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问题是：父面板和子面板，父面板上有一个按钮，点击后弹出子面板，在子面板上填加相应的信息，最后把信息回传到父面板上，刚开始是这样设计：

if(e.getSource() == addArgsButton) {    HTTPWEBDetailsPane httpWebDetailsPane = new HTTPWEBDetailsPane();    argTemplItemList.addAll(httpWebDetailsPane.getArgTemplItemList());}

package com.mousedou.monitor.datashow.alarm.mainarea.schedule;import java.awt.BorderLayout;import java.awt.Color;import java.awt.Container;import java.awt.Dimension;import java.awt.FlowLayout;import java.awt.Font;import java.awt.GridLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.ItemEvent;import java.awt.event.ItemListener;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import javax.swing.BorderFactory;import javax.swing.ImageIcon;import javax.swing.JButton;import javax.swing.JComboBox;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JOptionPane;import javax.swing.JPanel;import javax.swing.JTabbedPane;import javax.swing.JTable;import javax.swing.JTextField;import javax.swing.SwingUtilities;import javax.swing.border.Border;import javax.swing.border.TitledBorder;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import Common.Action;import Common.ArgTempl;import Common.ArgTemplItem;import Common.ArgType;import Common.AssertType;import Common.CollectType;import Common.Element;import Common.ElementType;import Common.MonitorStep;import Common.OrgRawRule;import Common.ProtocolType;import Common.RawOperate;import Common.RawPosition;import Common.RespAssert;import Common.RespExpression;import Common.RespRaw;import Config.application.AppInfo;import Config.application.ApplicationGrp;import Config.application.ServiceInstance;import Config.parameter.ParameterDef;import Scheduler.NoExistAction;import Scheduler.NoExistArgTempl;import com.mousedou.monitor.alarmAnlyze.temp.ConvertUtil;import com.mousedou.monitor.datashow.alarm.ParaDefManager;import com.mousedou.monitor.datashow.alarm.mainarea.TableModel;import com.mousedou.monitor.datashow.receive.Client;import com.mousedou.monitor.datashow.receive.OperatorClient;public class HTTPWEBDetailsPane implements ActionListener{		private Logger log = LoggerFactory.getLogger(HTTPWEBDetailsPane.class);	// 添加应用组窗口	private JFrame frame;		//主面板	private JPanel pane;		private Client client;			//采集协议	private ProtocolType protocolType;		//参数模板	private ArgTempl argTempl;		//参数模板下拉框	private JComboBox argTemplCB;			//获得主机名	public JTextField hostNameField;		//获得端口号	public JTextField portField;		//获得路径	public JTextField pathField;		//获得方法名	public String methodName;				//ArgTemplItem列表，用来获取固定参数	private List
   
