How can I get the values of checked checkbox inside the jTable and calculate they average in Java

I am trying to create a rating prototype in java, were a use can rate the aspect by clicking the checkbox. I am trying to capture the values for selected checkbox inside the table and calculate they average. And I want the user to be able to select only one checkbox in each row.

See the image to get a clear idea of what I mean

enter code here

    int rating;
    int checkBox;
    int average = 0;
    
    for(int a=0; a<jTable1.getRowCount(); a++){
        
        Boolean isChecked = Boolean.valueOf(jTable1.getValueAt(a, +1).toString());
            if (isChecked) {
                rating =+1;
            //get the values of the columns you need.
            } else {
            System.out.printf("Row %s is not checked \n", a);
            
            
}
        for(int c=1; c<jTable1.getColumnCount(); c++){
            
            
        
            //if( jTable1.getValueAt(c, 1).isSelected()==true){
               //rating = 1;
            //}
        }  
    }

See the image here to have a clear idea of what i am saying