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Why do I keep on getting "cannot resolve symbol class Scanner" even though I have import java.util.Scanner; at the top of the file? Please help

because there is no class java.util.Scanner in the class path.

I downloaded java JDK, then I reintalled TextPad. The program works. I didn't set the class path yet. Why?

The java.util sources and of all the classes they are in
the file src.zip, which this in the folder where you installed the
JDK.
you can use java.util.Vector and java.util.HashTable...