![](https://cos-cdn.shuashuati.com/pipixue-web/2020-1231-2005-12/ti_inject-812ce.png)
阅读下面代码 class InterestTest ______ ActionListener { … public void actionPerformed(ActionEvent event) { double interest=balance * rate/100: balance+=interest: NumberFormat format=NumberFormat.getCurrencyInstance(); System.out.printlb('balance='+Formatter.format(balance)); } Private double rate; } 在下画线处,应填入的正确选项是