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| When run on my linux system |
Here's a simple script for calculating a car loan using java:
package calculateloan;
public class displayFrame extends javax.swing.JFrame {
//set up variables
public float interest;
public float price;
public float dpayment;
public int num_months;
public float results;
public float results1;
public double cubed;
/**
* Creates new form displayFrame
*/
public displayFrame() {
initComponents();
}
..........
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
// set default credit rating
interest = 0.15f;
//find out credit rating
if (jRadioButton1.isSelected()){
interest = 0.05f;
}
if (jRadioButton2.isSelected()){
interest = 0.10f;
}
if (jRadioButton3.isSelected()){
interest = 0.15f;
}
//find number of months
if (jComboBox1.getSelectedItem() == "5 years"){
num_months = 60;
}
if (jComboBox1.getSelectedItem() == "10 years"){
num_months = 120;
}
if (jTextField1.getText().isEmpty()){
//set default value for price
price = 15000.0f;
}
if (jTextField1.getText().length() != 0){
//set price from fields if not null
price = Integer.parseInt(jTextField1.getText());
}
if (jTextField2.getText().isEmpty()){
//set default down payment
dpayment = 0.0f;
}
if (jTextField2.getText().length() != 0){
//set down payment if field not null
dpayment = Integer.parseInt(jTextField2.getText());
}
//Print lines to test variable assignment
//System.out.println(price);
//System.out.println(dpayment);
//System.out.println(num_months);
//System.out.println(interest);
//at this point fields are set. we can calculate payment
//the calculation is (payment(rate/12))/(1-(1+rate/12)^-num_months)
//i broke it down into several steps
results = interest/12;
results = price * results;
results1 = interest/12;
results1 += 1;
num_months = -num_months;
cubed = java.lang.Math.pow(results1, num_months);
cubed = 1-cubed;
cubed = results/cubed;
//cubed is now a double with way too many decimal places
//let's do a bit of math to round it to the nearest tenth
//thanks to Obvius for this bit
int tempInteger;
cubed *= 100;
cubed += (double).5;
tempInteger = (int)cubed;
cubed = (double)tempInteger;
cubed /= 100;
jLabel7.setText("Results: " + cubed);
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
float[] anArray;
anArray = new float[3];
anArray[0] = 0.05f;
anArray[1] = 0.10f;
anArray[2] = 0.15f;
.........
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new displayFrame().setVisible(true);
}
});
}
// Variables declaration - do not modify
.......
}
Where ever you see "......." I've omitted some of the garbage netbeans adds. Obviously this is a snippet from a jframe project and the important bits are in tact. I set up a number of fields, dropdowns, etc, and a button that takes all of it to calculate the loan.
You should be able to do the same thing fairly easy using the design function within netbeans or a similar IDE.
-Newt
