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1. Java compiler error. Cannot find symbol    stackoverflow.com

Why am I getting this error when the SystemController class is in the same directory? 

sgs$ javac Main.java 

Main.java:27: cannot find symbol
symbol  : class SystemController
location: class sgs.Main
     ...

2. Compiler throw non static method can't be accesed from static context when there is no problem    stackoverflow.com

import javax.swing.JFrame;
import javax.swing.JPanel;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Color;
import java.util.Random;

public class dots {
    public dots() {
        init();
    }
    ...

3. I'm making a GUI Program, but getting a weird error    stackoverflow.com

I made this program for my homework, I have to add one GUI choice to another. The sum of the two choices are not appearing in the Total charges per semester ...

4. Functions in GUI not working properly and funny compiler error    forums.oracle.com

negativ_zero wrote: Hello, I've been on here the last few days getting some help, and I'm back for more! Anyway, I finally got my program to compile, but it came up with two weird errors I've never seen before. They are: Note: C:\InventoryGUI.java uses unchecked or unsafe operations. and Note: Recompile with -Xlint:unchecked for details. I'm not sure what those mean ...