Question

所以我一直在编写关于JPizza.java的代码，我已经到了这个错误的地步：

    JPizza.java:38: error: cannot find symbol
  music = getAudioClip(getCodeBase(),"katy_perry-roar.mid");
                       ^
  symbol:   method getCodeBase()
  location: class JPizza
  1 error

我一直想弄清楚为什么它会给我这些错误，但是我在这里找不到主要问题？是因为我忘了定义一个方法？对于getCodeBase（）和CodeBase（），我尝试将其定义为CodeBase() = getCodeBase()，然后将错误转移到getAudioClip

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.applet.*;

public class JPizza extends JFrame implements ItemListener, ActionListener
 {
  FlowLayout flow = new FlowLayout();
  JLabel companyName = new JLabel("PizzaPalooza");
  JComboBox<String> sizeBox = new JComboBox<String>();
  JLabel sizeList = new JLabel("Size List");
  JComboBox<String> toppingBox = new JComboBox<String>();
  JLabel toppingList = new JLabel("Topping List");
  JTextField totPrice = new JTextField(10);
  JLabel orderName = new JLabel("Name of Order");
  JTextField oName = new JTextField(15);
  JLabel listenLabel = new JLabel("Listen to our theme!");
  JButton playButton = new JButton("Play");
  JButton stopButton = new JButton("Stop");
  JLabel headLabel = new JLabel ();
  AudioClip music;
  int totalPrice = 0;
  int sizeNum, toppingNum;
  int sPrice, tPrice, sumPrice;
  int[] sizePrice = {0,7,9,11,14};
  int[] toppingPrice = {0,0,1,1,1,1};
  String output;
   public void init()
    {
     Container con = getContentPane();
     con.setLayout (new FlowLayout());
     con.add(headLabel);
     con.add(listenLabel);
     con.add(playButton);
     con.add(stopButton);
     playButton.addActionListener(this);
     stopButton.addActionListener(this);
     music = getAudioClip(getCodeBase(),"katy_perry-roar.mid");
    }

     public void actionPerformed(ActionEvent e)
     {
      Object source = e.getSource();
      if(source == playButton)
       music.loop();
      else
       music.stop();
     }

为此，但我不明白这意味着什么？

Answer 1

编译问题在于上面的行。您在

行中缺少JLabel构造函数括号和分号

  JLabel headLabel = new JLabel

应该是：

  JLabel headLabel = new JLabel();

编译时出错？

1 个答案: