Need help with using ArrayLists with class methods

Question

**********************MAIN***************************
import java.util.ArrayList;
public class temp {
     public static void main (String[] args) {
          ArrayList <Shape> list = new ArrayList<Shape>();
          Point p = new Point(0,0);
          Circle c = new Circle(p, 3);
          list.add(c);
          list.add(p);
          for(int i = 1; i<=list.size(); i++){
               list.get(i).toString(); //Exception in thread "main" java.lang.IndexOutOfBoundsException:
//Why does this error message occur?
//Shouldn't list.get(i) return a Shape object?
**********************POINT CLASS*****************************
public class Point extends Shape{
     private double X, Y;
     Point(){
          X = Y = 0;
     Point(double x, double y){
          X = x;
          Y = y;
     public String toString(){
          String temp;
          temp = "(" + this.X + ", " + this.Y + ")";
          return temp;
**********************CIRCLE CLASS***************************
public class Circle extends Shape{
     Point center;
     double radius;
     Circle(){};
     Circle(Point p, double r){
          center = p;
          radius = r;
     public String toString(){
          String temp;
          temp = "C:( (" center.getPointX() ", " + center.getPointY() + "), " + this.radius + ")";
          return temp;
Where am I going wrong here??

Answer 1

arrays run from 0 to n-1 in Java.