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Applet program that finds an inverse matrix

Applet program that accepts a 2x2 matrix and finds its inverse matrix if any. It seems easy, but I am having a problem getting it to work.

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Dear my friend
We are so happy that you have choosed Brainmass to get help.
We are so interested to help you and your friend to get what you need.
I have found this code in my files for you, which is completely usefull for any operaion on metices. I hope to be usefull.
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.text.NumberFormat;
import java.util.ArrayList;
import java.util.StringTokenizer;

import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;

public class MatrixCalculator {

private boolean DEBUG = true;

private boolean INFO = true;

private static int max = 100;

private static int decimals = 3;

private JLabel statusBar;

private JTextArea taA, taB, taC;

private int iDF = 0;

private int n = 4;

private static NumberFormat nf;

public Component createComponents() {

/* == MATRICES == */
taA = new JTextArea();
taB = new JTextArea();
taC = new JTextArea();

JPanel paneMs = new JPanel();
paneMs.setLayout(new BoxLayout(paneMs, BoxLayout.X_AXIS));
paneMs.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
paneMs.add(MatrixPane("Matrix A", taA));
paneMs.add(Box.createRigidArea(new Dimension(10, 0)));
paneMs.add(MatrixPane("Matrix B", taB));
paneMs.add(Box.createRigidArea(new Dimension(10, 0)));
paneMs.add(MatrixPane("Matrix C", taC));

JPanel paneBtn = new JPanel();
paneBtn.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
paneBtn.setLayout(new GridLayout(3, 3));
JButton btnApB = new JButton("A + B = C");
JButton btnAmB = new JButton("A * B = C");
JButton btnBmA = new JButton("B * A = C");
JButton btnAdjA = new JButton("adjoint(A) = C");
JButton btnInvA = new JButton("inverse(A) = C");
JButton btnInvB = new JButton("inverse(B) = C");
JButton btnTrnsA = new JButton("transpose(A) = C");
JButton btnDetA = new JButton("determ(A) = C");
JButton btnDetB = new JButton("determ(B) = C");

/* == ADD BUTTON Listeners == */
btnApB.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
try {
ReadInMatrix(taB)), taC);
} catch (Exception e) {
System.err.println("Error: " + e);

btnAmB.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
try {
ReadInMatrixNotSquare(taB)), taC);
} catch (Exception e) {
System.err.println("Error: " + e);

btnBmA.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
try {
ReadInMatrixNotSquare(taA)), taC);
} catch (Exception e) {
System.err.println("Error: " + e);

btnInvA.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
try {
DisplayMatrix(Inverse(ReadInMatrix(taA)), taC);
} catch (Exception e) {
System.err.println("Error: " + e);

btnInvB.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
try ...

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