Thread: Array Out Of Index Exception, Not Sure Why It's Occurring.

My code (below) occasionally decides to return this error:

Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 2, Size: 2
at java.util.ArrayList.rangeCheck(ArrayList.java:604)
at java.util.ArrayList.get(ArrayList.java:382)
at com.github.bewd.yugioh.main.Main.main(Main.java:94 )

Can anyone help me?

import javax.swing.JFrame;
import javax.swing.JPanel;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.logging.Logger;
import javax.imageio.ImageIO;
//import javax.swing.JLabel;
import java.util.ArrayList;
import java.util.Random;
import java.util.Scanner;
import java.math.*;
 
@SuppressWarnings("serial")
public class Main extends JPanel{
 
    private static final int appversionmajor = 0;
    private static final double appversionminor = 1.3;
    private static final String appname = "Yu-Gi-Oh!: Trading Card Game";
    private static final String appstage = "Alpha";
    private static final String versionstring = appname + " (" + appversionmajor + "." + appversionminor + " " + appstage + ")";
    private BufferedImage sdk1, sdk2, sdk3, sdk4, sdk5, sdk6, sdk7, sdk8, sdk9, sdk10, bc;
 
    public Main() {
 
        try {                
            sdk1 = ImageIO.read(getClass().getResourceAsStream("img\\cards\\sdk001.png"));
            sdk2 = ImageIO.read(getClass().getResourceAsStream("img\\cards\\sdk002.png"));
            sdk3 = ImageIO.read(getClass().getResourceAsStream("img\\cards\\sdk003.png"));
            sdk4 = ImageIO.read(getClass().getResourceAsStream("img\\cards\\sdk004.png"));
            sdk5 = ImageIO.read(getClass().getResourceAsStream("img\\cards\\sdk005.png"));
        } 
        catch (IOException e) {
            Logger LogErr = Logger.getLogger(Main.class.getName());
            System.err.println(appname + " " + "Caught IOException: " + e.getMessage());
       }
    }
 
    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        g.drawImage(sdk1, 0, 0, Card.cardwidth / 5, Card.cardheight / 5, null);
        g.drawImage(sdk2, Card.cardlong, 0, Card.cardwidth / 5, Card.cardheight / 5, null);
        g.drawImage(sdk3, Card.cardlong * 2, 0, Card.cardwidth / 5, Card.cardheight / 5, null);
        g.drawImage(sdk4, Card.cardlong * 3, 0, Card.cardwidth / 5, Card.cardheight / 5, null);
        g.drawImage(sdk5, Card.cardlong * 4, 0, Card.cardwidth / 5, Card.cardheight / 5, null);
    }
 
	public static void main(String[] args) {
            JFrame frame = new JFrame(versionstring);
            frame.add(new Main());
            frame.setSize(1020, 680);
            frame.setVisible(false);
            frame.setResizable(false);
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setExtendedState(JFrame.MAXIMIZED_BOTH);
 
            ArrayList<MonsterCard> deck1 = new ArrayList(50);
            ArrayList<MonsterCard> deck2 = new ArrayList(50);
            deck1.add(CardListKaiba.BlueEyesWhiteDragon);
            deck1.add(CardListKaiba.HitotsuMeGiant);
            deck1.add(CardListKaiba.RyuKishin);
            deck1.add(CardListKaiba.TheWickedWormBeast);
            deck1.add(CardListKaiba.BattleOx);
            /*deck1.add(CardListKaiba.KoumoriDragon);
            deck1.add(CardListKaiba.JudgeMan);
            deck1.add(CardListKaiba.RogueDoll);
            deck1.add(CardListKaiba.Kojikocy);
            deck1.add(CardListKaiba.Uraby); */
            ArrayList<MonsterCard> monsterfield1 = new ArrayList(5);
            ArrayList<MonsterCard> monsterfield2 = new ArrayList(5);
            ArrayList<SpellCard> magicfield1 = new ArrayList(5);
            ArrayList<SpellCard> magicfield2 = new ArrayList(5);
            ArrayList<MonsterCard> hand1 = new ArrayList(5);
            ArrayList<MonsterCard> hand2 = new ArrayList(5);
            int lifepoints1 = 2000;
            int lifepoints2 = 2000;
            Random r = new Random();
 
            System.out.println("Drawing Hand from Deck...");
            int randomPos1 = r.nextInt(deck1.size());
                hand1.add(deck1.get(randomPos1));
                deck1.remove(randomPos1);
                hand1.add(deck1.get(randomPos1));
                deck1.remove(randomPos1);
                hand1.add(deck1.get(randomPos1));
                deck1.remove(randomPos1);
                hand1.add(deck1.get(randomPos1));
                deck1.remove(randomPos1);
 
            while(lifepoints1 > 0|| lifepoints2 > 0){
                hand1.add(deck1.get(randomPos1));
                deck1.remove(randomPos1);
                System.out.println("Initiating Draw Phase:");
                System.out.println("Your hand consists of:");
                for(int i = 0; i <hand1.size(); i++){
                    System.out.println(hand1.get(i).toString() + "");
                }
 
 
            System.out.println("Initiating Main Phase 1:");
            System.out.println("Which monster would you like to summon?");
            Scanner monSummon = new Scanner(System.in);
            int whichMonsterPOS1 = monSummon.nextInt();
            monsterfield1.add(hand1.get(whichMonsterPOS1));
            hand1.remove(whichMonsterPOS1);
            for(int i = 0; i<monsterfield1.size(); i++){
                System.out.println(monsterfield1.get(i).toString() + " has been summoned");
            }   
 
            frame.setVisible(false);
            System.out.println("Your side of the Field contains: " + monsterfield1);
            break;
        }
    }
}

Originally Posted by Norm

The max index to an array is the length-1. Indexes range from 0 to the length-1

How would I go about fixing this?

Sorted it now by declaring an int with a for loop further up; thanks.