Java calculator problem ???

[danielmessick]

Hello, I'm trying to fix my Java applet to have a fully functional calculator. I managed to create the buttons and have the +, -, /, *, =, and clear buttons WORKING. But, I cant seem to figure out how to get the decimal(.), squareroot, percent(%), reciprocal(1/x), and -/+ buttons working.. Can anyone help??

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

/*
 * JavaCalculator.java
 *
 * Created on Mar 12, 2010, 2:59:41 PM
 */

package jCalculator;

/**
 *
 * @author Owner
 */
public class JavaCalculator extends javax.swing.JFrame {

    private double total1 = 0.0;
    private double total2 = 0.0;
    private char math_operator;
    /** Creates new form JavaCalculator */
    public JavaCalculator() {
        initComponents();
    }

    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

        jPanel1 = new javax.swing.JPanel();
        btnSeven = new javax.swing.JButton();
        btnEight = new javax.swing.JButton();
        btnNine = new javax.swing.JButton();
        btnFour = new javax.swing.JButton();
        btnOne = new javax.swing.JButton();
        btnFive = new javax.swing.JButton();
        btnSix = new javax.swing.JButton();
        btnTwo = new javax.swing.JButton();
        btnThree = new javax.swing.JButton();
        btnZero = new javax.swing.JButton();
        btnDivide = new javax.swing.JButton();
        btnSquareroot = new javax.swing.JButton();
        btnMultiply = new javax.swing.JButton();
        btnPercentage = new javax.swing.JButton();
        btnMinus = new javax.swing.JButton();
        btnReciprocal = new javax.swing.JButton();
        btnPlus = new javax.swing.JButton();
        btnEquals = new javax.swing.JButton();
        btnZero1 = new javax.swing.JButton();
        btnZero2 = new javax.swing.JButton();
        txtDisplay = new javax.swing.JTextField();
        btnClear = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("Calculator");

        btnSeven.setFont(new java.awt.Font("Arial", 1, 12)); // NOI18N
        btnSeven.setForeground(new java.awt.Color(0, 153, 153));
        btnSeven.setText("7");
        btnSeven.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnSevenActionPerformed(evt);
            }
        });

        btnEight.setFont(new java.awt.Font("Arial", 1, 12)); // NOI18N
        btnEight.setForeground(new java.awt.Color(0, 153, 153));
        btnEight.setText("8");
        btnEight.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnEightActionPerformed(evt);
            }
        });

        btnNine.setFont(new java.awt.Font("Arial", 1, 12)); // NOI18N
        btnNine.setForeground(new java.awt.Color(0, 153, 153));
        btnNine.setText("9");
        btnNine.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnNineActionPerformed(evt);
            }
        });

        btnFour.setFont(new java.awt.Font("Arial", 1, 12)); // NOI18N
        btnFour.setForeground(new java.awt.Color(0, 153, 153));
        btnFour.setText("4");
        btnFour.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnFourActionPerformed(evt);
            }
        });

        btnOne.setFont(new java.awt.Font("Arial", 1, 12)); // NOI18N
        btnOne.setForeground(new java.awt.Color(0, 153, 153));
        btnOne.setText("1");
        btnOne.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnOneActionPerformed(evt);
            }
        });

        btnFive.setFont(new java.awt.Font("Arial", 1, 12)); // NOI18N
        btnFive.setForeground(new java.awt.Color(0, 153, 153));
        btnFive.setText("5");
        btnFive.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnFiveActionPerformed(evt);
            }
        });

        btnSix.setFont(new java.awt.Font("Arial", 1, 12)); // NOI18N
        btnSix.setForeground(new java.awt.Color(0, 153, 153));
        btnSix.setText("6");
        btnSix.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnSixActionPerformed(evt);
            }
        });

        btnTwo.setFont(new java.awt.Font("Arial", 1, 12)); // NOI18N
        btnTwo.setForeground(new java.awt.Color(0, 153, 153));
        btnTwo.setText("2");
        btnTwo.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnTwoActionPerformed(evt);
            }
        });

        btnThree.setFont(new java.awt.Font("Arial", 1, 12)); // NOI18N
        btnThree.setForeground(new java.awt.Color(0, 153, 153));
        btnThree.setText("3");
        btnThree.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnThreeActionPerformed(evt);
            }
        });

        btnZero.setFont(new java.awt.Font("Arial", 1, 12)); // NOI18N
        btnZero.setForeground(new java.awt.Color(0, 153, 153));
        btnZero.setText("0");
        btnZero.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnZeroActionPerformed(evt);
            }
        });

        btnDivide.setFont(new java.awt.Font("Arial", 1, 18)); // NOI18N
        btnDivide.setForeground(new java.awt.Color(204, 0, 0));
        btnDivide.setText("/");
        btnDivide.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnDivideActionPerformed(evt);
            }
        });

        btnSquareroot.setFont(new java.awt.Font("Arial", 0, 10)); // NOI18N
        btnSquareroot.setForeground(new java.awt.Color(0, 153, 153));
        btnSquareroot.setText("sqrt");
        btnSquareroot.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnSquarerootActionPerformed(evt);
            }
        });

