java - Create a new ArrayList in Netbeans -

i'm new programming in netbeans, keep simple possible, please.

so, right have 3 java files in same project: mainframe.java, edit.java , add.java.

in mainframe-window have 2 buttons edit , add-window. in add-window enter text in text field , press button add arraylist, did this:

public static void main(string args[]) {      list<string> hey = new arraylist<string>(); } 

and button:

private void btnfortsattactionperformed(java.awt.event.actionevent evt)   {      //the variable name of text field "txfcreate"      string text = txfcreate.gettext();     hey.add(text);  //the problem here netbeans cannot find "hey" symbol   }  

next, in edit-window, have jlist show content of arraylist. have no idea know how code it:(

public class {  list<string> hey;  public static void main(string args[]) {     hey = new arraylist<string>(); }  private void btnfortsattactionperformed(java.awt.event.actionevent evt) {     //the variable name of text field "txfcreate"      string text = txfcreate.gettext();     hey.add(text);  //the problem here netbeans cannot find "hey" symbol  } 

}