java_swing 如何获取ButtonGroup的值

JRadioButton man= new JRadioButton("男");
man.setBounds(80,30,45,20);
panel.add(man);
JRadioButton woman= new JRadioButton("女");
woman.setBounds(125,30,45,20);
panel.add(woman);
ButtonGroup sexgrip = new ButtonGroup();// 设置性别组，保证只能选一个
sexgrip.add(man);
sexgrip.add(woman);

当点击他们其中一个后怎么取值？这样

if (man.isSelected()){//判断man被点击时
System.out.println("男");
}
else if (woman.isSelected()){//判断woman被点击时
System.out.println("女");
}