关于Java Swing ButtonGroup获取用法

JRadioButtonb1 = new JRadioButton("b1");
JRadioButtonb2 = new JRadioButton("b2");
ButtonGroup scanMode = new ButtonGroup();
scanMode .add(b1);
scanMode .add(b2);
String model = null;
Enumeration<AbstractButton> modelBtns=getScanMode().getElements();
while (modelBtns.hasMoreElements()) {
AbstractButton modelbtn = modelBtns.nextElement();
if(modelbtn.isSelected()){
model=modelbtn.getText();
break;
}
}