error code help

Hello everybody.
I have met a problem ,the following java code can't be compiled successfully in one of my computer but can be succeed in another one.Does anyone could tell me what is the problem?

I list the Code and Error message as below:
thank you in advance!

Code:

---

//////////////////////////////////////Code://///////////////////////////////////////////////

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class Win extends JFrame implements ItemListener
{ JComboBox list;
  JTextArea text;
  Win()
  { list=new JComboBox();
    text=new JTextArea();
    Button b=new Button();
    b.setBackground(Color.yellow);
    text.setForeground(new Color(12,250,34));
    list.setForeground(Color.blue);
      list.setBackground(Color.cyan);
    GraphicsEnvironment ge=
    GraphicsEnvironment.getLocalGraphicsEnvironment();
    String fontName[]=ge.getAvailableFontFamilyNames();
    for(int i=0;i<fontName.length;i++)
    { list.addItem(fontName[i]);
    }
    add(list,BorderLayout.NORTH);
    add(new JScrollPane(text),BorderLayout.CENTER);
    list.addItemListener(this);
    setVisible(true);
    setBounds(100,120,300,300);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    validate();
  }
  public void itemStateChanged(ItemEvent e)
  {  String name=(String)list.getSelectedItem();
      Font f=new Font(name,Font.BOLD,32);
      text.setFont(f);
      text.setText("\n2008bj");
  }
}
public class Example8_18
{  public static void main(String args[])
    {  Win win=new Win();
    }
}

---

///////////////////////////////////Error Message:////////////////////////////////////////////

Example8_18.java:11: setBackground(java.awt.Color) in java.awt.Component cannot
be applied to (Color)
b.setBackground(Color.yellow);
^
Example8_18.java:12: enum types may not be instantiated
text.setForeground(new Color(12,250,34));
^
Example8_18.java:13: cannot find symbol
symbol : method setForeground(Color)
location: class javax.swing.JComboBox
list.setForeground(Color.blue);
^
Example8_18.java:14: cannot find symbol
symbol : variable cyan
location: class Color
list.setBackground(Color.cyan);
^
4 errors

It would appear you have a Enum called Color on the classpath that the compiler is finding before it is finding java.awt.Color.

You could either:

1. Remove the Color Enum from the classpath (but only if it has nothing to do with this class).
2. Add an import statement to explicitly import java.awt.Color ie
   
   Code:

   ---

   import java.awt.Color;

   ---

3. Use the fully specified name wherever you use Color ie
   
   Code:

   ---

   list.setForeground(java.awt.Color.blue);

   ---