Как нарисовать график по данным из массива2?

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.util.Arrays;
public class Main {
    int z[] = { 1, 4, 5, 6 };
    public static void main(String[] args) {
        int[] x = new int[10];
        double[] y = new double[10];
        for (int i = 0; i < x.length; i++) {
            x[i] = i;
            y[i] = i + P;
            System.out.print("x = " + x[i]);
            System.out.printf("%s %.3f %s", " y = ", +y[i], "\n");
        }
        System.out.println(Arrays.toString(y));
        new Draw(x, y);
    }
}
class Draw extends javax.swing.JFrame {
    private int[] x;
    private double[] y;
    private int[] yTrue;
    private Dimension size = new Dimension(500, 300); // рабочая область
    private Dimension startPointXoY = new Dimension(40, 250); // начало
                                                                // координат
    private int scale = 30; // масштаб
    public Draw(int[] x, double[] y) {
        this.x = x;
        this.y = y;
        yTrue = new int[x.length];
        reBuildArreys();
        initInterface();
    }
    @Override
    public void paint(Graphics g) {
        g.setColor(Color.BLACK);
        g.fillRect(0, 0, size.width, size.height);
        g.setColor(Color.WHITE);
        for (int i = 1; i <= x.length; i++) {
            g.drawString(String.valueOf(i), startPointXoY.width
                    + (startPointXoY.width - 10) * i, startPointXoY.height
                    + (startPointXoY.width - 25));
            g.drawString(String.valueOf(i), 25, startPointXoY.height
                    - (startPointXoY.width - 10) * i);
        }
        g.drawLine(startPointXoY.width, startPointXoY.width,
                startPointXoY.width, startPointXoY.height);
        g.drawLine(startPointXoY.width, startPointXoY.height, 400,
                startPointXoY.height);
        g.drawPolyline(x, yTrue, x.length);
    }
    private void initInterface() {
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setSize(size);
        setResizable(false);
        setTitle("График функции");
        setVisible(true);
    }
    private void reBuildArreys() {
        for (int i = 0; i < x.length; i++) {
            x[i] *= scale;
            x[i] += startPointXoY.width;
            y[i] *= scale;
            yTrue[i] = startPointXoY.height - ((int) y[i]);
        }
    }
    double P(double x, double[] coefficients) {
        double y = 0.0;
        double currentX = 1.0;
        for (int i = 0; i < coefficients.length; i++) {
            y += currentX * coefficients[i];
            currentX *= x;
        }
        return y;
    }
}