How to combine integers with JTextFields?

Hello
I have 2 textFields and i want to add on each a integer
I also have 3 buttons 1for the "+"function 2 for the "-" function and 3 for the "="
function
How can i put integers and make the above functions using (JTextFields which are working with Strings as far i know)without throwing me exception thread String needed?
thanks

Why not just set the text to whatever number you want (or have the user do it by typing in the JTextField), then use getText() to retrieve the text and do your operations on it?
User enters stuff into textfields
User hits "enter" (or whatever)
Use JTextField.getText()
Use Integer.valueOf(String)
etcOr whatever floats your boat.

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import java.awt.Frame;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
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 pack();
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 long memUse1 = 0;
 long memUse2 = 0;
 long memUseTemp = 0;
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 String s = "" + m;
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}Message was edited by:
marcvomorc

Thank you for your answer,
In this sample the programm does not run out of memory. But when you look at the output you see, that in the first run (direct call) the memory ist freed immediately when tha panel is cleared but in the second run (from the Button) the memory usage is getting bigger and bigger. Wenn you change the number of components to 2000 (4000)
// Fill Panel with components
 for (int i = 0; i < 2000; i++) {
 // The Buttons seem to be released without any problem
//... ...and use the default memory settings (69mb heap) the programm runns out of memory.
I get the following output:
------------------ Direct Call (all is OK) -------------------
Memory Usage: 445504 -> 8121016 [ Used: 7675512 ] [ Freed: -445504]
Memory Usage: 617352 -> 8114336 [ Used: 7496984 ] [ Freed: 7503664]
Memory Usage: 810488 -> 8491768 [ Used: 7681280 ] [ Freed: 7303848]
Memory Usage: 943704 -> 8114976 [ Used: 7171272 ] [ Freed: 7548064]
Memory Usage: 836760 -> 8505072 [ Used: 7668312 ] [ Freed: 7278216]
Memory Usage: 978352 -> 8114784 [ Used: 7136432 ] [ Freed: 7526720]
Memory Usage: 835552 -> 8498288 [ Used: 7662736 ] [ Freed: 7279232]
Memory Usage: 977096 -> 8114312 [ Used: 7137216 ] [ Freed: 7521192]
Memory Usage: 835640 -> 8498376 [ Used: 7662736 ] [ Freed: 7278672]
Memory Usage: 977296 -> 8115000 [ Used: 7137704 ] [ Freed: 7521080]
Memory Usage: 835392 -> 8504872 [ Used: 7669480 ] [ Freed: 7279608]
Memory Usage: 976968 -> 8115192 [ Used: 7138224 ] [ Freed: 7527904]
Memory Usage: 836224 -> 8501624 [ Used: 7665400 ] [ Freed: 7278968]
Memory Usage: 977840 -> 8115120 [ Used: 7137280 ] [ Freed: 7523784]
Memory Usage: 835664 -> 8498256 [ Used: 7662592 ] [ Freed: 7279456]
Memory Usage: 976856 -> 8114384 [ Used: 7137528 ] [ Freed: 7521400]
Memory Usage: 835784 -> 8502848 [ Used: 7667064 ] [ Freed: 7278600]
Memory Usage: 977360 -> 8114592 [ Used: 7137232 ] [ Freed: 7525488]
Memory Usage: 835496 -> 8502720 [ Used: 7667224 ] [ Freed: 7279096]
Memory Usage: 976440 -> 8115128 [ Used: 7138688 ] [ Freed: 7526280]
------------ Call from Dialog (memory is not freed) -------------
Memory Usage: 866504 -> 8784320 [ Used: 7917816 ] [ Freed: -866504]
Memory Usage: 7480760 ->14631152 [ Used: 7150392 ] [ Freed: 1303560]
Memory Usage: 14245264 ->22127104 [ Used: 7881840 ] [ Freed: 385888]
Memory Usage: 19302896 ->27190744 [ Used: 7887848 ] [ Freed: 2824208]
Memory Usage: 27190744 ->35073944 [ Used: 7883200 ] [ Freed: 0]
Memory Usage: 31856624 ->39740176 [ Used: 7883552 ] [ Freed: 3217320]
Memory Usage: 39740176 ->47623040 [ Used: 7882864 ] [ Freed: 0]
Memory Usage: 44410480 ->52293864 [ Used: 7883384 ] [ Freed: 3212560]
Memory Usage: 52293864 ->58569304 [ Used: 6275440 ] [ Freed: 0]
Memory Usage: 58569304 ->64846400 [ Used: 6277096 ] [ Freed: 0]
Exception occurred during event dispatching:
java.lang.OutOfMemoryError: Java heap spacewhen I outcomment the adding of the JButtons the amount of freed memory is 0 in the second run. So my guess is, that there is a problem with freeing the memory for the JTextFields.
Memory Usage: 447832 -> 6509960 [ Used: 6062128 ] [ Freed: 6332768]
Memory Usage: 722776 -> 6785632 [ Used: 6062856 ] [ Freed: 5787184]
------------ Call from Dialog (memory is not freed) -------------
Memory Usage: 468880 -> 6770240 [ Used: 6301360 ] [ Freed: -468880]
Memory Usage: 6770240 ->13016264 [ Used: 6246024 ] [ Freed: 0]
Memory Usage: 13016264 ->19297080 [ Used: 6280816 ] [ Freed: 0]
Memory Usage: 19297080 ->25570152 [ Used: 6273072 ] [ Freed: 0]
Memory Usage: 25570152 ->31849160 [ Used: 6279008 ] [ Freed: 0]
Memory Usage: 31849160 ->38124368 [ Used: 6275208 ] [ Freed: 0]
Memory Usage: 38124368 ->44402072 [ Used: 6277704 ] [ Freed: 0]
Memory Usage: 44402072 ->50677928 [ Used: 6275856 ] [ Freed: 0]
Memory Usage: 50677928 ->56955880 [ Used: 6277952 ] [ Freed: 0]
Memory Usage: 56955880 ->63232152 [ Used: 6276272 ] [ Freed: 0]
Exception occurred during event dispatching:
java.lang.OutOfMemoryError: Java heap spaceAdditionally the JPanel I am using is not displayed on the screen. It stays invisible the whole time, but i cannot work around that, because the calculation is depending on the values being in components on the JPanel)
Marc

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