Thread: Help with racecar applet?

Is there a way i could use my textfield text(for example: 25 is entered) to change the speeds for my pictures instead of making them all go the same speed? also a way to change the text into an int, because Integer.parseInt isnt working

this is the new error im getting:

java.lang.NumberFormatException: null
        at java.lang.Integer.parseInt(Integer.java:417)
        at java.lang.Integer.parseInt(Integer.java:499)
        at superclass.init(superclass.java:72)
        at sun.applet.AppletPanel.run(AppletPanel.java:424)
        at java.lang.Thread.run(Thread.java:619)

after adding this to get my x's and Timer to work right:

//in init:
one = new JTextField("",3);
text1 = one.getText();
Car1 = Integer.parseInt(text2);
 
two = new JTextField("", 3);
text2 = one.getText();
Car2 = Integer.parseInt(text2);
 
three = new JTextField("", 3);
text3 = one.getText();
Car3 = Integer.parseInt(text3);
 
four = new JTextField("", 3);
text4 = one.getText();
Car4 = Integer.parseInt(text4);
 
//what i have in ActionListener for timer:
 private class TimerHandler implements ActionListener
{
 
	public void actionPerformed(ActionEvent event)
 
{
 
	a++;
	a=(Car1 + (a));
	b++;
	b=(Car2 + (b));
	c++;
	c=(Car3 + (c));
	d++;
	d=(Car4 + (d));
	repaint();
 
 
 
}
 
 
}

that's what im wondering. the line 72 in my code is:
[CODE]
Car1 = Integer.parseInt(text1);

[\CODE]
it seems to not want to do anything with turning the text into an int.

i was trying to set the value of text1 up with the text of the JTextField, and was gonna use the text in an Integer.parseInt for the Car1. i never declared text1 as null or any of that.

would the:

	String text1 = one.getText();
	int Car1 = Integer.parseInt(text1);

be assigning it a value? i was giving it the text of the JTextField. the problem i guess is that until the app is initialized, then no value can be assigned because the user hasn't put them in yet. is there a way i could make it to where the code would have to wait until AFTER i initialized, entered number into the textbox, and clicked the button to get it to read it right?

i moved the code that i had up there to the TimerHandler:

//this is the code for my timer in the init:
timer1 = new Timer(50, new TimerHandler());
 
//this code is for my timer to work
private class TimerHandler implements ActionListener
{
 
	public void actionPerformed(ActionEvent event)
 
{
	text1 = one.getText();
	Car1 = Integer.parseInt(text1);
 
	text2 = one.getText();
	Car2 = Integer.parseInt(text2);
 
	text3 = one.getText();
	Car3 = Integer.parseInt(text3);
 
	text4 = one.getText();
	Car4 = Integer.parseInt(text4);
 
 
 
	a++;
	a=(Car1 + (a));
	b++;
	b=(Car2 + (b));
	c++;
	c=(Car3 + (c));
	d++;
	d=(Car4 + (d));
	repaint();
 
 
 
}
 
 
}

the timer doesn't start until the button is clicked, right? and yes i dont get the null error or any other exception now, the only problems im having is:
a) trying to get the images to start back at the beginning when the stop button is clicked and the the start button is clicked again, and
b) trying to separate the image from traveling together because no matter the speed i put in for each text field, they all go the same speed as Car1.

i did, and i got it working now. but do you know how to add music files to a java applet? i have the code and everything working now, thanks to your assistance and some critical thinking, but i need to do both a music file and want to try out a double buffer