Ошибка "javac: invalid flag: C:\Users\"

import java.applet.*;
import java.awt.*;
public class Exl extends Applet{
    public boid init()
    {
        resize(350,150);
        setLayout(new FlowLayout(FlowLayout.CENTER.20.30));
        add(new TextArea(5,10));
        add(new operationPanel());
        add(new numberPanel());
    }
}
class numberPanel extends Panel{
    String str[]={"9","8","7","6","5","4","3","2","1","0","F","E","D","C","B","A"};
public numberPanel(  )
{
    setLayout(new GridLayout(4,4));
    for(int i=0;i<str.length;i++)
        add(new Button(str[i]));
        }   
}
class operationPanel extends Panel{
    public operationPanel()
    {
        setLayout(new GridLayout(3,3));
        add(new Button("+"));
        add(new Button("-"));
        add(new Button("*"));
        add(new Button("/"));
        add(new Button("√"));
        add(new Button("^2"));
        add(new Button("←"));
        add(new Button("="));
    }
}

--------------------Configuration: Exl - JDK version 1.6.0_21 <Default> - <Default>--------------------
javac: invalid flag: C:\Users\
Usage: javac <options> <source files>
use -help for a list of possible options
 
Process completed.