     argTemplItemList ;			public List
    
      getArgTemplItemList() {		return argTemplItemList;	}	//添加固定参数按钮	private JButton addArgsButton;		//取消	private JButton cancelButton;				private static final Dimension JLabel_size = new Dimension(60, 25);    private static final Dimension JTextField_size = new Dimension(110, 25);    private static final Dimension JButton_size = new Dimension(60, 25);    private static final Dimension JRadioButton_size = new Dimension(110, 25);    private static final Dimension JComboBox_size = new Dimension(140, 25);	    //弹窗操作    public HTTPWEBDetailsPane(){    	super();    	pane = new JPanel(new BorderLayout());    	this.client = OperatorClient.getClient();    	SwingUtilities.invokeLater(new Runnable() {			@Override			public void run() {				frame = new JFrame();				init(frame.getContentPane());				frame.setTitle("HTTPWEBDetailsPane");				frame.setSize(280, 260);				frame.setLocation(400, 240);				frame.setVisible(true);							}		});    }            private void init(Container container) {		if (container instanceof JFrame) {			((JFrame) container).setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);		}		initPane();		container.add(pane, BorderLayout.CENTER);	}    	private void initPane(){				JPanel paneN = new JPanel();		paneN.setPreferredSize(new Dimension(975, 10));		paneN.setBackground(Color.WHITE);		pane.add(paneN, BorderLayout.NORTH);				JPanel paneS = new JPanel();		paneS.setPreferredSize(new Dimension(975, 15));		paneS.setBackground(Color.WHITE);		pane.add(paneS, BorderLayout.SOUTH);				JPanel paneE = new JPanel();		paneE.setPreferredSize(new Dimension(15, 580));		paneE.setBackground(Color.WHITE);		pane.add(paneE, BorderLayout.EAST);				JPanel paneW = new JPanel();		paneW.setPreferredSize(new Dimension(15, 580));		paneW.setBackground(Color.WHITE);		pane.add(paneW, BorderLayout.WEST);				JPanel paneC = new JPanel(new BorderLayout());		paneC.setBackground(Color.WHITE);		pane.add(paneC, BorderLayout.CENTER);		setPaneC(paneC);	}		private void setPaneC(JPanel paneC){				JPanel addArgsPane = new JPanel(new BorderLayout());		addArgsPane.setPreferredSize(new Dimension(280, 260));		JPanel addArgsPaneC = new JPanel(new GridLayout(4, 0));		JPanel addArgsPaneC1 = new JPanel(new FlowLayout(FlowLayout.LEADING));		addArgsPaneC1.add(getTitleLabel("主机名"));		addArgsPaneC1.add(getHostName());		addArgsPaneC.add(addArgsPaneC1);		JPanel addArgsPaneC2 = new JPanel(new FlowLayout(FlowLayout.LEADING));		addArgsPaneC2.add(getTitleLabel("端口号"));		addArgsPaneC2.add(getPort());		addArgsPaneC.add(addArgsPaneC2);		JPanel addArgsPaneC3 = new JPanel(new FlowLayout(FlowLayout.LEADING));		addArgsPaneC3.add(getTitleLabel("路径"));		addArgsPaneC3.add(getPath());		addArgsPaneC.add(addArgsPaneC3);		JPanel addArgsPaneC4 = new JPanel(new FlowLayout(FlowLayout.LEADING));		addArgsPaneC4.add(getTitleLabel("方法名"));		addArgsPaneC4.add(getMethodCB());		addArgsPaneC.add(addArgsPaneC4);		addArgsPane.add(addArgsPaneC);				JPanel addArgsPaneS = new JPanel(new FlowLayout());		addArgsPaneS.setPreferredSize(new Dimension(280, 40));				final JFrame addArgsPaneFrame = new JFrame();		addArgsPaneS.add(getArgsSaveButton(addArgsPaneFrame));		addArgsPaneS.add(new JLabel(" "));		addArgsPaneS.add(getArgsCancelButton(addArgsPaneFrame));		addArgsPane.add(addArgsPaneS, BorderLayout.SOUTH);				paneC.add(addArgsPane, BorderLayout.CENTER);					}		/**	 * 获得名为name的标签 右对齐	 * @param name	 * @return	 */	public JLabel getTitleLabel(String name){		JLabel label = new JLabel(name, JLabel.TRAILING);		label.setPreferredSize(JLabel_size);		return label;	}		/**	 * 获得主机名	 */	private JTextField getHostName() {		hostNameField = new JTextField();		hostNameField.setPreferredSize(JTextField_size);		return hostNameField;	}		/**	 * 获得端口号	 */	private JTextField getPort() {		portField = new JTextField();		portField.setPreferredSize(JTextField_size);		return portField;	}		/**	 * 获得路径	 */	private JTextField getPath() {		pathField = new JTextField();		pathField.setPreferredSize(JTextField_size);		return pathField;	}		/**	 * 获得方法名下拉框	 */	private JComboBox getMethodCB() {		JComboBox methodCB = new JComboBox();		methodCB.addItem(" ");		methodCB.addItem("GET");		methodCB.addItem("POST");		methodCB.addItemListener(new ItemListener() {			@Override			public void itemStateChanged(ItemEvent e) {				String s = (String)e.getItem();				if(!s.equals(" ")){					methodName = s;				}else{					methodName = null;				}			}		});		return methodCB;	}			/**	 * 固定参数保存按钮	 * @param frame	 * @return	 */	private JButton getArgsSaveButton(final JFrame frame){		addArgsButton = new JButton("保存");		addArgsButton.setPreferredSize(JButton_size);		addArgsButton.addActionListener(this);				return addArgsButton;	}		/**	 * 取消按钮	 * @param frame	 * @return	 */	private JButton getArgsCancelButton(final JFrame frame){		cancelButton = new JButton("取消");		cancelButton.setPreferredSize(JButton_size);		cancelButton.addActionListener(this);		return cancelButton;	}			@Override	public void actionPerformed(ActionEvent e) {		if(e.getSource() == addArgsButton) {			String hostnameTemp = hostNameField.getText();			String portTemp = portField.getText();			String pathTemp = pathField.getText();			String methodNameTemp = methodName;						if(hostnameTemp == null || "".equals(hostnameTemp)){				JOptionPane.showMessageDialog(null, "请填写主机名！", "警告", JOptionPane.WARNING_MESSAGE);			}else if(portTemp == null || "".equals(portTemp)){				JOptionPane.showMessageDialog(null, "请填写端口号！", "警告", JOptionPane.WARNING_MESSAGE);			}else if(pathTemp == null || "".equals(pathTemp)){				JOptionPane.showMessageDialog(null, "请填写路径！", "警告", JOptionPane.WARNING_MESSAGE);			}else if(methodNameTemp == null || "".equals(methodNameTemp)){				JOptionPane.showMessageDialog(null, "请选择参数名称！", "警告", JOptionPane.WARNING_MESSAGE);			} else{				List
     
