Thread: My program doesnt want to do its math point my errors out please

Hey guys i am making a money converter but i cant seem to see what is the problem for all the gates that i put in. Ii even put testers in. I got my problem but i dont know how to fix it. I am trying my best
Excuse my English its not the best
Here is my GUI

/*
 
package fase3;
 
/**
 *
 * @author Jigsaw
 */
public class Converter extends javax.swing.JFrame {
 
    /** Creates new form Converter */
    public Converter() {
        initComponents();
    }
 
    Driver dr = new Driver();
 
    double num =0;
    double numout = 0;
    double blah = 0;
 
    int EurotoSA = 0;
    int USAtoSA = 0;
    int SAtoEuro = 0;
    int EurotoUSA = 0;
    int USAtoEuro = 0;
    int SAtoUSA = 0;
 
( I removed all this coding cause i got this right nothing to do with what my problem is )
 
    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
 
        num = Integer.parseInt(jTextField1.getText());
        dr.getNum(num);
        numout = dr.setNum(blah);
        jLabel1.setText("Test 1 : " + dr.numD);
        jLabel2.setText("Test 2 : " + dr.SAtoEuro);
        jTextField2.setText ("" +numout);
 
    }
 
    private void SouthAfricanOUTActionPerformed(java.awt.event.ActionEvent evt) {
    }
 
    private void SouthAfricaINActionPerformed(java.awt.event.ActionEvent evt) {
 
       SouthAfricanOUT.setEnabled(false);
       EuropeOUT.setSelected(true);
 
        if(SouthAfricaIN.isSelected() && EuropeOUT.isSelected()){
            SAtoEuro = 1;
            SAtoUSA = 0;
            USAtoSA = 0;
            USAtoEuro = 0;
            EurotoUSA = 0;
            EurotoSA = 0;
 
            dr.gate1(SAtoEuro);
        }
               if(SouthAfricaIN.isSelected() && AmericaOUT.isSelected()){
            SAtoEuro = 0;
            SAtoUSA = 1;
            USAtoSA = 0;
            USAtoEuro = 0;
            EurotoUSA = 0;
            EurotoSA = 0;
            dr.gate1(SAtoEuro);
        }
 
    }
 
    private void AmericaINActionPerformed(java.awt.event.ActionEvent evt) {
 
    }
 
    private void EuropeINActionPerformed(java.awt.event.ActionEvent evt) {
 
    }
 
    private void AmericaOUTActionPerformed(java.awt.event.ActionEvent evt) {
 
    }
 
    private void EuropeOUTActionPerformed(java.awt.event.ActionEvent evt) {
 
    }
 
    private void jMenuItem1ActionPerformed(java.awt.event.ActionEvent evt) {
        new Help().setVisible(true);
    }
 
    private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
        System.exit(0);
    }
 
 
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
 
            public void run() {
                new Converter().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify
    private javax.swing.JRadioButton AmericaIN;
    private javax.swing.JRadioButton AmericaOUT;
    private javax.swing.JRadioButton EuropeIN;
    private javax.swing.JRadioButton EuropeOUT;
    private javax.swing.JRadioButton SouthAfricaIN;
    private javax.swing.JRadioButton SouthAfricanOUT;
    private javax.swing.ButtonGroup buttonGroup1;
    private javax.swing.ButtonGroup buttonGroup2;
    private javax.swing.ButtonGroup buttonGroup3;
    private javax.swing.JButton jButton1;
    private javax.swing.JButton jButton2;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JMenu jMenu1;
    private javax.swing.JMenuBar jMenuBar1;
    private javax.swing.JMenuItem jMenuItem1;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JTextField jTextField1;
    private javax.swing.JTextField jTextField2;
    // End of variables declaration
}

Here my driver class this is where the math goes.

package fase3;
 
/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
 
/**
 *
 * @author Jigsaw
 */
public class Driver {
 
    double num = 0;
    double numD = 0;
 
    double USAtoSAcur = 7.022;
    double USAtoEUROcur = 1.393;
    double SAtoEUROcur = 9.785;
 
    int EurotoSA = 0;
    int USAtoSA = 0;
    int SAtoEuro = 0;
    int EurotoUSA = 0;
    int USAtoEuro = 0;
    int SAtoUSA = 0;
 
    public double getNum(double inNum) {
        num = inNum;
        return num;
    }
    public int gate1(int StoE){
        SAtoEuro = StoE;
        return SAtoEuro;
    }
 
    public void Cu1(){
 
        if (SAtoEuro == 1){
            numD = num*SAtoEUROcur;
        }
    }
 
    public double  setNum(double numOUT) {
        numOUT = numD;
        return numOUT;
    }
 
 
 
}

Also another thing i made another frame that helps dummies like a tutorial. But if you press on the X top right it closes my whole program. How do i make it so that it only closes that frame and not the whole program?