Button wont trigger output in textarea

Question

I am doing something wrong here and cant figure out why my second set of buttons will not give output in my textarea. I would appreciate it if anyone could help shed some light on why its not working...
      public void actionPerformed(ActionEvent e)//creates the action event
      if(e.getSource() == calculateBtn)
      if (loanSlctBx.getSelectedItem().equals("7 years at 5.35%"))//array used to selcted term and APR bassed on the Combo Box
                                apr=b[0];//tells to store the 1st value to the varible
                                term=a[0];
                           else if (loanSlctBx.getSelectedItem().equals("15 years at 5.5%"))
                                apr=b[1];
                                term=a[1];//tells to store the 2nd value to the varible
                           else if (loanSlctBx.getSelectedItem().equals("30 years at 5.75%"))
                                apr=b[2];//tells to store the 3rd value to the varible
                                term=a[2];
                 // Makes all the calculation needed for the output
                amnt = Double.parseDouble(amntFld.getText());
                amntFld.setText(currencyComposition(amnt)); // Formats the value to use a US currencey composistion
                mTerm = term*12; //sets the mTerm variable
                mApr = (apr / 100) / 12; //sets the mApr with the monthly interest
                 pay = amnt * (mApr / (1 - Math.pow((1 + mApr), -mTerm)));//sets the pay varible with the results
                double newAmnt = amnt;//sets new variable for new loan amount
               //Loop to run the calulations thorughout the life of the loan
                for (int i=0; i<mTerm;i++)
                      if (i==36||i==72||i==108||i==144||i==180||i==216||i==252||i==288||i==326||i==360)
                           try
                                Thread.sleep(500);//sleep timer
                           catch (InterruptedException e1)
                      //Prints the output for the calculations in the JTextAera one line at a time
                      payFld.append(i+1 +"                        "+currencyComposition(pay)+"                       "+currencyComposition(newAmnt*mApr)+"                    "+currencyComposition(pay-(newAmnt*(mApr))) +"         "+currencyComposition(newAmnt)+"\n");
                      newAmnt -= pay-(newAmnt*(mApr));
      if(e.getSource() == calculateBtn2)
          if (e.getActionCommand().equals(calculateBtn2.getActionCommand()))
               String amnt2 = amntFld2.getText();
               String term2 = termFld2.getText();
               String apr2 = aprFld2.getText();
          else if (e.getActionCommand().equals(resetBtn.getActionCommand())) // Resets all fields
               amntFld2.setText(null);
               aprFld2.setText(null);
               termFld2.setText(null);
              payFld.setText(null);
            // Makes all the calculation needed for the output
            //amnt2 = Double.parseDouble(amntFld2.getText());
            //amntFld2.setText(currencyComposition(amnt2)); // Formats the value to use a US currencey composistion
            mTerm2 = term2*12; //sets the mTerm variable
            mApr2 = (apr2 / 100) / 12; //sets the mApr with the monthly interest
             pay = amnt2 * (mApr2 / (1 - Math.pow((1 + mApr2), -mTerm2)));//sets the pay varible with the results
            double newAmnt2 = amnt2;//sets new variable for new loan amount
          //Loop to run the calulations thorughout the life of the loan
            for (int i=0; i<mTerm2;i++)
                      if (i==36||i==72||i==108||i==144||i==180||i==216||i==252||i==288||i==326||i==360)
                           try
                                Thread.sleep(500);//sleep timer
                           catch (InterruptedException e1)
                      //Prints the output for the calculations in the JTextAera one line at a time
                      payFld.append(i+1 +"                        "+currencyComposition(pay)+"                       "+currencyComposition(newAmnt2*mApr2)+"                    "+currencyComposition(pay-(newAmnt2*(mApr2))) +"         "+currencyComposition(newAmnt2)+"\n");
                      newAmnt2 -= pay2-(newAmnt2*(mApr2));
                     // Formats the numeric values to readable currency
                     private String currencyComposition(double input) {
                             DecimalFormat df = new DecimalFormat("$###,###,###.00");
                             df.setMaximumFractionDigits(2);
                             String formattedString = df.format(input);
                             return formattedString;
      }

Answer 1

Does your code compile? I ask because in your "if (e.getActionCommand().equals(calculateBtn2.getActionCommand()))" block you declare a String variable amnt2 inside an if block but then use it outside the block to initialise newAmnt2.
This could work, I guess, if there were an instance variable amnt2 but that would be confusing. Actually if you are looking for light get rid of any variables of the form thingN, newThingN etc. Make the names descriptive: each variable descriptive of what it is a variable for.
To address your question (why the field doesn't change when you click the button): insert some System.out.println()s to check what code is actually being executed. Ie right at the start of actionPerformed(), again after the "if(e.getSource() == calculateBtn2)" etc. Basically everywhere you think the code should be getting to.
Also if "e.getSource() == calculateBtn2" is true won't the actionCommand of e and calculateBtn2 be the same? If so I don't really understand the intent of the code that checks them for equality.