C:\Users\Jeff\Desktop\ScannerExercise1.java:7: cannot resolve symbol
symbol : class Scanner
location: package util
import java.util.Scanner;
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Anyways I searched around the other topics and could not find anything to help me, if you can help me please guide me step by step cause i'm a noob

thanks in advance
BTW I once had it installed and working but I reinstalled windows so everything was deleted and I forget what I had to do