Question

Question 1 (Marks: 50 Develop a Java GUI application that will produce an investment report based on various criteria, such as investment amount, investment type and term. On the form create two text fields, one to capture the customer name and (10) Q.1.1 another to capture the amount to invest. Also create a combo box for the user to select the investment type which will be moderate or aggressive. Finally add three radio buttons for the user to select the term which is five years, 10 years or 15 years Q.1.2 You are also required to create a menu system which will allow the user to exit (15) the application under the file menu and calculate and clear under the tools menu. The layout of the form is left to your discretion. Marks will be allocated to the presentation and effectiveness of the layout, but the following layout is displayed for your convenience. Investment Calculator X File Tools Jeff Jones Customer Name: Enter Amount 5000 Select Type: Aggressive O 5 Years Select Term O 10 Years O 15 Years

Answer 1

InvestmentCalculator.java

//import packages for GUI awt/swing and events
import java.awt.*;
import java.awt.event.*;
import java.util.Vector;
import javax.swing.*;

/*
InvestmentPanel class inherits from JPanel
add all components on it by providing
getter/setter methods for componet interface
*/
class InvestmentPanel extends JPanel
{
    //declare textfields for customer name & amount
    private final JTextField customerName;
    private final JTextField amount;
    //declare combobox for type of investment (moderate/aggressive)
    private final JComboBox type;
    //declare radio button for investment years
    private final JRadioButton term_5years;
    private final JRadioButton term_10years;
    private final JRadioButton term_15years;
    //radio button group to hold each above radio buttons
    private final ButtonGroup group;
    //vector types for adding investment types
    private final Vector<Object> types = new Vector<>();
  
    //constructor
    public InvestmentPanel(){
        //create custome name & amount textfields
        customerName = new JTextField(20);
        amount = new JTextField(20);
        //add Moderate & Aggressive string to types vector object
        types.add("Moderate                         ");
        types.add("Aggressive                         ");
        //create combo box with types
        type = new JComboBox(types);
        //create radio buttons
        term_5years = new JRadioButton("5 Years");
        term_10years = new JRadioButton("10 Years");
        term_15years = new JRadioButton("15 Years");
        group = new ButtonGroup();
      
    }
  
    //returns this object by adding each created components
    //to this panel object
    public InvestmentPanel createInvestmentPanel(){
        //set default 5 years radio button selected to true
        term_5years.setSelected(true);
        //add each radio button to button group
        group.add(term_5years);
        group.add(term_10years);
        group.add(term_15years);
      
        //set flow layout for all components on panel
        setLayout(new FlowLayout(10));
        //add customer name text field with label
        add(new JLabel(" Customer Name: "));
        add(customerName);
        //add amount text field with label
        add(new JLabel(" Enter Amount:    "));
        add(amount);
        //add combobox with label
        add(new JLabel(" Select Type:        "));
        add(type);
        //add radio button group with label
        add(new JLabel(" Select Term:      "));
        add(term_5years);
        add(term_10years);
        add(term_15years);
        return this;
    }
  
    //getter methods
    public String getCustomerName(){
        return customerName.getText();
    }
  
    public String getAmount(){
        return amount.getText();
    }
  
    public String getType(){
        return type.getSelectedItem().toString().trim();
    }
  
    public int getTerm(){
        if(term_5years.isSelected())
            return 5;
        else if(term_10years.isSelected())
            return 10;
        else
            return 15;
    }
  
    //setter methods
    public void setCustomerName(String s){
        customerName.setText(s);
    }
  
    public void setAmount(String s){
        amount.setText(s);
    }
  
    public void setType(int i){
        type.setSelectedIndex(i);
    }
}

/*
InvestmentFrame class inherits from JFrame
add InvestmentPanel on it
*/
class InvestmentFrame extends JFrame
{
    //declare menubar and its menus File, Tools
    private final JMenuBar menuBar;
    private final JMenu fileMenu;
    private final JMenu toolsMenu;
    //declare menu items File->Exit, Tools->Calculate, Tools->Clear
    private final JMenuItem file_exitMenuItem;
    private final JMenuItem tools_calculateMenuItem;
    private final JMenuItem tools_clearMenuItem;
    //declare InvestmentPanel object
    private InvestmentPanel investmentPanel;
  
