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It is much more convenient and cleaner to use a single statement like
import java.awt.*;
than to import a bunch of individual classes
import java.awt.Panel;
import java.awt.Graphics;
import java.awt.Canvas;
...
What is wrong with using a wildcard in the import statement?
Performance: No impact on performance as byte code is same. though it will lead to some compile overheads.
Compilation: on my personal machine, Compiling a blank class without importing anything takes 100 ms but same class when import java.* takes 170 ms.