Why Chinese characters not showing up in JLabel correctly , sometimes ?

I have a large program which uses a JLabel to display some Chinese characters in html, it was doing fine until the program grew larger and larger, then only html fonts in certain sizes will show up correctly, other sizes of the same fonts will show up as rectangles. It's not because it doesn't have these fonts, but it seems to be related to the complexity of the program. If I change the characters in rectangles to a different size ( smaller or larger ), they might show up correctly again (in the large program).
I have a small test program below to see if a particular font size would show up correctly, they all showed up fine in this test, but if I try to display the same html in my large program, some sizes of characters will go wrong. I've even printed out the unicode and looked at them (6309 4f60 7684 9700 8981 ...), they are definitely in the Chinese character range.
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class Java_Test extends JPanel
static int Total=900;
JComboBox ComboBox_Array[]=new JComboBox[Total];
Font Times_New_Roman_15_Font=new Font("Times New Roman",0,15);
static int Small_Chinese_Font_Size=3;
static String Software_Info_Chinese_Text="<Html><Table Width=100% Border=0 Cellpadding=2 Cellspacing=3><Tr><Td Align=Center><Font Size=6 Color=#3737FF>[ \u4EA7\u54C1\u7BA1\u7406 ] </Font></Td></Tr>"+
                                           "<Tr><Td Align=Center><Font Size=5 Color=green>\u5E2E\u52A9\u4F60\u7BA1\u7406\u4EA7\u54C1, \u5408\u540C, \u53CA\u5176\u5B83\u4FE1\u606F :</Font></Td></Tr>"+
                                           "<Tr><Td>\u8F93\u5165<Font Size="+Small_Chinese_Font_Size+" Color=#2255BB>"+
                                             "<li>\u8F93\u5165, \u7EF4\u62A4\u548C\u6253\u5370\u8BE6\u7EC6\u4EA7\u54C1\u53CA\u4F9B\u8D27\u5546\u4FE1\u606F<Br>"+
                                             "<li>\u5730\u5740\u548C\u5907\u6CE8\u4FE1\u606F\u53EF\u7528\u591A\u79CD\u8BED\u8A00\u8F93\u5165<Br>"+
                                           "</Font></Td></Tr>"+
                                           "</Table></Html>";
JPanel Main_Panel=new JPanel();
static boolean Exit_When_Window_Closed=false;
Java_Test(String Test_String)
    for (int i=0;i<Total;i++) ComboBox_Array=new JComboBox();
JLabel A_Non_English_Label=new JLabel(Test_String);
A_Non_English_Label.setFont(Times_New_Roman_15_Font);
A_Non_English_Label.setForeground(Color.BLUE);
add(A_Non_English_Label);
setPreferredSize(new Dimension(600,300));
void Show_Up()
Main_Panel.add(this);
Dimension Screen_Size=Toolkit.getDefaultToolkit().getScreenSize();
final JFrame frame=new JFrame("Java Test");
frame.add(Main_Panel);
frame.addWindowListener(new WindowAdapter()
public void windowClosing(WindowEvent e) { if (Exit_When_Window_Closed) System.exit(0); }
public void windowDeiconified(WindowEvent e) { Main_Panel.repaint(); }
public void windowGainedFocus(WindowEvent e) { Main_Panel.repaint(); }
public void windowOpening(WindowEvent e) { Main_Panel.repaint(); }
public void windowResized(WindowEvent e) { Main_Panel.repaint(); }
public void windowStateChanged(WindowEvent e) { Main_Panel.repaint(); }
frame.pack();
frame.setBounds((Screen_Size.width-Main_Panel.getWidth())/2,(Screen_Size.height-Main_Panel.getHeight())/2-10,Main_Panel.getWidth(),Main_Panel.getHeight()+50);
frame.setVisible(true);
Main_Panel.updateUI();
static void Out(String message) { System.out.println(message); }
public static void main(String[] args)
Exit_When_Window_Closed=true;
new Java_Test(Software_Info_Chinese_Text).Show_Up();
final Java_Test demo=new Java_Test(Software_Info_Chinese_Text);
Dimension Screen_Size=Toolkit.getDefaultToolkit().getScreenSize();
final JFrame frame=new JFrame("Java Test");
frame.add(demo);
frame.addWindowListener(new WindowAdapter()
public void windowClosing(WindowEvent e) { System.exit(0); }
public void windowDeiconified(WindowEvent e) { demo.repaint(); }
public void windowGainedFocus(WindowEvent e) { demo.repaint(); }
public void windowOpening(WindowEvent e) { demo.repaint(); }
public void windowResized(WindowEvent e) { demo.repaint(); }
public void windowStateChanged(WindowEvent e) { demo.repaint(); }
frame.pack();
frame.setBounds((Screen_Size.width-demo.getWidth())/2,(Screen_Size.height-demo.getHeight())/2-10,demo.getWidth(),demo.getHeight()+38);
frame.setVisible(true);
I called this test program from my large program, and it won't display correctly, it will only display all sizes of characters correctly if I run the test program by itself.
I've posted a similar question in Java/Swing but got no answer. So I'm trying it here. The above test program will compile and run, it can display all sizes of html fonts correctly.Which means it's not lacking any fonts. I've even tried the following in my large program :
dialog.validate();
dialog.repaint();
pane.validate();
pane.repaint();
pane.updateUI();
A_Label.validate();
A_Label.repaint();
A_Label.updateUI();
Still doesn't work, does anyone know why and how to fix it ?
Frank

I've just made a breakthrough, the large program will work correctly if I comment out : A_Non_English_Label.setFont(Times_New_Roman_15_Font);
But then the font doesn't look the way I wanted it to be.
So I changed it to the following :
================================================
Font Courier_New_15_Font=new Font("Courier New",0,15);
A_Non_English_Label.setFont(Courier_New_15_Font);
================================================
Now it looks not the same but similar to the way I wanted. Thus my question becomes : why it can't work correctly with "Times_New_Roman", but with "Courier_New" in the large program, they both displayed correctly in my small test program ? Is it because it takes too much resource to load the "Times_New_Roman" font ?
Frank

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In my program there is a JLabel that displays Chinese characters in several sizes of fonts, it was displaying all of them correctly until my program grew larger and takes longer to initialize, now it is only displaying some sizes of fonts correctly while displaying others as rectangles. Since my program is too large to be imported here, I am trying to demo the problem in a smaller program, but in this smaller program, all sizes of fonts showed up correctly, here it is :
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