Notes

//Name______________________________ Date_____________
import javax.swing.*;
import java.awt.*;
import java.io.*; //the File class
import java.util.*; //the Scanner class
import javax.swing.JOptionPane;
import java.util.Comparator;
public class DisplaySampleYard extends JPanel
{
private JLabel label;
private JTextField box1, box2, box3, box4, box5;
private Yard[] yard;
private int c=0;
private double total=0;
public DisplaySampleYard()
{
setLayout(new GridLayout(5, 2));

add(new JLabel("Last Name:", SwingConstants.RIGHT));
box1 = new JTextField("", 5);
box1.setHorizontalAlignment(SwingConstants.LEFT);
add(box1);

add(new JLabel("First Name:", SwingConstants.RIGHT));
box2 = new JTextField("", 5);
box2.setHorizontalAlignment(SwingConstants.LEFT);
add(box2);

add(new JLabel("Lawn Size:", SwingConstants.RIGHT));
box3 = new JTextField("", 5);
box3.setHorizontalAlignment(SwingConstants.LEFT);
add(box3);

add(new JLabel("total cost:", SwingConstants.RIGHT));
box4 = new JTextField("", 5);
box4.setHorizontalAlignment(SwingConstants.LEFT);
add(box4);

add(new JLabel("Running total:", SwingConstants.RIGHT));
box5 = new JTextField("", 5);
box5.setHorizontalAlignment(SwingConstants.LEFT);
add(box5);
String sr = JOptionPane.showInputDialog(null,"Which file?");
Scanner infile = null;
try{
infile = new Scanner(new File(sr));
}
catch(FileNotFoundException e)
{
JOptionPane.showMessageDialog(null,"The file could not be found.");
System.exit(0);
}
yard = new Yard[infile.nextInt()];
for(int x = 0; x<yard.length; x++)
{
String l = infile.next();
String f = infile.next();
int s = infile.nextInt();
if(s<=10000)
yard[x]=new CustomerSmallYard(l,f,s);
else if (s>10000 && s<=20000)
yard[x]=new CustomerMediumYard(l,f,s);
else
yard[x]=new CustomerLargeYard(l,f,s);
}
sort(yard);


}
public void next()
{
if(c<=yard.length-1)
{
double finalTotal=0;
box1.setText(yard[c].getLastName());
box2.setText(yard[c].getFirstName());
box3.setText(""+yard[c].getSize());
box4.setText(""+yard[c].getCost());
total+=yard[c].getCost();
box5.setText(""+total);
}
c++;

}
public static void sort(Yard[] array)
{
int maxPos;
for(int k = 0; k < array.length; k++)
{
maxPos = findMax(array, k);
swap(array, maxPos, k);
}
}
public static int findMax(Yard[] array, int upper) //what does "upper" do???
{
int max = upper;
for(int x = upper; x<array.length; x++)
if(array[x].compareTo(array[max])<1)
max = x;

return max;
}
public static void swap(Yard[] array, int a, int b)//what are "a" and "b" for???
{

Yard temp=array[a];
array[a]=array[b];
array[b]=temp;
/************************/
/* */
/* Your code goes here. */
/* */
/************************/
}


}