img
fields are completed. */
public void actionPerformed(ActionEvent ae) {
double result = 0.0;
String
regWDStr = regWDText.getText();
String
periodStr = periodText.getText();
String
rateStr = rateText.getText();
String
numWDStr = numWDText.getText();
try {
if(regWDStr.length() != 0 &&
periodStr.length() != 0 &&
rateStr.length() != 0 &&
numWDStr.length() != 0) {
regWDAmount = Double.parseDouble(regWDStr);
numYears = Double.parseDouble(periodStr);
rateOfRet = Double.parseDouble(rateStr) / 100;
numPerYear = Integer.parseInt(numWDStr);
result = compute();
initialText.setText(nf.format(result));
}
showStatus(""); // erase any previous error message
} catch (NumberFormatException exc) {
showStatus("Invalid Data");
initialText.setText("");
}
}
// Compute the required initial investment.
double compute() {
double b, e;
double t1, t2;
t1 = (regWDAmount * numPerYear) / rateOfRet;
b = (1 + rateOfRet/numPerYear);
e = numPerYear * numYears;
t2 = 1 - (1 / Math.pow(b, e));
return t1 * t2;
}
}
Finding the Maximum Annuity for a Given Investment
Another annuity calculation computes the maximum annuity (in terms of a regular withdrawal)
available from a given investment over a specified period of time. For example, if you have
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