Question

***Please use java code for the question below***

1. Write a program that calculates the future value of a given investment at a given interest rate for a specified number of years. The formula for this calculation is:

value = investmentAmount * (1 + monthly interest rate)^years*12

Use text fields for the user to enter the numbers (Investment Amount, Number of Years, and Annual Interest). To get/load data from the textbox, (in this case doubles) use the following structure: (bold are identifiers you chose)

double incomingdata = Double.parseDouble(textboxName.getText());

Add a button called Calculate that will display the value (future amount) in a text field when clicked. You can use any pane you desire. The logic portion is easy (formula is given) – start with the layout and figuring out what is required (some labels, some text boxes, button, etc.). Draw it out on paper, figure out where everything goes – program (just the nodes) and adjust to get the layout you are happy with. Then, you can add the listener/handler – using implements and override. Also, generally, it is cleaner to import only what you need, vice doing a “*” (wildcard) –but, ensure you have imported the right stuff.  

Answer 1

File : Calculator.java

Note : Formula is modified because the provided one was not working.

import java.awt.event.*;
import javax.swing.*;
class Calculator extends JFrame implements ActionListener
{
// JTextField
static JTextField txtAmount, txtYears, txtRate, txtFamount ;
// JFrame
static JFrame f;   
// JButton
static JButton b;   
// label to display text
static JLabel l1,l2,l3,l4;
// default constructor
Calculator()
{
}
  
// main class
public static void main(String[] args)
{
// create a new frame to store text field and button
f = new JFrame("Calculator");   
// create a label to display text
l1 = new JLabel("Amount:");
       l2 = new JLabel("Number of Years:");
       l3 = new JLabel("Interest Rate:");  
       l4 = new JLabel("Future Amount:");
       l1.setBounds(100, 80, 100, 30);
       l2.setBounds(100, 120, 100, 30);
       l3.setBounds(100, 160, 100, 30);  
       l4.setBounds(100, 240, 100, 30);
// create a new button
b = new JButton("Calculate");
b.setBounds(200, 200, 100, 30);
// create a object of the text class
Calculator c = new Calculator();   
// addActionListener to button
b.addActionListener(c);   
// create a object of JTextField with 20 columns
txtAmount = new JTextField(20);
       txtYears = new JTextField(20);  
       txtRate = new JTextField(20);
       txtFamount = new JTextField(20);
       txtAmount.setBounds(200, 80, 100, 30);
       txtYears.setBounds(200, 120, 100, 30);
       txtRate.setBounds(200, 160, 100, 30);
       txtFamount.setBounds(200, 240, 100, 30);   
       f.setLayout(null);
f.add(txtAmount);
       f.add(txtYears);
       f.add(txtRate);
       f.add(txtFamount);   
       f.add(l1);
       f.add(l2);
       f.add(l3);
       f.add(l4);
f.add(b);
  
// set the size of frame
f.setSize(400, 400);   
f.show();
}
  
// if the button is pressed
public void actionPerformed(ActionEvent e)
{
String s = e.getActionCommand();
Double amount=0.0, years=0.0, rate=0.0, famount=0.0;
if (s.equals("Calculate"))
{
// set the text of the label to the text of the field
   amount=Double.parseDouble(txtAmount.getText());
   years=Double.parseDouble(txtYears.getText());
   rate=Double.parseDouble(txtRate.getText());
   famount=(amount*(1+((rate/100)*years)));
   famount= (double)(Math.round(famount*100.0)/100.0);// Round it to two decimal
   txtFamount.setText(""+famount);   
  
// set the text of field to blank
  
}
}
}

Screens: