Getting started with JTabbedPane

Here's the start of my application where I am trying to utilize the JTabbedPane class.

I want the frame to open with size 500x500 and
be a JTabbedPane. Why am I getting a constructor error right at the beginning? I don't see my error.

Quote:

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openPage.java [30:1] cannot resolve symbol
symbol : constructor openPage (java.lang.String)
location: class openPage
openPage OP = new openPage("Tool Inventory");
^
1 error

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Code:

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import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.event.*;
public class openPage extends JFrame
{
  //  JTabbedPane TP = new JTabbedPane();
   
   
    /** Creates a new instance of openPage */
    public openPage()
    {
        this.setSize(500,500);
        this.setLocation(150,50);
        this.getContentPane().setLayout(new FlowLayout());
      // this.getContentPane().add(TP,"Tool Inventory");
        this.setVisible(true);
        addWindowListener(new CloseWindow());
       
       
    }

    public static void main(String[] args)
    {
        //here is the error line
      openPage OP = new openPage("Tool Inventory");
      OP.pack();
      OP.show();
     
    }
   
    class CloseWindow extends WindowAdapter
    {
    public void windowClosing(WindowEvent event)
    {
        System.exit(0);
    }
    }
   
}

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