//package PS3a;
import javax.swing.*;
import java.util.*;     // For Vector

public class VectorTest {
    public static void main(String[] args) {
        
        Fluid[] substance= new Fluid[3];
        substance[0]= new Fluid("water", 1.0E3);
        substance[1]= new Fluid("air", 1.2);
        substance[2]= new Fluid("ethyl", 0.79E3);
        
        Vector network= new Vector();
        network.addElement(new Pipe("AB", 50.0, 0.5));
        network.addElement(new Pipe("BC", 15.0, 0.4));
        network.addElement(new Pipe("CD", 5.0, 0.3));
        Pipe.setRoughness(0.0001);
        
        for (int i=0; i < substance.length; i++)
            substance[i].printData();
        for (int j=0; j < network.size(); j++) {
            Pipe p= (Pipe) network.elementAt(j);
            p.printData();
        }
        Pipe.printStatic();
        //System.exit(0);                
    }
}

class Fluid {
    private String name;
    private double density;

    public Fluid(String n, double d) {
        name= n;
        density= d;
    }
    public void printData() {
        System.out.println("Fluid: " + name + ", density: " + density);
    }
}

class Pipe {
    private String name;
    private double length;
    private double diameter;
    private static double roughness;
    private final static double gravity= 9.8;

    public Pipe(String n, double l, double d) {
        name= n;
        length= l;
        diameter= d;
    }

    public void printData() {
        System.out.println("Pipe: " + name + ", length: " + length + ", diameter: " + diameter);
    }
    
    public static void setRoughness(double r) {
        roughness= r;
    }
    
    public static void printStatic() {
        System.out.println("Roughness: " + roughness + ", gravity: " + gravity);
    }
}