Circuit.java

import java.util.Arrays;
import java.util.Scanner;

public class Circuit {

    public static final int ARRAY_SIZE = 10;

    private static double[] current     = new double[ARRAY_SIZE];
    private static double[] resistance  = new double[ARRAY_SIZE];
    private static double[] voltage     = new double[ARRAY_SIZE];

    public void inputCurrent(int index, Scanner scan) {
        double curr = 0.0;
        do {
            System.out.print("Enter current: ");
            curr = scan.nextDouble();
            if (curr<0) System.out.println("Error - negative current.");
        } while (curr<0);
        current[index] = curr;
    }

    public void inputResistance(int index, Scanner scan) {
        double res = 0.0;
        System.out.print("Enter resistance: ");
        res = scan.nextDouble();
        resistance[index] = res;
    }

    public void calcVoltage(int index) {
        voltage[index] = current[index] * resistance[index];
    }

    public void funcDisplay() {
        System.out.println("Current\tResistance\tVoltage\n");
        for (int i=0; i<ARRAY_SIZE; i++) {
            System.out.printf("%.1f\t%.1f\t\t%.1f%n", current[i], resistance[i], voltage[i]);
        }
    }

    public static void main(String[] args) {
        Circuit circuit = new Circuit();
        Scanner scan = new Scanner(System.in);
        for (int i=0; i<ARRAY_SIZE; i++) {
            circuit.inputCurrent(i, scan);
            circuit.inputResistance(i, scan);
            circuit.calcVoltage(i);
        } // for
        circuit.funcDisplay();
    } // main()

} // class Circuit