Before page load

Jdev 11.1.2.3.0
1.     I have a method in a java class which I wanted to execute shortly before the page loads.
2.     Also just like above, I have another method in a java class which I wanted to execute before control passes to an input Text,
How do I call these methods?

Thanks,
1)  I have already implemented my case using method call however, I was thinking that there might be another way to do that.
2) The use case here is that I have some input Text items, when a user navigates to an inputText, the value will be autofill. For Instance, I have a two fields, one with the surname and the second with the first name. When a user navigates to the full name field, it will fill it with the concatenation of surname and first name fields.

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