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();

    }

}