Re: Applet Buttons Not Triggering

Hello,

I am having an issue getting the "Compute", "Reset", and "Close Window"
buttons to work in this calulator. The code compiles without issue in
TextPad. I had it working (calculating and displaying in the text
area), but I was getting a "uses or overrides a deprecated API" error
when compiling. So I changed, public boolean action(Event evt, Object
arg) to public boolean AWTEvent(Event evt, Object arg) in order to fix
it. Once I changed from action to AWT Event it stopped calulating/
displaying in the text box. I am using SDK 5.0.

Any ideas?

Thanks in advance!

import java.applet.Applet;
import java.awt.*;
public class test extends Applet
{ TextField balField;
    TextField intField;
    TextField nyrField;
    Button Calc;
    Button Reset;
    Button Close;
    TextArea msgArea;
        // Convert double to dollars and cents
        static String format(double dollars)
        { String numString = Double.toString(dollars);
            int dotpos = numString.indexOf('.');
            if (dotpos < 0) // Check if whole number
                return numString;
            // Check for excess fraction digits
            else if (dotpos < numString.length() - 2)
                return numString.substring(0, dotpos + 3); // `.'+ 2
digits
            else return numString + "0"; // Assume only 1 fraction
digit
    }
        public void init()
        { balField = new TextField("", 15);
            intField = new TextField("", 5);
            nyrField = new TextField("", 5);
            Calc = new Button("Compute");
            Reset = new Button("Reset");
            Close = new Button("Close Window");
            msgArea = new TextArea("", 25, 100);
            msgArea.setEditable(false);
            add(new Label("Enter principal"));
            add(balField);
            add(new Label("Enter annual interest rate"));
            add(intField);
            add(new Label("Enter number of years"));
            add(nyrField);
            add(Calc);
            add(Reset);
            add(Close);
            add(msgArea);
    }
        public boolean AWTEvent(Event evt, Object arg)
        { if (evt.target == Calc)

         {
                this.update();
                return true;
            }
            else if (evt.target == Reset)
            {
                balField.setText("");
                intField.setText("");
     nyrField.setText("");
     msgArea.setText("");
                return true;
            }
            else if (evt.target == Close)
            {
                 System.exit(0);

                return true;
            }
            else return false;
    }
        void update()
        { String balString = balField.getText();
            String intString = intField.getText();
            String nyrString = nyrField.getText();
            if (balString.trim().length() == 0)
                msgArea.setText("Principal amount missing");
            else if (intString.trim().length() == 0)
                msgArea.setText("Interest rate missing");
            else if (nyrString.trim().length() == 0)
                msgArea.setText("Number of years missing");
            else {
                double bal = new Double(balString).doubleValue();
                double intyr = new Double(intString).doubleValue() /
100.;
            short nyears = (short) new Integer(nyrString).intValue();
                        StringBuffer msg = new StringBuffer();
                    msg.append("\n\nprincipal=" + bal + " interest=" +
intyr + " years=" + nyears + "\n");
                    double intmo = intyr / 12.;
                    int npmts = nyears * 12;
                    double pmt = bal * (intmo / (1.- Math.pow(1.+
intmo,-npmts)));

msg.append("payment\ttotal\tinterest\tprincipal\tbalance\n");
                    msg.append("number\tpayment\tpayment\tpayment\n");
            msg.append("\t\t\t\t" + bal + "\n");
                        for (short mo = 1; mo <= npmts; ++mo) {
                        double prinpmt, intpmt = bal * intmo;
                        if (mo < npmts)
                            prinpmt = pmt - intpmt;
                        else prinpmt = bal;
                        bal -= prinpmt;
                        msg.append(mo + "\t" + format(intpmt + prinpmt)
                            + "\t" + format(intpmt)
                            + "\t" + format(prinpmt)
                            + "\t" + format(bal) + "\n\n\n");
                    }
                    msgArea.setText(msg.toString());
                }
            }
}