编译不成功

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[root@liyu src]# javac DialogDemo.java
----------
1. WARNING in DialogDemo.java (at line 24)
        public class DialogDemo extends JPanel {
                     ^^^^^^^^^^
The serializable class DialogDemo does not declare a static final serialVersionUID field of type long
----------
2. ERROR in DialogDemo.java (at line 31)
        CustomDialog customDialog;
        ^^^^^^^^^^^^
CustomDialog cannot be resolved to a type
----------
3. ERROR in DialogDemo.java (at line 37)
        customDialog = new CustomDialog(frame, "geisel", this);
        ^^^^^^^^^^^^
customDialog cannot be resolved
----------
4. ERROR in DialogDemo.java (at line 37)
        customDialog = new CustomDialog(frame, "geisel", this);
                           ^^^^^^^^^^^^
CustomDialog cannot be resolved to a type
----------
5. ERROR in DialogDemo.java (at line 38)
        customDialog.pack();
        ^^^^^^^^^^^^
customDialog cannot be resolved
----------
6. ERROR in DialogDemo.java (at line 490)
        customDialog.setLocationRelativeTo(frame);
        ^^^^^^^^^^^^
customDialog cannot be resolved
----------
7. ERROR in DialogDemo.java (at line 491)
        customDialog.setVisible(true);
        ^^^^^^^^^^^^
customDialog cannot be resolved
----------
8. ERROR in DialogDemo.java (at line 493)
        String s = customDialog.getValidatedText();
                   ^^^^^^^^^^^^
customDialog cannot be resolved
----------
9. WARNING in DialogDemo.java (at line 517)
        label.setFont(label.getFont().deriveFont(font.PLAIN,
                                                      ^^^^^
The static field Font.PLAIN should be accessed in a static way
----------
9 problems (7 errors, 2 warnings)[root@liyu src]# ls
CustomDialog.java DialogDemo.java images
[root@liyu src]# javac CustomDialog.java
----------
1. WARNING in CustomDialog.java (at line 9)
        class CustomDialog extends JDialog
              ^^^^^^^^^^^^
The serializable class CustomDialog does not declare a static final serialVersionUID field of type long
----------
2. ERROR in CustomDialog.java (at line 14)
        private DialogDemo dd;
                ^^^^^^^^^^
DialogDemo cannot be resolved to a type
----------
3. ERROR in CustomDialog.java (at line 31)
        public CustomDialog(Frame aFrame, String aWord, DialogDemo parent) {
                                                        ^^^^^^^^^^
DialogDemo cannot be resolved to a type
----------
4. ERROR in CustomDialog.java (at line 33)
        dd = parent;
        ^^
dd cannot be resolved
----------
5. ERROR in CustomDialog.java (at line 137)
        dd.setLabel("It's OK. "
        ^^
dd cannot be resolved
----------
5 problems (4 errors, 1 warning)[root@liyu src]# ls
CustomDialog.java DialogDemo.java images
[root@liyu src]#