       argItemList = new ArrayList
      
       ();				ArgTemplItem argTemplItem1 = new ArgTemplItem("hostname", "主机名", hostnameTemp.getBytes(), ConvertUtil.encodeArgType("String"), ".*", "访问的主机名");				ArgTemplItem argTemplItem2 = new ArgTemplItem("port", "访问端口", portTemp.getBytes(), ConvertUtil.encodeArgType("int"), ".*", "访问的端口，默认为80");				ArgTemplItem argTemplItem3 = new ArgTemplItem("path", "访问路径", pathTemp.getBytes(), ConvertUtil.encodeArgType("String"), ".*", "访问的文件名或路径");				ArgTemplItem argTemplItem4 = new ArgTemplItem("methodName", "访问方法", methodNameTemp.getBytes(), ConvertUtil.encodeArgType("String"), ".*", "使用的方法“GET”或“POST”");								argItemList.add(argTemplItem1);				argItemList.add(argTemplItem2);				argItemList.add(argTemplItem3);				argItemList.add(argTemplItem4);								argTemplItemList.addAll(argItemList);								frame.dispose();			}		} else if(e.getSource() == cancelButton) {			frame.dispose();		}			}		public JPanel getHTTPWEBDetailsPane(){		return pane;	}		public static void main(String[] args){		SwingUtilities.invokeLater(new Runnable(){			@Override			public void run() {				JFrame frame = new JFrame("HTTPWEBDetailsPane");				HTTPWEBDetailsPane details = new HTTPWEBDetailsPane(null);				frame.getContentPane().add(details.getHTTPWEBDetailsPane());				frame.setSize(280, 260);				frame.setLocation(400, 240);				frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);				frame.setVisible(true);			}					});	}			}
      
     
    
   

正确的流程应该是弹出子面板后保存相应的数据到argTemplItemList，然后在父面板中调用子面板对象的getArgTemplItemList()方法，整好可以解决问题，就是上面第一段代码：

HTTPWEBDetailsPane httpWebDetailsPane = new HTTPWEBDetailsPane();argTemplItemList.addAll(httpWebDetailsPane.getArgTemplItemList());

可实际上完全不是那么回事，因为这是两个线程，父面板是一个线程，子面板也是一个线程，调用子面板的同时父面板线程会继续运行下去，执行这一句代码：

httpWebDetailsPane.getArgTemplItemList();

这时候得到的ArgTemplItemList当然是空的了。

解决方案其实也很简单，就是把父面板中argTemplItemList作为子面板的参数传给子面板，再为子面板设计一个有参的构造方法，这样在子面板对这个参数做的改动就会自动反应到父面板上来。

正确的几外关键代码如下：

父面板中：

if("HTTP".equals(decodeProtocolType(protocolType))) {					HTTPWEBDetailsPane httpWebDetailsPane = new HTTPWEBDetailsPane(argTemplItemList);			}

//ArgTemplItem列表，用来获取固定参数	private List
   
     argTemplItemList ;//有参的构造参数    public HTTPWEBDetailsPane(List
    
      argTemplItemList){    	super();    	this.argTemplItemList=argTemplItemList;    	pane = new JPanel(new BorderLayout());    	this.client = OperatorClient.getClient();    	SwingUtilities.invokeLater(new Runnable() {			@Override			public void run() {				frame = new JFrame();				init(frame.getContentPane());				frame.setTitle("HTTPWEBDetailsPane");				frame.setSize(280, 260);				frame.setLocation(400, 240);				frame.setVisible(true);							}		});    }
    
   

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