Re: What do these errors mean?

I've finally got around to compiling my program with -Xlint, as the
compiler kept nagging me to. This is what I got. (I've removed some
entries for different bits that caused identical errors.) I haven't a
clue what any of it means or what to do about it; can anyone enlighten
me? What's a raw type, for instance, and what's a serializable class and
how do you give it a definition of serialVersionUID?
----------------------------------------------
Vectorine.java:39: warning: [rawtypes] found raw type: JComboBox
JComboBox droplist = new JComboBox();
^
missing type arguments for generic class JComboBox<E>
where E is a type-variable:
E extends Object declared in class JComboBox

Vectorine.java:39: warning: [rawtypes] found raw type: JComboBox
JComboBox droplist = new JComboBox();
^
missing type arguments for generic class JComboBox<E>
where E is a type-variable:
E extends Object declared in class JComboBox

Vectorine.java:68: warning: [unchecked] unchecked call to addItem(E) as
a member of the raw type JComboBox
droplist.addItem("Compare to what?");
^
where E is a type-variable:
E extends Object declared in class JComboBox

Vectorine.java:71: warning: [unchecked] unchecked call to addItem(E) as
a member of the raw type JComboBox
droplist.addItem("Other planet");
^
where E is a type-variable:
E extends Object declared in class JComboBox

Vectorine.java:143: warning: [static] static method should be qualified
by type name, DatasetReader, instead of by an expression
datareader.getPlanetPositions(planet);
^
Vectorine.java:145: warning: [static] static variable should be
qualified by type name, DatasetReader, instead of by an expression
for (int count=0; count<datareader.planetPositions.length; count++)
^

Vectorine.java:21: warning: [serial] serializable class Vectorine has no
definition of serialVersionUID
public class Vectorine extends JFrame implements ItemListener,
MouseListener
^
----------------------------------------------
(DatasetReader is another class in my program, which the main class
creates an instance of so it can use its methods to look up data.
Anything else I should explain, just tell me.)
--
Many thanks,
A. B.


My e-mail address is zen177395 at zendotcodotuk, though I don't check
that account very often.
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