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1) BeatBox.java
package headfirst.sd.chapter6;
import java.awt.*;
import javax.swing.*;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import java.io.*;
import javax.sound.midi.*;
import java.util.*;
import java.awt.event.*;
import java.net.*;
public class BeatBox { // implements MetaEventListener
JPanel mainPanel;
JList incomingList;
JTextField userMessage;
ArrayList[JCheckBox] checkboxList; // checkbox¸¦ arrayList¿¡ ÀúÀå.
int nextNum;
ObjectInputStream in;
ObjectOutputStream out;
Vector[String] listVector ¡ë new Vector[String]();
String userName ;
HashMap[String, boolean[]] otherSeqsMap ¡ë new HashMap[String, boolean[]]();
Sequencer sequencer;
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