Java论坛没人，只好老这里了
大家好！最近我在编个ATM机GUI程序，用swing做，可是现在遇到4个错误了，但我一直不知道怎么解决。
我的主程序AtmGUI程序如下， 现在总是提示红色字的地方有问题，“cannot resolve symbol : constructor KeyPad (AtmGUI)”和“cannot resolve symbol : constructor KeyPad (AtmGUI)”
万能的搂住能不能指点一下？苦恼死了

import javax.swing.*; //Packages used
import java.awt.*;
import java.awt.event.*;

public class AtmGUI extends JFrame
implements ActionListener{

private JButton confirm = new JButton("Confirm");
private JTextField input = new JTextField(20);
private JTextArea display = new JTextArea(5,20);
private KeyPad keypad = new KeyPad(this);
private FounctionPad founctionpad = new FounctionPad(this);


public AtmGUI(){

getContentPane().setLayout(new BorderLayout());
keypad = new KeyPad(this);
founctionpad = new FounctionPad(this);

getContentPane().add(input,"North"); //input

getContentPane().add(display,"Center"); //display
display.setLineWrap(true);
display.setEditable(false);

JPanel controlPanel = new JPanel(new BorderLayout(0,0)); //control panel
controlPanel.add(keypad,"Center");
controlPanel.add(confirm,"South");
getContentPane().add(controlPanel,"East");

getContentPane().add(founctionpad,"West"); //founction

confirm.addActionListener(this);
input.addActionListener(this);
}

public void actionPerformed(ActionEvent e){
double cash = Double.valueOf(input.getText()).doubleValue();
display.append(cash+"\n");
input.setText("");
}



public void keypressCallback(String s){
if(s.equals("C"))
input.setText("");
else
input.setText(input.getText() + s);
}

public static void main(String args[]){
AtmGUI f = new AtmGUI();
f.setSize(400,300);
f.setVisible(true);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

}