tool tip text on java

JAVA MAIN FILE
--------------------------

package apples;

import javax.swing.JFrame;

public class Main
{
    public static void main(String[] args)
    {
    tuna obj = new tuna();
    obj.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    obj.setSize(275, 180);
    obj.setVisible(true);
    }
}

JAVA FILE
----------------

package apples;

import java.awt.FlowLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;

public class tuna extends JFrame
{
    private JLabel item1;

    public tuna()
    {
    super("The Title Bar");
    setLayout(new FlowLayout());

    item1 = new JLabel("This is a sentnce");
    item1.setToolTipText("You have hovred over it");
    add(item1);
    }
}