java 此时没有显示控制台 java控件不显示

做课设，想用Java仿一个微信页面出来。

界面结构大概是这样的：一个 JFrame 中有左中右三个 JPanel，然后左边的 JPanel 中又添加了一个放头像的 PicturePanel。PicturePanel做的事情大概就是：如果 new PicturePanel(ImageIcon picture) 的参数为 ImageIcon ，就将 ImageIcon 作为头像 new 一个 JLabel 添加进 PicturePanel 中，如果 PicturePanel(null) 的参数为空，就调用 PicturePanel 的 PaintComponent() 方法绘制默认头像。

现在的问题是：我自己测试 PicturePanel 这个类好像是没问题的，图片和绘制图形都可以正常显示。在 JFrame 最左边的深色 JPanel(MenuPanel)中 new PicturePanel(null) 也可以正常显示绘制的默认头像，但是，一旦我在 JFrame 最左边的深色 JPanel(MenuPanel)中 new PicturePanel(ImageIcon picture) ，不仅图像显示不出来，JFrame中原先添加的三个JPanel也不会显示。效果如图：

以下是代码：

PicturePanel.java
package View.Icons;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Rectangle;
import javax.swing.ImageIcon;
import javax.swing.JLabel;
import javax.swing.JPanel;
/**
* 绘制用户头像
* @date 2016/10/20
* @version 1.0
*/
public class PictureIconPanel extends JPanel {
private static final long serialVersionUID = 1L;
/**
* 用户头像 ImageIcon
*/
private ImageIcon picture = null;
/**
* 默认图片宽度
*/
private int pictureWidth = 37;
/**
* 默认图片高度
*/
private int pictureHeight = 37;
/**
* 构造方法
* 
生成一个用户头像面板
* @param picture 用户头像
*/
public PictureIconPanel(ImageIcon picture) {
this.picture = picture;
this.setLayout(null);
this.setBounds(new Rectangle(this.pictureWidth, this.pictureHeight));
if (picture != null) {
// 如果 ImageIcon 不为空，将 ImageIcon 添加进 picturePanel 中
JLabel pictureLabel = new JLabel();
// 按照 pictureWidth 和 pictureHeight 进行等比缩放
picture.setImage(picture.getImage().getScaledInstance(this.pictureWidth, this.pictureHeight, Image.SCALE_DEFAULT));
pictureLabel.setIcon(picture);
pictureLabel.setBounds(new Rectangle(this.pictureWidth, this.pictureHeight));
this.add(pictureLabel);
}
}
/**
* 绘制指定宽高的头像面板
* @param width 面板宽度
* @param height 面板高度
* @param picture 头像
*/
public PictureIconPanel(int width, int height, ImageIcon picture) {
this.pictureWidth = width;
this.pictureHeight = height;
this.picture = picture;
this.setLayout(null);
this.setBounds(new Rectangle(pictureWidth, this.pictureHeight));
if (picture != null) {
// 如果 ImageIcon 不为空，将 ImageIcon 添加进 picturePanel 中
JLabel pictureLabel = new JLabel();
// 按照 pictureWidth 和 pictureHeight 进行等比缩放
picture.setImage(picture.getImage().getScaledInstance(this.pictureWidth, this.pictureHeight, Image.SCALE_DEFAULT));
pictureLabel.setIcon(picture);
pictureLabel.setBounds(new Rectangle(this.pictureWidth, this.pictureHeight));
this.add(pictureLabel);
}
}
/*
* (non-Javadoc)
* @see javax.swing.JComponent#paintComponent(java.awt.Graphics)
* 如果图片参数为空，绘制默认头像
*/
public void paintComponent(Graphics g) {
super.paintComponent(g);
// 如果图片参数为空，绘制默认头像
if (this.picture == null) {
// 开始绘制头像
g.setColor(new Color(65, 65, 65));
g.fillOval((int)(10 / 37.0 * this.pictureWidth), 0, (int)(15 / 37.0 * this.pictureWidth), (int)(17 / 37.0 * this.pictureHeight));
g.fillRect((int)(15 / 37.0 * this.pictureWidth), (int)(15 / 37.0 * this.pictureHeight), (int)(5 / 37.0 * this.pictureWidth), (int)(5 / 37.0 * this.pictureHeight));
g.fillOval((int)(2 / 37.0 * this.pictureWidth), (int)(17 / 37.0 * this.pictureHeight), (int)(33 / 37.0 * this.pictureWidth), (int)(20 / 37.0 * this.pictureHeight));
// System.out.println("4654564654654");
}
}
}
Test.java   测试PicturePanel
package View;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import View.Icons.PictureIconPanel;
public class TEST{
public static void main(String[] args) {
JFrame frame = new JFrame("TEST");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(new PictureIconPanel(new ImageIcon("D:\\Coding\\Java\\workspace\\WeChat\\files\\pictures\\a.jpg")));
frame.pack();
frame.setVisible(true);
// new WeChatFrame();
}
}

