[单选题]
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
A.implementation
B.inheritance
C.implements
D.extends
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