我的头好像被捆住了。我是java新手，正在努力学习。到目前为止，我正在做一个applet程序，它应该接收用户输入（朋友列表）并在applet窗口上垂直输出。到目前为止，我正在努力解决以下问题：
侦听来自两个或多个按钮的事件
从textfield获取用户输入，并将其添加到arraylist
下面是我目前的代码。谢谢您。

import java.awt.*;
import java.applet.*;
import java.awt.event.*;
import java.util.*;
public class NamesArraylistExample extends Applet implements ActionListener
{
    ArrayList<String> listOfClassmates = new ArrayList<String>();
    Label titleLabel;
    Label noticeLabelA;
    Label noticeLabelB;
    Label namesInputLabel;
    Label namesOutputLabel;
    TextField namesInput;
    Button submitButton;
    Button quitButton;
    String nameInput;
    boolean action = true;
    int maxInput = 20;
    int countInput = 0;
    int yPn = 220;
    public void init()
    {
        setSize(300, 700);
        titleLabel = new Label("WELCOME TO THE NAMES LISTING PROGRAM");
        noticeLabelA = new Label("Please enter your classmates' names below");
        noticeLabelB = new Label("Press \"Quit\" button to cease adding");
        namesInputLabel = new Label("Please enter your friends names: (*)");
        namesOutputLabel = new Label("Below is a list of your friends.");
        namesInput = new TextField(35);
        submitButton = new Button("Submit");
        quitButton = new Button("Quit");
        add(titleLabel);
        add(noticeLabelA);
        add(noticeLabelB);
        add(namesInputLabel);
        add(namesInput);
        add(submitButton);
        add(quitButton);
        submitButton.addActionListener(this);
        quitButton.addActionListener(this);
    }
    public void paint(Graphics g)
    {
        g.drawLine(20, 175, 280, 175);
        while (action=true && countInput<maxInput)
        {
            listOfClassmates.add(nameInput);
            countInput++;
        }
        g.drawString("Here is a list of your friends", 20, 200);
        //displays the array list contents vertically
        for (int i = 0; i < listOfClassmates.size(); i++) 
        {
            //   accessing each element in the array list as per index
            String s = listOfClassmates.get(i);
            g.drawString("*"+ s + ".", 20, yPn);
            yPn = yPn + 15;
        }
        g.drawLine(20, 600, 280, 600);
    }
    public void actionPerformed(ActionEvent e)
    {
        nameInput = namesInput.getText();
//        if(e.getActionCommand().equals("Submit"))
//        {
//            
//            nameInput = namesInput.getText();
//        }
//        else
//        {
//            
//            action = false;
//        }
        repaint();
    }
}