请问一个applet的简单问题

我新建的一个BigDebtApplet.java文件：
import java.awt.*;

public class BigDebtApplet extends com.java.swing.JApplet{
int debt;

public void init(){
debt=446000000;
debt=debt/1440;
}
public void paint(Graphics screen){
super.paint(screen);
Graphics2D screen2D=(Graphics2D)screen;
screen2D.drawString("A minute"s worth of debt is $" +debt, 5,50);
}
}

然后用javac BigDebtApplet.java后出现下列错误
BigDebtApplet.java:3: package com.java.swing does not exist
public class BigDebtApplet extends com.java.swing.JApplet{
^
BigDebtApplet.java:11: cannot resolve symbol
symbol : variable super
location: class BigDebtApplet
super.paint(screen);
^
2 errors
请问是什么回事，要怎么解决啊，谢谢！



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