java - cannot find symbol error while using jframe -


this question has answer here:

i have class called validation looks this:

package information;  public class validation {      public static boolean emptystring(string s) {         if (s == null || s.isempty()) {             return true;         } else {             return false;         }     } }

this jframe class: 

private void jbutton1actionperformed(java.awt.event.actionevent evt) {      if (validation.emptystring(jtextfield1.gettext()) || validation.emptystring(jtextfield2.gettext()))      {         joptionpane.showmessagedialog(null, "don't leave fields empty");     } else {         if (testaadmin(jtextfield1.gettext(), jtextfield2.gettext())) {             basen basenframe = new basen();             basenframe.setvisible(true);             this.dispose();         } else {             joptionpane.showmessagedialog(null, "wrong username or password");         }      }  }

the problem validation in jframe class doesn't seem supposed communicate validation class.

it gives me error message: 

error: cannot find symbol validation.emptystring(jtextfield2.gettext()))

why this?

the problem due missing import. if validation class in different package jframe, need explicitly imported per mrwiggles answer:

import information.validation;

i'd suggest download an ide, e.g. eclipse or intellij, give more informative messages compiler , automated assistance fix them.

also, when compiler error, might use google find explanation , save having post question on stackoverflow. need omit application-specific terms. searching for: "error: cannot find symbol" finds long stackoverflow post on subject.


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