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Do not place your Java files in the Java installation directory. Keep your files elsewhere. If you have set up the environment variables correctly you can compile and run your Java programs anywhere...

I got those errors when compiling on the command line. Something you were advised to do twice and totally ignored.

wlocalc.java:7: cannot find symbol
symbol: class ItemListener
public class wlocalc extends JFrame implements ActionListener, ItemListener {
...