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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My email address is jakerpomperada@gmail.com and jakerpomperada@yahoo.com
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Program Listing
Loan_Interest_Solver.java
/*
* 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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