        btnMultiply.setFont(new java.awt.Font("Arial", 1, 18)); // NOI18N
        btnMultiply.setForeground(new java.awt.Color(204, 0, 0));
        btnMultiply.setText("*");
        btnMultiply.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnMultiplyActionPerformed(evt);
            }
        });

        btnPercentage.setFont(new java.awt.Font("Arial", 1, 14)); // NOI18N
        btnPercentage.setForeground(new java.awt.Color(0, 153, 153));
        btnPercentage.setText("%");

        btnMinus.setFont(new java.awt.Font("Arial", 1, 14)); // NOI18N
        btnMinus.setForeground(new java.awt.Color(204, 0, 0));
        btnMinus.setText("-");
        btnMinus.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnMinusActionPerformed(evt);
            }
        });

        btnReciprocal.setFont(new java.awt.Font("Arial", 1, 11)); // NOI18N
        btnReciprocal.setForeground(new java.awt.Color(0, 153, 153));
        btnReciprocal.setText("1/x");
        btnReciprocal.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnReciprocalActionPerformed(evt);
            }
        });

        btnPlus.setFont(new java.awt.Font("Arial", 1, 14)); // NOI18N
        btnPlus.setForeground(new java.awt.Color(204, 0, 0));
        btnPlus.setText("+");
        btnPlus.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnPlusActionPerformed(evt);
            }
        });

        btnEquals.setFont(new java.awt.Font("Arial", 1, 14)); // NOI18N
        btnEquals.setForeground(new java.awt.Color(204, 0, 0));
        btnEquals.setText("=");
        btnEquals.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnEqualsActionPerformed(evt);
            }
        });

        btnZero1.setFont(new java.awt.Font("Arial", 1, 12)); // NOI18N
        btnZero1.setForeground(new java.awt.Color(0, 153, 153));
        btnZero1.setText("-/+");
        btnZero1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnZero1ActionPerformed(evt);
            }
        });

        btnZero2.setFont(new java.awt.Font("Arial", 1, 18)); // NOI18N
        btnZero2.setForeground(new java.awt.Color(0, 153, 153));
        btnZero2.setText(".");
        btnZero2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnZero2ActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addComponent(btnSeven, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(btnEight, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(btnNine, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(btnDivide, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(btnSquareroot, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE))
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addComponent(btnFour, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(btnFive, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(btnSix, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(btnMultiply, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(btnPercentage, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE))
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addComponent(btnOne, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(btnTwo, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addComponent(btnZero, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(btnZero1, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                    .addComponent(btnThree, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(btnZero2, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addComponent(btnPlus, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(btnEquals, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addComponent(btnMinus, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(btnReciprocal, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE))))
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                        .addComponent(btnSeven, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addComponent(btnEight, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addComponent(btnNine, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addComponent(btnDivide, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addComponent(btnSquareroot, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                        .addComponent(btnFour, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addComponent(btnFive, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addComponent(btnSix, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addComponent(btnMultiply, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addComponent(btnPercentage, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(btnOne, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(btnTwo, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(btnThree, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(btnMinus, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(btnReciprocal, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(btnZero, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(btnPlus, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(btnEquals, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(btnZero1, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(btnZero2, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addContainerGap())
        );

        txtDisplay.setEditable(false);
        txtDisplay.setFont(new java.awt.Font("Arial", 0, 14)); // NOI18N

        btnClear.setFont(new java.awt.Font("Arial", 1, 14)); // NOI18N
        btnClear.setForeground(new java.awt.Color(204, 0, 0));
        btnClear.setText("C");
        btnClear.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnClearActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                        .addContainerGap(176, Short.MAX_VALUE)
                        .addComponent(btnClear, javax.swing.GroupLayout.PREFERRED_SIZE, 108, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(layout.createSequentialGroup()
                        .addContainerGap()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(txtDisplay, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 274, Short.MAX_VALUE)
                            .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))))
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addComponent(txtDisplay, javax.swing.GroupLayout.PREFERRED_SIZE, 45, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(btnClear, javax.swing.GroupLayout.PREFERRED_SIZE, 45, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
        );

        pack();
    }// </editor-fold>

    private void getOperator(String btnText) {
        math_operator = btnText.charAt(0);
        total1 = total1 + Double.parseDouble(txtDisplay.getText());
        txtDisplay.setText("");
    }


    private void btnOneActionPerformed(java.awt.event.ActionEvent evt) {
    String btnOneText = txtDisplay.getText() + btnOne.getText();
    txtDisplay.setText(btnOneText);
    }

    private void btnTwoActionPerformed(java.awt.event.ActionEvent evt) {
    String btnTwoText = txtDisplay.getText() + btnTwo.getText();
    txtDisplay.setText(btnTwoText);
    }

    private void btnThreeActionPerformed(java.awt.event.ActionEvent evt) {
    String btnThreeText = txtDisplay.getText() + btnThree.getText();
    txtDisplay.setText(btnThreeText);
    }

    private void btnFourActionPerformed(java.awt.event.ActionEvent evt) {
    String btnFourText = txtDisplay.getText() + btnFour.getText();
    txtDisplay.setText(btnFourText);
    }

