[单项选择题] 阅读下列代码片段 class InterestTest______ActionListener public void actionPerformed(ActionEvent ev

[单项选择题] 阅读下列代码片段

class InterestTest______ActionListener

public void actionPerformed(ActionEvent event)

double interest=balance*rate/100;

balance+=interest;

NumberFormat format=NumberFormat. getCurrencyInstance();

System. out. print]b("balance="+formatter. format(balance));

Private double rate;

在下画线处，应填的正确选项是______。

A．Implementation

B．Inheritance

C．implements

D．extends