Errors dont know what is wrong!

Question

Errors dont know what is wrong!
import java.awt.*;
import javax.swing.*;
import java.awt.geom.*;
import java.awt.event.MouseListener;
import java.awt.event.*;
public class SquareShape extends Piece
{private Rectangle2D.Double _square1, _square2, _square3, _square4;
private int xLoc=80, yLoc=0, size=19, space=1;
private smallPiece [][] rectangle;
public SquareShape(smallPiece[][] rect)
{super(Color.red);
_square1 = new Rectangle2D.Double(xLoc,yLoc,size,size);
_square2 = new Rectangle2D.Double(xLoc,yLoc+size+space,size,size);
_square3 = new Rectangle2D.Double(xLoc+size+space,yLoc,size,size);
_square4 = new Rectangle2D.Double(xLoc+size+space,yLoc+size+space,size,size);
rectangle= rect;}
public void setXLocation(int x)
{_square1.setFrame(xLoc+x,yLoc,size,size);
_square2.setFrame(xLoc+x,yLoc+size+space,size,size);
_square3.setFrame(xLoc+size+space+x,yLoc,size,size);
_square4.setFrame(xLoc+size+space+x,yLoc+size+space,size,size);
xLoc=xLoc+x;}
public void setYLocation(int y)
{_square1.setFrame(xLoc,yLoc+y,size,size);
_square2.setFrame(xLoc,yLoc+size+space+y,size,size);
_square3.setFrame(xLoc+size+space,yLoc+y,size,size);
_square4.setFrame(xLoc+size+space,yLoc+size+space+y,size,size);
yLoc=yLoc+y;}
public boolean moveOneStep()
{if(_square2.getY()+size>=440||_square4.getY()>=440)
return false;
else
if(rectangle[21-((int)(_square2.getY()+1))/20][9-((int)(_square2.getX()+1))/20]!=null || rectangle[21-((int)(_square4.getY()+1))/20][9-((int)(_square4.getX()+1))/20]!=null)
{return false;}
else
{setYLocation(20);
return true;}}
public int[][] getLocs()
{int[][] locs= new int[4][2];
locs[0][0]= ((int)(_square1.getY()+1))/20;
locs[0][1]= ((int)(_square1.getX()+1))/20;
locs[1][0]= ((int)(_square2.getY()+1))/20;
locs[1][1]= ((int)(_square2.getX()+1))/20;
locs[2][0]= ((int)(_square3.getY()+1))/20;
locs[2][1]= ((int)(_square3.getX()+1))/20;
locs[3][0]= ((int)(_square4.getY()+1))/20;
locs[3][1]= ((int)(_square4.getX()+1))/20;
System.out.println(locs[0][0]+" "+locs[0][1]+" "+locs[1][0]+" "+locs[1][1]+" "+locs[2][0]+" "+locs[2][1]+ " "+locs[3][0]+" "+locs[3][1]);
return locs;}
public boolean contains(int x, int y)
{if(_square3.contains(x,y)||_square4.contains(x,y))
return true;
else
return false;}
public void fill(Graphics2D g2)
super.fill(g2);
g2.fill(_square1);
g2.fill(_square2);
g2.fill(_square3);
g2.fill(_square4);}
import java.awt.geom.*;
import java.awt.*;
import javax.swing.JPanel;
import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import java.awt.event.*;
public class TetrisPanel extends JPanel
{private Factory _pieceFact;
private Piece currentPiece;
private Timer _timer;
private int Interval =500;
private smallPiece [][] locationArray;
public TetrisPanel()
{setBackground(Color.white);
locationArray = new smallPiece[22][10];
_pieceFact = new Factory(locationArray);
currentPiece = _pieceFact.newPiece();
_timer = new Timer(Interval, new TimerListener());
_timer.start();
public void paintComponent(Graphics g)
{super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g;
currentPiece.fill(g2);
for(int row =0; row<22; row++)
for(int col =0; col<10; col++)
if(locationArray[row][col]!=null)
{locationArray[row][col].fill(g2);}}
public void createPiece()
{currentPiece =_pieceFact.newPiece();
repaint();}
public class TimerListener implements ActionListener{
public void actionPerformed(ActionEvent e)
if(currentPiece.moveOneStep()==true)
{repaint();
currentPiece.getLocs();}
else
{int[][]ar = currentPiece.getLocs();
for(int rows=0; rows<ar.length; rows++)
{locationArray[22-ar[rows][0]][10-ar[rows][1]] = new smallPiece(ar[rows][1]*20,ar[rows][0]*20, currentPiece.getColor());}
createPiece();
repaint();}
}the error
Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 22
     at TetrisPanel$TimerListener.actionPerformed(TetrisPanel.java:51)
     at javax.swing.Timer.fireActionPerformed(Timer.java:271)
     at javax.swing.Timer$DoPostEvent.run(Timer.java:201)
     at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
     at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
     at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
     at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 22
     at SquareShape.moveOneStep(SquareShape.java:38)
     at TetrisPanel$TimerListener.actionPerformed(TetrisPanel.java:45)
     at javax.swing.Timer.fireActionPerformed(Timer.java:271)
     at javax.swing.Timer$DoPostEvent.run(Timer.java:201)
     at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
     at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
     at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
     at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)

Answer 1

Errors dont know what is wrong!You read the stack trace from the top down, looking out for the first line that refers to your code.
java.lang.ArrayIndexOutOfBoundsException: 22This means that you are using something as an array index (some variable, perhaps) and it has a value of 22, but the array itself is not that big.
at TetrisPanel$TimerListener.actionPerformed(TetrisPanel.java:51This tells you exactly where the bad array access is taking place. Only you know which line 51 is - and it's good form to tell the rest of us when you post - but, at a wild guess, I'd say it was that line within the for loop that assigns new values to the locationArray.
Use System.out.println() to check the values of the variables (or expressions) you use to access the array. Also check the length of the various arrays involved.
(If I were you, I'd consider using a bit more indentation in your code. Especially where constructs are nested.)