Help with ArrayList...

Question

Hi Everyone:
I have this java program that I'm doing for school and I need a little bit of insite on how to do certain things. Basically what I did was I read a text file into the program. Once I tokenized the text(by line), I created another object(we'll call it Throttle) and passed the values that was tokenized, then I stored the object(Throttle) into ArrayList. Now, my question is how to I access the object(Throttle) from the ArrayList and use the object's(Throttle) methods? Here's the code that I have currently:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
public class Project1 extends JFrame
private JButton numOfThrottles, shiftThrottle, createThrottle, quit;
private JPanel panel;
private FileReader fr;
private BufferedReader br;
private FileWriter fw;
private int tempTop;
private int whatToShift;
private int tempPosition;
private ArrayList arrThrottles = new ArrayList();
private String line;
private Throttle myThrottle = null, daThrottle;
private StringTokenizer st;
public Project1()
super ("Throttles - by Joe Munoz");
panel = new JPanel();
setContentPane(panel);
panel.setLayout(null);
//**button stuff
numOfThrottles = new JButton("Number of Throttles");
shiftThrottle = new JButton("Shift a Throttle");
createThrottle = new JButton("Create New Throttle");
quit = new JButton("Quit");
panel.add(numOfThrottles);
panel.add(shiftThrottle);
panel.add(createThrottle);
panel.add(quit);
numOfThrottles.setBounds(5,7,150,25);
shiftThrottle.setBounds(5,30,150,25);
createThrottle.setBounds(5,50,150,25);
quit.setBounds(5,70,150,25);
numOfThrottles.addActionListener(new ClickDetector());
shiftThrottle.addActionListener(new ClickDetector());
createThrottle.addActionListener(new ClickDetector());
quit.addActionListener(new ClickDetector());
//window stuff
setSize(170,135);
show();
try
br = new BufferedReader(new FileReader("C:\\Storage.txt"));
catch (FileNotFoundException ex)
System.out.println ("File Not Found!");
try
line = br.readLine();
while (line != null)
st = new StringTokenizer(line, " ");
tempTop = Integer.parseInt(st.nextToken());
tempPosition = Integer.parseInt(st.nextToken());
myThrottle = new Throttle(tempTop, tempPosition);
arrThrottles.add(myThrottle);
line = br.readLine();
catch(Exception e)
System.out.println("IO Exception!!!");
System.exit(0);
private class ClickDetector implements ActionListener
public void actionPerformed(ActionEvent event)
try
if (event.getSource() == numOfThrottles)
JOptionPane.showMessageDialog(null, "Number of Throttles is..." + myThrottle.getNumOfThrottles());
if (event.getSource() == shiftThrottle)
String shift = JOptionPane.showInputDialog("Please Choose a Throttle from 0 to " + (arrThrottles.size() - 1));
whatToShift = Integer.parseInt(shift);
System.out.println ("whatToShift = " + whatToShift);
// Need help here
if (event.getSource() == createThrottle)
String inTop = JOptionPane.showInputDialog("Please Enter Top");
tempTop = Integer.parseInt(inTop);
String inPosition = JOptionPane.showInputDialog("Please Enter Position");
tempPosition = Integer.parseInt(inPosition);
myThrottle = new Throttle(tempTop, tempPosition);
arrThrottles.add(myThrottle);
JOptionPane.showMessageDialog(null, "The Throttle has been created");
if (event.getSource() == quit)
System.out.println ("you clicked quit");
catch (Exception e)
JOptionPane.showMessageDialog(null, "No Numbers inputted!");
Any insite/suggestions on what to do? Thank You.
Joe

Answer 1

Hi,
I have a question addition to this same question.
If you have an object and there are 10 different objects with in the object ..
tempTop = Integer.parseInt(st.nextToken());
tempPosition = Integer.parseInt(st.nextToken());
tempBottom = 10;
Is this how you access( from the same example) each object value
strTop= (Throttle)arrThrottles.get(i).tempTop;
strPos= (Throttle)arrThrottles.get(i).tempPosition;
strB= (Throttle)arrThrottles.get(i).tempBottom;
----I AM USING ARRAYS in a JAVABEAN
Class test {
public objectTEMP t[] = null;
public void initialize(val1,al2) {
     t = redim(t,10,false); //To set the length of the array to 10
public class T {
String s1 = null;
String s2 = null;
int i1 = null;
public void setS1(String inVal) {
          s1=inVal;
public void setS2(String inVal) {
     s2=inVal;
public void setI1(int inVal) {
     i1=inVal;
public String getS1() {
          return s1;
public String getS2() {
          return s2;
public String getI1() {
          return i1;
for (int i=0; i<t.length;i++) {
System.out.println("t"+i+t.getS1());
t.setS1("SOMESTRING");
System.out.println("t"+i+t.getS1());
Any use the setter and getter method from JSP to update or get the information.
I want to change this to ArrayList as they are fast and they have resizing ability.
How to I implement this in ARRAYLIST.
Thanks a bunch