Pls help screwy problem with this code

Question

Im pretty new to java, and I'm trying to make a MASH program to practice. I cant figure out this error, as it checks out with some examples from a book. Please help!
When compiling in the command prompt, this is what the errors are:
cannot resolve symbol
symbol: class MashBuild
location: class MashEvent
MashBuild gui;
^
cannot resolve symbol
symbol: class MashBuild
location: class MashEvent
public MashEvent(MashBuild in) {
^
Here is the code for MashEvent.java -- I also have a class called MashBuild that has the code for the display of the program and all of the JButtons, etc. so I dont see why this shouldn't work
import javax.swing.*;
import java.awt.event.*;
public class MashEvent implements ActionListener, Runnable {
     MashBuild gui;
     Thread playing;
     public MashEvent(MashBuild in) {
     gui = in;
     public void actionPerformed(ActionEvent event) {
          String command = event.getActionCommand();
          if (command == "Play")
          startPlaying();
          if (command == "Reset")
          clearAllFields();
     void startPlaying() {
          playing = new Thread(this);
          playing.start();
          gui.play.setEnabled(false);
          gui.reset.setEnabled(true);
     void clearAllFields() {
          for (int i = 0; i < 10; i++) {
          gui.houses.setText(null);
          gui.cars[i].setText(null);
          gui.people[i].setText(null);
          gui.kids[i].setText(null);
          gui.houseTR.setText(null);
          gui.carTR.setText(null);
          gui.peopleTR.setText(null);
          gui.kidTR.setText(null);
     public void run() {
          Thread thisThread = Thread.currentThread();
          while (playing == thisThread) {
          int choice;
          choice = (int)Math.floor(Math.random() * 10);
          if (choice != 40) {
               gui.houseTR.setText(gui.houses[0].value);
               gui.carTR.setText(gui.cars[0].value);
               gui.peopleTR.setText(gui.people[0].value);
               gui.kidTR.setText(gui.kids[0].value);
                    try {
                         Thread.sleep(100);
                    } catch(InterruptedException e) { }

Answer 1

Or more precisely, did you compile MashBuild.java into MashBuild.class...
It's one of the errors I run into when I forget to compile one of the classes that another class calls...
- MaxxDmg...
- ' He who never sleeps... '