2(a,b));
    }
    public static double resultF1F2(double a,double b,double c){
        return (f1(a,b,c)+f2(a,b,c))/2;
    }
    
    
    public static void main(String[] args) {
        
        Scanner scan = new Scanner(System.in);
        System.out.print("Enter a: ");
        double a = scan.nextDouble();
        System.out.print("Enter b: ");
        double b = scan.nextDouble();
        System.out.print("Enter c: ");
        double c = scan.nextDouble();
        System.out.println();
        System.out.print("Result f1:");
        System.out.println(f1(a, b, c));
        System.out.println();
        System.out.print("Result f2: ");
        System.out.println((f2(a,b,c)));
        System.out.println();
        
        System.out.print("The average of (a,b,c) is : ");
        double averageABC=(a+b+c)/3;
        System.out.println(averageABC);

        System.out.println();

        System.out.print("The average of f1 nad f2 : ");
        double averageF1F2=resultF1F2(a,b,c);
        System.out.println(averageF1F2);
    }
}