Java Jtable Not Updating External Values

Question

Im coding this math progam where the user buys and sells stocks and the table calculates the valuation based on price and amount of stocks the user has. (valuation = price*amt)

I used a dropdown box to allow users to choose which stock he would like to buy / sell but now i realised that since the program only enters 1 if statement at a time, the valuation for the other stocks do not get updated. (the price changes based on random number generated each day)

int selectedOption = jComboBox.getSelectedIndex();
        int newAMT = Integer.parseInt(buySellField.getText()); 
        System.out.print(selectedOption);

        if (selectedOption == 0){
          Object abcAmtPulled = jTable.getModel().getValueAt( 0, 2);
          int i = (int) abcAmtPulled;
          int finalABCAmt = newAMT + i;
          Object valuationABC = df.format(newABCPrice*finalABCAmt);
          jTable.getModel().setValueAt(finalABCAmt, 0, 2);
          jTable.getModel().setValueAt(valuationABC, 0, 3);
        }
        else if (selectedOption == 1){
          Object bmcAmtPulled = jTable.getModel().getValueAt( 1, 2);
          int i = (int) bmcAmtPulled;
          int finalBMCAmt = newAMT + i;
          Object valuationBMC = df.format(newBMCPrice*finalBMCAmt);
          jTable.getModel().setValueAt(finalBMCAmt, 1, 2);
          jTable.getModel().setValueAt(valuationBMC, 1, 3);
        }

I cant move the valuation calculation out of the if statements but i was wondering if there was a way to calculate the other valuations(in the other if statements) without manually getting value of all the prices and amount and multiplying in every if statement?

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Answer 1

Based on your tiny code fragment, and not a minimal reproducible example that we can copy into our IDE, compile, run, and test, you can try this:

    int selectedOption = jComboBox.getSelectedIndex();
    int newAMT = Integer.parseInt(buySellField.getText());
    System.out.print(selectedOption);

    if (selectedOption == 0) {
        Object abcAmtPulled = jTable.getModel().getValueAt(0, 2);
        int i = (int) abcAmtPulled;
        int finalABCAmt = newAMT + i;
        jTable.getModel().setValueAt(finalABCAmt, 0, 2);
    } else if (selectedOption == 1) {
        Object bmcAmtPulled = jTable.getModel().getValueAt(1, 2);
        int i = (int) bmcAmtPulled;
        int finalBMCAmt = newAMT + i;
        jTable.getModel().setValueAt(finalBMCAmt, 1, 2);
    }

    Object abcAmtPulled = jTable.getModel().getValueAt(0, 2);
    int i = (int) abcAmtPulled;
    Object valuationABC = df.format(newABCPrice * i);
    jTable.getModel().setValueAt(valuationABC, 0, 3);
    
    Object bmcAmtPulled = jTable.getModel().getValueAt(1, 2);
    i = (int) bmcAmtPulled;
    Object valuationBMC = df.format(newBMCPrice * i);
    jTable.getModel().setValueAt(valuationBMC, 1, 3);