Rewrite Exercise to create a GUI, as shown in Figure Your program should let the

Question

Rewrite Exercise to create a GUI, as shown in Figure Your program should let the user enter the loan amount and loan period in the number of years from text fields, and it should display the monthly and total payments for each interest rate starting from 6 percent to 8 percent, with increments of one-eighth, in a text area. Write a program that lets the user enter the loan amount and loan period in number of years and displays the monthly and total payments for each interest rate staring from 5% to 8%, with an increment of 1/8. Here is a sample run. For the formula to compute monthly payment, see Listing, Compute Loan java. (b) The program displays a table for monthly payments and total payments on a given loan based on various interest rates.

Explanation / Answer

import javax.swing.JPanel;

import javax.swing.JTextField;

import javax.swing.JLabel;

import javax.swing.JButton;

import javax.swing.JTextArea;

import javax.swing.JScrollPane;

import java.awt.*;

import java.awt.event.*;

public class TestCalc{

     

    static JFrame window;

    static JPanel p;

    static JLabel label1, label2;

    static JTextField JTextField1, JTextField2;

    static JButton b;

    static JTextArea textArea;

    static JScrollPane scrollPane;

    static ButtonHandler handler;

     

    public static void main(String args[])

    {

        window = new JFrame(); // create window

        p = new JPanel();

         

         //Create the first label.

        label1 = new JLabel("Loan Amount", JLabel.LEFT);

        p.add( label1);

         

        //Set the position of its text, relative to its icon:

        label1.setVerticalTextPosition(JLabel.BOTTOM);

        label1.setHorizontalTextPosition(JLabel.LEFT);

         

        // construct textfield with 10 columns

        JTextField1 = new JTextField( 10 );

        p.add( JTextField1 );

         

        //Create the other labels.

        label2 = new JLabel("Number of Years");

        p.add(label2);

         

        // construct textfield with default text

        JTextField2 = new JTextField(3);

        p.add( JTextField2 );

         

        label1.setToolTipText("A label containing both image and text");

        label2.setToolTipText("A label containing only text");

         

        b = new JButton("Show Table" );

        p.add(b);

         

        textArea = new JTextArea(20, 40);

        textArea.setEditable(false);

        scrollPane = new JScrollPane(textArea);

        p.add( scrollPane );

         

        // create new ButtonHandler for button event handling

        handler = new ButtonHandler();

        b.addActionListener( handler );

         

        window.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );

        window.add(p);

        window.setSize( 520, 360); // set frame size

        window.setVisible( true ); // display frame

    } // end main

     

    // inner class for button event handling

    private static class ButtonHandler implements ActionListener

    {

        // handle button event

        public void actionPerformed( ActionEvent event )

        {

        String LoanAmount = JTextField1.getText();

        String NumberofYears = JTextField2.getText();

        double principle;

        int lifeofloan;

        String s = "Interest Rate     Monthly Payment                      Total Payment ";

         

        // this method will be called each time amount of money is paid

        private void incrementRate();

        { if(rate >= 3 && rate <= 6) rate += 0.125; // rate is instance variable

        }

         

        textArea.setText(s);

        }

    }  

} // end class TestCalc

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