button - Errors with java applet -

i trying write applet calculate average amount of 4 input boxes or clear fields depending on box clicked. think have right, there error somewhere causing following error statement appear: exception in thread "awt-eventqueue-0" java.lang.numberformatexception: input string: " 10" here's have far:

import java.applet.*; import java.awt.*; import java.awt.event.*;  public class blooddriveaverage extends applet implements actionlistener  {  public void init()   {    label title = new label("blood drive!");   setbackground(color.red);   label label1 = new label("department 1 amount: ");    textfield1 = new textfield(" ");    avg = new button("average");   clear = new button ("clear fields");   avg.addactionlistener(this);   clear.addactionlistener(this);    label label2 = new label("department 2 amount: ");   textfield2 = new textfield(" ");   label label3 = new label("department 3 amount: ");   textfield3 = new textfield(" ");   label label4 = new label("department 4 amount: ");   textfield4 = new textfield(" ");    add(title);   add(label1);   add(textfield1);   add(label2);   add(textfield2);   add(label3);   add(textfield3);   add(label4);   add(textfield4);   add(avg);   add(clear);   avg.setbackground(color.white);   clear.setbackground(color.orange);   }   public void actionperformed(actionevent e)    {    setlayout(new flowlayout());     double average = 0;    int[] myarray = new int[3];    myarray[0] = integer.parseint(textfield1.gettext());    myarray[1] = integer.parseint(textfield2.gettext());    myarray[2] = integer.parseint(textfield3.gettext());    myarray[3] = integer.parseint(textfield4.gettext());     if (e.getsource() == avg)    {   for(int = 0; < myarray.length; i++)    {     average += myarray[i];    }   average /=4;   label avgfield = new label("average is" + average);    }     else    {     textfield1.settext(" ");     textfield2.settext(" ");     textfield3.settext(" ");       textfield4.settext(" ");    }  }   textfield textfield1, textfield2, textfield3, textfield4;  button avg;  button clear; } 

read exception. thrown @ line:

myarray[0] = integer.parseint(textfield1.gettext()); 

the problem can't parse string number because has spaces (e.g. 10). need removed leading , trailing whitespace trim():

myarray[0] = integer.parseint(textfield1.gettext().trim()); 

that should fix numberformatexception, other errors remain.