    private void btnFiveActionPerformed(java.awt.event.ActionEvent evt) {
    String btnFiveText = txtDisplay.getText() + btnFive.getText();
    txtDisplay.setText(btnFiveText);
    }

    private void btnSixActionPerformed(java.awt.event.ActionEvent evt) {
    String btnSixText = txtDisplay.getText() + btnSix.getText();
    txtDisplay.setText(btnSixText);
    }

    private void btnSevenActionPerformed(java.awt.event.ActionEvent evt) {
    String btnSevenText = txtDisplay.getText() + btnSeven.getText();
    txtDisplay.setText(btnSevenText);
    }

    private void btnEightActionPerformed(java.awt.event.ActionEvent evt) {
    String btnEightText = txtDisplay.getText() + btnEight.getText();
    txtDisplay.setText(btnEightText);
    }

    private void btnNineActionPerformed(java.awt.event.ActionEvent evt) {
    String btnNineText = txtDisplay.getText() + btnNine.getText();
    txtDisplay.setText(btnNineText);
    }

    private void btnZeroActionPerformed(java.awt.event.ActionEvent evt) {
    String btnZeroText = txtDisplay.getText() + btnZero.getText();
    txtDisplay.setText(btnZeroText);
    }

    private void btnClearActionPerformed(java.awt.event.ActionEvent evt) {
    total2 = 0;
txtDisplay.setText("");
    }

    private void btnEqualsActionPerformed(java.awt.event.ActionEvent evt) {

        switch ( math_operator ) {
            case '+':
                total2 = total1 + Double.parseDouble( txtDisplay.getText( ) ) ;
                break;
            case '-':
                total2 = total1 - Double.parseDouble(txtDisplay.getText( ) );
                break;
            case '/':
                total2 = total1 / Double.parseDouble(txtDisplay.getText( ) );
                break;
            case '*':
                total2 = total1 * Double.parseDouble(txtDisplay.getText( ) );
                break;

        }

        txtDisplay.setText( Double.toString(total2) );
        total1 = 0;    // TODO add your handling code here:
}

    private void btnPlusActionPerformed(java.awt.event.ActionEvent evt) {
        String button_text = btnPlus.getText();
        getOperator(button_text);
}

    private void btnMinusActionPerformed(java.awt.event.ActionEvent evt) {
        String button_text = btnMinus.getText();
        getOperator(button_text);
}

    private void btnMultiplyActionPerformed(java.awt.event.ActionEvent evt) {
        String button_text = btnMultiply.getText();
        getOperator(button_text);
}

    private void btnDivideActionPerformed(java.awt.event.ActionEvent evt) {
        String button_text = btnDivide.getText();
        getOperator(button_text);
}

    private void btnReciprocalActionPerformed(java.awt.event.ActionEvent evt) {

    float num,result;
    num=Float.parseFloat(btnReciprocal.getText());
    result = 1/num;
    btnReciprocal.setText(String.valueOf(result));

    }

    private void btnSquarerootActionPerformed(java.awt.event.ActionEvent evt) {
        float num,result;

    num=Float.parseFloat(btnSquareroot.getText());
    result=num*num;
    btnSquareroot.setText(String.valueOf(result));
    }

    private void btnZero1ActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
    }

    private void btnZero2ActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
    }

    /**
    * @param args the command line arguments
    */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new JavaCalculator().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify
    private javax.swing.JButton btnClear;
    private javax.swing.JButton btnDivide;
    private javax.swing.JButton btnEight;
    private javax.swing.JButton btnEquals;
    private javax.swing.JButton btnFive;
    private javax.swing.JButton btnFour;
    private javax.swing.JButton btnMinus;
    private javax.swing.JButton btnMultiply;
    private javax.swing.JButton btnNine;
    private javax.swing.JButton btnOne;
    private javax.swing.JButton btnPercentage;
    private javax.swing.JButton btnPlus;
    private javax.swing.JButton btnReciprocal;
    private javax.swing.JButton btnSeven;
    private javax.swing.JButton btnSix;
    private javax.swing.JButton btnSquareroot;
    private javax.swing.JButton btnThree;
    private javax.swing.JButton btnTwo;
    private javax.swing.JButton btnZero;
    private javax.swing.JButton btnZero1;
    private javax.swing.JButton btnZero2;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JTextField txtDisplay;
    // End of variables declaration

}

[Fubarable]

Cross-post: Java calculator problem ??? - Java answers

OP, please read up on the proper etiquette for notifying us about cross-posts here: JavaRanch - Be Forthright When Cross Posting To Other Sites

Your cooperation on this would be greatly appreciated (and the converse is true!).

Best of luck.

[Fubarable]

Also, myself, I would tend to use a single ActionListener for all the number and decimal buttons, and inside this actionlistener have logic that prevents decimal from being added more than once. I'd create another ActionListener for the basic math function keys, perhaps another for the more advanced math function keys, and another one for memory function keys.

Also, when you say things are "not working" you would help us a lot by going into as much detail as possible as to how the buttons are not working.

Also, again, please address the cross-post issue. A simple statement from you that you acknowledge this would suffice. Thanks.