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Converting a String to an Integer

4 replies on 1 page. Most recent reply: Nov 12, 2002 12:21 PM by Mike

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Mike

Posts: 4
Nickname: mikey65
Registered: Nov, 2002

Converting a String to an Integer

Posted: Nov 12, 2002 4:40 AM

Hey,

I have a basic ish knowledge of java and I am currently making a calculator using the Java programming language. I have thought to make a string variable for the number inputs so when the user keeps pressing '1' the string makes up a string of 1's. I see this as the best way.

The problem is that when I come to add the numbers up I see that I have to convert the string to an integer or other number based variable. I have tried the following method, it seems to work and puts the value in the integer but I can't seem to add the itegers up. I have stripped the code down a lot to make it a lot more simpler to understand.

Thanks for any help in advanced.

import java.awt.*;
import java.applet.Applet;
import java.awt.event.*;
public class calcv2 extends Applet{

String tempnumber="111";
int numstorea=1;
int numstoreb=2;

public void paint (Graphics g){

g.drawString("Calculator Version 1" ,275,20);

numstoreb = Integer.valueOf(tempnumber);

total = numstorea+numstoreb;

g.drawString("Total = " +total ,275,60);
}
}

Mike

Posts: 4
Nickname: mikey65
Registered: Nov, 2002

Re: Converting a String to an Integer

Posted: Nov 12, 2002 4:44 AM

Where I declared the integer variables at the top I have tried declaring them with and without pre-set values.

And also there was a 'total' variable declared but I accedentially took it out when stripping the code down.

Dante T. Salvador

Posts: 19
Nickname: anteng
Registered: Nov, 2002

Re: Converting a String to an Integer

Posted: Nov 12, 2002 8:59 AM

String strNumber = "14159";
Integer intNumber = Integer.valueOf(strNumber);

Mike

Posts: 4
Nickname: mikey65
Registered: Nov, 2002

Re: Converting a String to an Integer

Posted: Nov 12, 2002 11:36 AM

Thanks for that but the real problem is when this happens. Check the image below or copy and paste it into your borwser.

http://mysite.freeserve.com/mike65/java_pic1.jpg

Mike

Posts: 4
Nickname: mikey65
Registered: Nov, 2002

Re: Converting a String to an Integer

Posted: Nov 12, 2002 12:21 PM

It's ok I got it working. I had to use numstore = Integer.parseInt(strtempnum); and not the other one I used before.

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