A simple loan interest solver in Swing using Java programming language that I wrote I hope you will find my work useful.

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Program Listing

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package com.jakerpomperada.loan_interest_solver;

import javax.swing.*;  
import java.text.DecimalFormat;

/**
 *
 * @author Jacob Samuel
 */
public class Loan_Interest_Solver extends javax.swing.JFrame {

    /**
     * Creates new form Loan_Interest_Solver
     */
    public Loan_Interest_Solver() {
        initComponents();
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        Jlabel1 = new javax.swing.JLabel();
        principal_amount = new javax.swing.JTextField();
        Jlabel2 = new javax.swing.JLabel();
        percentage_rate = new javax.swing.JTextField();
        Jlabel3 = new javax.swing.JLabel();
        no_of_years = new javax.swing.JTextField();
        Jlabel4 = new javax.swing.JLabel();
        interest_rate = new javax.swing.JTextField();
        solve = new javax.swing.JButton();
        quit = new javax.swing.JButton();
        clear = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("Loan Interest Solver Using Swing in Java");

        Jlabel1.setFont(new java.awt.Font("Tahoma", 1, 12)); // NOI18N
        Jlabel1.setText("Enter Principal Amount ");

        Jlabel2.setFont(new java.awt.Font("Tahoma", 1, 12)); // NOI18N
        Jlabel2.setText("Enter Number of Years");

        Jlabel3.setFont(new java.awt.Font("Tahoma", 1, 12)); // NOI18N
        Jlabel3.setText("Enter Percentage Rate");

        Jlabel4.setFont(new java.awt.Font("Tahoma", 1, 12)); // NOI18N
        Jlabel4.setText("The Interest Rate");

        solve.setFont(new java.awt.Font("Tahoma", 1, 12)); // NOI18N
        solve.setText("Solve");
        solve.setToolTipText("Click here to solve the interest rate.");
        solve.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                solveActionPerformed(evt);
            }
        });

        quit.setFont(new java.awt.Font("Tahoma", 1, 12)); // NOI18N
        quit.setText("Quit");
        quit.setToolTipText("Click here to quit program.");
        quit.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                quitActionPerformed(evt);
            }
        });

        clear.setFont(new java.awt.Font("Tahoma", 1, 12)); // NOI18N
        clear.setText("Clear");
        clear.setToolTipText("Click here to clear the textbox.");
        clear.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                clearActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(21, 21, 21)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(solve, javax.swing.GroupLayout.PREFERRED_SIZE, 109, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 38, Short.MAX_VALUE)
                        .addComponent(clear, javax.swing.GroupLayout.PREFERRED_SIZE, 109, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addGap(32, 32, 32)
                        .addComponent(quit, javax.swing.GroupLayout.PREFERRED_SIZE, 109, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(layout.createSequentialGroup()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(Jlabel1)
                            .addComponent(Jlabel2)
                            .addComponent(Jlabel3)
                            .addComponent(Jlabel4))
                        .addGap(18, 18, 18)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(interest_rate, javax.swing.GroupLayout.PREFERRED_SIZE, 126, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(percentage_rate, javax.swing.GroupLayout.PREFERRED_SIZE, 126, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(no_of_years, javax.swing.GroupLayout.PREFERRED_SIZE, 126, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(principal_amount, javax.swing.GroupLayout.PREFERRED_SIZE, 126, javax.swing.GroupLayout.PREFERRED_SIZE))))
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(31, 31, 31)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(Jlabel1)
                    .addComponent(principal_amount, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(18, 18, 18)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(Jlabel2)
                    .addComponent(no_of_years, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(18, 18, 18)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(Jlabel3)
                    .addComponent(percentage_rate, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(28, 28, 28)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(Jlabel4)
                    .addComponent(interest_rate, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 32, Short.MAX_VALUE)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(solve, javax.swing.GroupLayout.PREFERRED_SIZE, 42, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(quit, javax.swing.GroupLayout.PREFERRED_SIZE, 42, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(clear, javax.swing.GroupLayout.PREFERRED_SIZE, 42, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(21, 21, 21))
        );

        pack();
    }// </editor-fold>                        

    private void solveActionPerformed(java.awt.event.ActionEvent evt) {                                      
        // TODO add your handling code here:
         DecimalFormat f = new DecimalFormat("##.00");
        
         if (evt.getSource().equals(solve)) {

           double principal_amt =  Double.parseDouble(principal_amount.getText());
        
           double no_of_yrs =  Double.parseDouble(no_of_years.getText());
           
           double percentage_rate_given = Double.parseDouble(percentage_rate.getText());
           
           double solve_interest = (principal_amt * no_of_yrs * percentage_rate_given) / 100;
          
           interest_rate.setText(String.valueOf(" PHP " + f.format(solve_interest)));
           interest_rate.setEditable(false); 
           
    }             
    }                                     

    private void clearActionPerformed(java.awt.event.ActionEvent evt) {                                      
        // TODO add your handling code here:
         if (evt.getSource().equals(clear)) {
        principal_amount.setText("");
        no_of_years.setText("");
        percentage_rate.setText("");
        interest_rate.setText("");
        principal_amount.requestFocus();
        }
    }                                     

    private void quitActionPerformed(java.awt.event.ActionEvent evt) {                                     
        // TODO add your handling code here:
        if (evt.getSource().equals(quit)) {
                             
   int confirmed = JOptionPane.showConfirmDialog(null, "Exit Program?","Quit Program",JOptionPane.YES_NO_OPTION);
    if(confirmed == JOptionPane.YES_OPTION)
    {
        dispose();
    }
} else {
            
     setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
       }     
    }                                    

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(Loan_Interest_Solver.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(Loan_Interest_Solver.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(Loan_Interest_Solver.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Loan_Interest_Solver.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Loan_Interest_Solver().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify                     
    private javax.swing.JLabel Jlabel1;
    private javax.swing.JLabel Jlabel2;
    private javax.swing.JLabel Jlabel3;
    private javax.swing.JLabel Jlabel4;
    private javax.swing.JButton clear;
    private javax.swing.JTextField interest_rate;
    private javax.swing.JTextField no_of_years;
    private javax.swing.JTextField percentage_rate;
    private javax.swing.JTextField principal_amount;
    private javax.swing.JButton quit;
    private javax.swing.JButton solve;
    // End of variables declaration                   
}

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