关于Java Swing ButtonGroup获取用法

简单事例代码：

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;  
        }  
}