jComboBox2 ItemStateChanged.
private void jComboBox2ItemStateChanged(java.awt.event.ItemEvent evt) {
String name=jComboBox2.getSelectedItem().toString();
if(name.equals("Bristish Nutrition"))
{
jTextField1.setText("BN");
}
else if(name.equals("Muscle Blaze"))
{
jTextField1.setText("MB");
}
}