Question

java程序问题，高手请进！

java我按书上写了个mp3播放器程序，可是编译时显示
注: J_Audio.java使用了未经检查或不安全的操作。
注: 有关详细信息, 请使用 -Xlint:unchecked 重新编译。
要怎么改

import java.applet.AudioClip;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.ActionListener;
import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JComboBox;
public class J_Audio extends JApplet implements ActionListener, ItemListener

{private AudioClip m_soundFirst, m_soundSecond, m_soundCurrent;
private JButton m_buttonPlay, m_buttonLoop, m_buttonStop;
private JComboBox m_comboChoose;
public void init()
{
Container c=getContentPane();
c.setLayout(new FlowLayout());
String choices [] = {"hi","bark"};//我知道这行出问题了，要怎么改呢？
m_comboChoose = new JComboBox(choices);
m_comboChoose.addItemListener(this);
c.add(m_comboChoose);
m_buttonLoop = new JButton("播放");
m_buttonPlay.addActionListener(this);
c.add(m_buttonPlay);
m_buttonLoop = new JButton("循环播放");
m_buttonLoop.addActionListener(this);
c.add(m_buttonLoop);
m_buttonStop = new JButton("暂停播放");
m_buttonStop.addActionListener(this);
c.add(m_buttonStop);
m_soundFirst = getAudioClip(getDocumentBase(), "hi.wmv" );
m_soundSecond = getAudioClip(getDocumentBase(), "bark.wmv" );
m_soundCurrent = m_soundFirst;
}
public void stop()
{
m_soundCurrent.stop();
}
public void itemStateChanged(ItemEvent e)
{
m_soundCurrent.stop();
m_soundCurrent=(m_comboChoose.getSelectedIndex() == 0 ?
m_soundFirst : m_soundSecond);
}

public void actionPerformed(ActionEvent e)
{
if (e.getSource() == m_buttonPlay)
m_soundCurrent.play();
else if (e.getSource()==m_buttonLoop)
m_soundCurrent.loop();
else if (e.getSource()==m_buttonStop)
m_soundCurrent.stop();
}
}

Answer 1

你好，在方法的最前面加:
@SuppressWarnings("unchecked")，就可以了。