Пример кода от 28.02 для группы К9

package arrays;

import java.util.Arrays;

/**
 *
 * @author Eugeny
 */
public class Main {

    private double[] x = new double[5];
    private double[] y = {2.4, 5.9, 1.3, -5};
    private double[] z = new double[]{2.5, 3.1, -2.4};

    public double getX(int i) {
        return x[i];
    }

    public void setX(double[] x) {
        this.x = x;
    }

    public void run() {
        // можно сделать и так
//        y = new double[]{3.5, 4};
        for (int i = 0; i < y.length; i++) {
//            System.out.println("z=" + z[i]);
            System.out.println("y=" + y[i]);
//            System.out.println("z=" + z[i]);
        }
        Arrays.sort(y);
        for (double d : y) {
            System.out.println("y="+d);
        }
        double s = 0;
        for (double d : y) {
            s+=d;
        }
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        new Main().run();
    }
}