How to get radio button text to put in textarea

the source code :

if(jb1.isSelected()){
       System.out.println("LAKI-LAKI");
    }
    else if(jb2.isSelected()){
        System.out.println("PEREMPUAN");
    }
    
    jb11=jb1.getText();
    jb22=jb2.getText();
    
    textarea.setText("NIM : " + nim1 + "\n"+ "NAMA : " + nama1 + "\n" + "Jenis Kelamin : " + buttonGroup1);
}

what i want is when i select the radio button it will show in text area, how to do that?