编译不成功

 [[email protected] src]# javac DialogDemo.java

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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

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2. ERROR in DialogDemo.java (at line 31)

        CustomDialog customDialog;

        ^^^^^^^^^^^^

CustomDialog cannot be resolved to a type

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3. ERROR in DialogDemo.java (at line 37)

        customDialog = new CustomDialog(frame, "geisel", this);

        ^^^^^^^^^^^^

customDialog cannot be resolved

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4. ERROR in DialogDemo.java (at line 37)

        customDialog = new CustomDialog(frame, "geisel", this);

                           ^^^^^^^^^^^^

CustomDialog cannot be resolved to a type

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5. ERROR in DialogDemo.java (at line 38)

        customDialog.pack();

        ^^^^^^^^^^^^

customDialog cannot be resolved

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6. ERROR in DialogDemo.java (at line 490)

        customDialog.setLocationRelativeTo(frame);

        ^^^^^^^^^^^^

customDialog cannot be resolved

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7. ERROR in DialogDemo.java (at line 491)

        customDialog.setVisible(true);

        ^^^^^^^^^^^^

customDialog cannot be resolved

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8. ERROR in DialogDemo.java (at line 493)

        String s = customDialog.getValidatedText();

                   ^^^^^^^^^^^^

customDialog cannot be resolved

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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

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9 problems (7 errors, 2 warnings)[[email protected] src]# ls

CustomDialog.java  DialogDemo.java  images

[[email protected] src]# javac CustomDialog.java

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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

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2. ERROR in CustomDialog.java (at line 14)

        private DialogDemo dd;

                ^^^^^^^^^^

DialogDemo cannot be resolved to a type

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3. ERROR in CustomDialog.java (at line 31)

        public CustomDialog(Frame aFrame, String aWord, DialogDemo parent) {

                                                        ^^^^^^^^^^

DialogDemo cannot be resolved to a type

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4. ERROR in CustomDialog.java (at line 33)

        dd = parent;

        ^^

dd cannot be resolved

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5. ERROR in CustomDialog.java (at line 137)

        dd.setLabel("It's OK.  "

        ^^

dd cannot be resolved

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5 problems (4 errors, 1 warning)[[email protected] src]# ls

CustomDialog.java  DialogDemo.java  images

[[email protected] src]#