效果图：

WeChatFrame.java   就是一个JFrame
package View;
import java.awt.event.MouseEvent;
/**
* 微信框架
*
* @date 2016年10月22日
* @version 1.0
*/
public class WeChatFrame extends MyFrame {
private static final long serialVersionUID = 1L;
/**
* 菜单面板
*/
private MenuPanel menuPanel;
/**
* 对话列表面板
*/
private DialogListPanel dialogListPanel;
/**
* 聊天面板
*/
private ChattingPanel chattingPanel;
public WeChatFrame() {
this.setLayout(null);
this.setMenuPanel();
this.setDialogListPanel();
this.setChattingPanel();
}
private void setMenuPanel() {
this.menuPanel = new MenuPanel();
this.menuPanel.setBounds(0, 0, 50, this.getHeight());
this.getContentPane().add(this.menuPanel);
}
private void setDialogListPanel() {
this.dialogListPanel = new DialogListPanel();
this.dialogListPanel.setBounds(50, 0, 249, this.getHeight());
this.getContentPane().add(this.dialogListPanel);
}
private void setChattingPanel() {
this.chattingPanel = new ChattingPanel();
this.chattingPanel.setBounds(299, 0, this.getWidth() - 299, this.getHeight());
this.getContentPane().add(this.chattingPanel);
}
/**
* 重新设置组件的大小以及位置
*/
private void resetElementLocation() {
// 设置 menuPanel 的大小及位置
this.menuPanel.setBounds(0, 0, 50, this.getHeight());
// 设置 dialogPanel 的大小及位置
this.dialogListPanel.setBounds(50, 0, 249, this.getHeight());
// 设置 chattingPanel 的大小及位置
this.chattingPanel.setBounds(299, 0, this.getWidth() - 299, this.getHeight());
}
/*
* (non-Javadoc)
*
* @see View.MyFrame#mouseClicked(java.awt.event.MouseEvent) 重写 MyFrame 中的
* mouseClicked 方法
*/
public void mouseClicked(MouseEvent event) {
super.mouseClicked(event);
this.resetElementLocation();
}
}
MenuPanel.java  最左边的JPanel
package View;
import java.awt.Color;
import javax.swing.ImageIcon;
import javax.swing.JPanel;
import View.Icons.MessageIconPanel;
import View.Icons.PictureIconPanel;
/**
* 菜单面板
*
* @author Seven <[e-mail]>
* @date 2016年10月22日
* @version 1.0
*/
public class MenuPanel extends JPanel {
private static final long serialVersionUID = 1L;
private PictureIconPanel pictureIconPanel;
private MessageIconPanel messageIconPanel;
public MenuPanel() {
this.setBackground(new Color(62, 62, 64));
this.setLayout(null);
this.setPictureIconPanel(new ImageIcon("D:\\Coding\\Java\\workspace\\WeChat\\files\\pictures\\a.jpg"));
}
public void setPictureIconPanel(ImageIcon picture) {
this.pictureIconPanel = new PictureIconPanel(27, 27, picture);
this.pictureIconPanel.setBounds(11, 12, this.pictureIconPanel.getWidth(), this.pictureIconPanel.getHeight());
this.add(this.pictureIconPanel);
}
/**
* 设置消息图标面板
*/
public void setMessageIconPanel() {
}
}
Test.java  测试WeChatFrame
package View;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import View.Icons.PictureIconPanel;
public class TEST{
public static void main(String[] args) {
new WeChatFrame();
}
}

那么问题来了，、

如果 PicturePanel.java 中 第26行为

this.setPictureIconPanel(null);

面板可以正常显示：

但是把这一行改成

this.setPictureIconPanel(new ImageIcon("D:\\Coding\\Java\\workspace\\WeChat\\files\\pictures\\a.jpg"));

WeChatFrame中的所有组件都会丢失。

更神奇的是如果把窗口最小化再最大化，丢失的组件会自动出现。

在异常显示(也就是空白面板)上面截图，截完图之后丢失的组件也会神奇的再现。

求大神帮忙分析下原因，谢谢！