java - Input to an applet -

cannot understand use of :public boolean action(event event, object object) { repaint(); return true ; } }. making return sum of 2 numbers. if don't use.

public boolean action (event event, object object) {  repaint();  return true ;  

i can enter number in text field won't generate sum. why?

}}  import java.awt.*;  import java.applet .*;  public class user extends applet{  textfield text1,text2;  public void init(){  text1=new textfield(8);  text2=new textfield(8);  add(text1);  add(text2);  text1.settext("0");  text2.settext("0");}  public void paint(graphics g){  int x =0,y=0,z=0;  string s1,s2,s ;  g.drawstring("input no in.each box",10,50);  try{  s1=text1.gettext();  x=integer.parseint(s1);  s2=text1.gettext();  y=integer.parseint(s2);   }  catch(exception e){}   z=x +y ;  s=string.valueof(z);  g.drawstring("the sum is:",10,75);  g.drawstring(s,100,75);  }  public boolean action (event event, object object )   {  repaint();  return true ;  }} 

you need change line:

public boolean action (event event, object object )  

to this:

public boolean action (event event, object object )  

note lowercase b in boolean. boolean , boolean not same thing.