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

  1. #1
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    Question 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;
            }
        }
    }


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Array Out Of Index Exception, Not Sure Why It's Occurring.

    The max index to an array is the length-1. Indexes range from 0 to the length-1
    If you don't understand my answer, don't ignore it, ask a question.

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

    Quote Originally Posted by Norm View Post
    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?

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

    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 )
    Make sure the code on line 94 does not use an index that is past the end of the list.
    If you don't understand my answer, don't ignore it, ask a question.

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

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

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