    //constructor
    public InvestmentFrame(){
        //initialize all above declared objects
        menuBar = new JMenuBar();
        fileMenu = new JMenu("File");
        toolsMenu = new JMenu("Tools");
        file_exitMenuItem = new JMenuItem("Exit");
        tools_calculateMenuItem = new JMenuItem("Calculate");
        tools_clearMenuItem = new JMenuItem("Clear");
      
        //add each menu item to specific menu
        fileMenu.add(file_exitMenuItem);
      
        toolsMenu.add(tools_calculateMenuItem);
        toolsMenu.add(tools_clearMenuItem);
      
        menuBar.add(fileMenu);
        menuBar.add(toolsMenu);
      
    }
  
    public void showFrame(){
        //create investment panel object
        investmentPanel = new InvestmentPanel();
        //create MenuItemsAction object by passing investmentPanel object to it
        MenuItemsAction act = new MenuItemsAction(investmentPanel);
        //add action listener to each menu item
        file_exitMenuItem.addActionListener(act);
        tools_calculateMenuItem.addActionListener(act);
        tools_clearMenuItem.addActionListener(act);
      
        //set frame properties
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setJMenuBar(menuBar);
        getContentPane().add(investmentPanel.createInvestmentPanel());
        setTitle("Investment Calculator");
        setSize(420, 200);
        setLocation(300, 200);
        setVisible(true);
    }
}

//action class that inherits ActionListener
class MenuItemsAction implements ActionListener
{
    private InvestmentPanel investmentPanel;
  
    //get the InvestmentPanel object for accessing its
    //properties like customer name, amount
    public MenuItemsAction(InvestmentPanel panel){
        investmentPanel = panel;
    }
  
    @Override
    public void actionPerformed(ActionEvent evt){
        if(evt.getSource() instanceof JMenuItem){
            //perform action according to the menu item selected
            String item = evt.getActionCommand().trim();
            switch(item){
                //File->Exit menu item action
                case "Exit" : System.exit(0); break;
                //Tools->Calculate menu item action
                case "Calculate" :
                    calculate();
                    break;
                //Tools->Clear menu item action
                case "Clear" :
                    clear();
                    break;
            }
        }
    }
  
    //calculate investment amount
    private void calculate(){
        //get amount from customer name text field
        double amount = Double.parseDouble(investmentPanel.getAmount());
        //get intereset rate from type
        double interest = 10.0;
        String type = investmentPanel.getType();
        if(type.equals("Moderate"))
            interest = 10.0;
        else if(type.equals("Aggressive"))
            interest = 15.0;
      
        //get investment years
        int years = investmentPanel.getTerm();
      
        double investment = amount * Math.pow(1 + (interest / 12), 12 * years);
        double compound_interest = investment - amount;
      
        String str = "INVESTMENT REPORT\n"
                + "\nCUSTOMER NAME: " + investmentPanel.getCustomerName()
                + "\nORIGINAL AMOUNT: " + investmentPanel.getAmount()
                + "\nYEARS Invested: " + years
                + "\nFINAL AMOUNT: R " + investment;
      
        //show message box with all the details
        JOptionPane.showMessageDialog(null, str);
    }
  
    //clear all text fields
    private void clear(){
        investmentPanel.setCustomerName("");
        investmentPanel.setAmount("");
        investmentPanel.setType(0);
    }
}

//main class
public class InvestmentCalculator
{
    public static void main(String[] args) {
        //create investment frame and show frame
        InvestmentFrame invf = new InvestmentFrame();
        invf.showFrame();
    }
  
}

Answer 2