Very basic, explanation about data fields

Hi everyone,
I am new here and I need to undertand the difference between static and nonstatic data fields. In my tutorial it says:
"To help you determine wether a data field should be static or not, you can ask your self how many many times it occurs. If it occurs once per class, it is static. but if it occurs once per object, it is not static".
can anyone explain what that means?

[http://xahlee.org/java-a-day/instance_vs_class_members.html]

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