这段代码会导致内存泄漏吗?
垃圾收集器何时被激活?是计时器结束的时候吗?或者即使计时器仍在运行,GC也会被调用?
public static SwingWorker sw;
t2 = new Timer (300,this);
t2.start();
@Override
public void actionPerformed(ActionEvent arg0) {
try {
sw = new TextAreaMainPanelWorker();
sw.execute();
} catch (Throwable e) {
e.printStackTrace();
}
}
TextAreaMainPanelWorker 类:
public class TextAreaMainPanelWorker extends SwingWorker<Integer, Integer>
{
protected Integer doInBackground() throws Exception
{
ConnectMysql.fetchMessage(MainPanel.jtep,MainPanel.sd,MainPanel.count);
return 1;
}
protected void done()
{
try
{
ConnectMysql.rodolfol(MainPanel.jtep, MainPanel.sd);
}
catch (Exception e)
{
e.printStackTrace();
}
}
查询数据库的方法:
public static void fetchMessage(JTextPane jtep,StyledDocument sd,int count )
{
try{
String query = "SELECT members.username, message,color FROM chat JOIN members ON chat.user_id = members.id WHERE message_id > "+count+" AND user_id != 1";
ps = con.prepareStatement(query);
rs = ps.executeQuery();
}catch(Exception e){}
}
public static void rodolfol(JTextPane jtep,StyledDocument sd){
try {
while(rs.next())
{
try {
final JLabel jp = new JLabel(rs.getString("username")+ "\n");
jp.setAlignmentY(0.75f);
final String usernameChat = rs.getString("username");
jp.addMouseListener(new MouseListener(){
@Override
public void mouseClicked(MouseEvent e) {}
@Override
public void mouseEntered(MouseEvent e) {
Cursor c = Cursor.getPredefinedCursor(Cursor.HAND_CURSOR);
jp.setCursor(c);
}
@Override
public void mouseExited(MouseEvent e) {
}
@Override
public void mousePressed(MouseEvent e) {
if(SwingUtilities.isRightMouseButton(e)){System.out.print("lawl");}
if(e.getClickCount() == 2)new OneToOneChat(usernameChat);
jp.setForeground(Color.BLUE);
}
@Override
public void mouseReleased(MouseEvent e) {
jp.setForeground(Color.BLACK);
}
});
jp.setFont(new Font("arial",Font.BOLD,16));
jtep.insertComponent(jp);
StyleConstants.setForeground(MainPanel.sas2, Color.BLACK);
MainPanel.sd.insertString(MainPanel.sd.getLength(), ": ", MainPanel.sas2);
StyleConstants.setForeground(MainPanel.sas,new Color(Integer.parseInt(rs.getString("color"))));
sd.insertString(sd.getLength(),rs.getString("message")+ "\n", MainPanel.sas);
} catch (BadLocationException e1) {
}finally{
}
MainPanel.count++;}
} catch (SQLException e) {
}finally{
if (rs != null) {
try {
rs.close();
} catch (SQLException sqlEx) { }
rs = null;
}
if (ps != null) {
try {
ps.close();
} catch (SQLException sqlEx) { }
ps = null;
}
}
}
最佳答案
block 引用>When will the garbage collector be activated? Is it when the timer finishes? or GC will be called even though the timer is still running?
感觉垃圾收集随时都会发生。通常,当应用程序内存不足时。当计时器仍在运行时,GC 可能会运行,从而使您的应用程序暂停(使用并行/吞吐量收集器)。
所以基本上你无法控制 GC 何时启动。它可能随时发生,无论你在代码中做什么。
关于java - 这会导致内存泄漏吗?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/16533485/