Whenever compile, I keep getting the error that it cannot find the symbol

Question

I'm new to JTextArea and JScrollPane, whenever I compile I get this error, Project3.java:95: cannot find symbol symbol : class Dimension location: class Project3 scroll.setPreferredSize(new Dimension(200, 400));

Can someone please help me?

    JTextArea listBox = new JTextArea(input);
    JScrollPane scroll = new JScrollPane(listBox);  
    listBox.setLineWrap(true);  
    listBox.setWrapStyleWord(true); 
    scroll.setPreferredSize(new Dimension(200, 400));
    JOptionPane.showMessageDialog(null, scroll, "Dictionary enteries" JOptionPane.PLAIN_MESSAGE);

   return aLineFromFile;

This is the full method.

 public static String listDictionary()throws IOException
{
   String input = "";
   BufferedReader br = new BufferedReader(new FileReader("dictionary.txt"));
   String aLineFromFile = null;

   while((aLineFromFile = br.readLine()) != null)
   {
        input += aLineFromFile + "\n";
   }
   br.close();
    JTextArea listBox = new JTextArea(input);
    JScrollPane scroll = new JScrollPane(listBox);  
    listBox.setLineWrap(true);  
    listBox.setWrapStyleWord(true); 
    scroll.setPreferredSize(new Dimension(200, 400));
    JOptionPane.showMessageDialog(null, scroll, "Dictionary enteries", JOptionPane.PLAIN_MESSAGE);

   return aLineFromFile;
}

I have imported, import java.io.; import javax.swing.; import java.util.*;

Answer 1

Dimension is in java.awt, so add import java.awt.Dimension;

I would suggest using Eclipse or Netbeans. They will tell you that you need to add imports like this.