ADDITIONAL SYSTEM INFORMATION :
IDE = Netbeans 12.5
JDK = 17


A DESCRIPTION OF THE PROBLEM :
I have created a simple GUI, one JComboBox and JButton. JButton populate the JComboBox with objects of class testString. When mouse hover the JComboBox it fired toString() of testString class almost 25 time or more. Why this happening? How we can stop it?
It should call toString() to render / refresh the String Item selected and displayed.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
ToSting() Called on Text ABC 1
ToSting() Called on Text EDF 2
ToSting() Called on Text ABC 3
ToSting() Called on Text ABC 4

* It would show "ToString() Called on Text ABC X" once on each move over
ACTUAL -
ToSting() Called on Text ABC 1
ToSting() Called on Text EDF 2
ToSting() Called on Text ABC 3
ToSting() Called on Text ABC 4
ToSting() Called on Text ABC 5
ToSting() Called on Text ABC 6
ToSting() Called on Text ABC 7
ToSting() Called on Text ABC 8
ToSting() Called on Text ABC 9
ToSting() Called on Text ABC 10
ToSting() Called on Text ABC 11
ToSting() Called on Text ABC 12
ToSting() Called on Text ABC 13
ToSting() Called on Text ABC 14
ToSting() Called on Text ABC 15
ToSting() Called on Text ABC 16
ToSting() Called on Text ABC 17
ToSting() Called on Text ABC 18
ToSting() Called on Text ABC 19
ToSting() Called on Text ABC 20
ToSting() Called on Text ABC 21
ToSting() Called on Text ABC 22
ToSting() Called on Text ABC 23
ToSting() Called on Text ABC 24
ToSting() Called on Text ABC 25
ToSting() Called on Text ABC 26
ToSting() Called on Text ABC 27

** Whereas it is triggering toString() almost 25 time on each move over.
I think triggering the toString() 25 times is slowing down the software speed and lower the performance.

---------- BEGIN SOURCE ----------
import javax.swing.DefaultComboBoxModel;

public class _NewJFrame extends javax.swing.JFrame {

public _NewJFrame() {
    initComponents();
}

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
    
    Object[] args = {new testString("ABC") , new testString("EDF") , "GIH", "IJK"};
    jComboBox1.setModel(new DefaultComboBoxModel(args ));
}
public static void main(String args[]) {
        

            new _NewJFrame().setVisible(true);
            
             
}

private javax.swing.JButton jButton1;
private javax.swing.JComboBox<String> jComboBox1;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JTextArea jTextArea1;
}



class testString {
String text;
static int i;
testString(String text){ this.text = text; };


public String toString(){
    System.out.println("ToSting() Called on Text " + text + " "+ ++i);

    return text;
}


}

---------- END SOURCE ----------

FREQUENCY : always