Java: Use import or explicit package / class name?

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There is no real difference; the generated byte code will be exactly the same. An import statement is really just a way to tell the compiler “when I write JFrame, I actually mean javax.swing.JFrame“.

You might want to use fully-qualified package names if you have for example two classes with the same name in different packages. One common example from the standard library are the classes java.util.Date and java.sql.Date.

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