public static Object command(Object arg) 
{
    // Our implementation defines this to a no-op.
    return null;
}

This method examines the argument and performs an operation according to the compilers documentation. No specific operation is required.

 public static boolean compileClass(Class oneClass) 
{
    // Never succeed.
    return false;
}

Compile the class named by oneClass.

 public static boolean compileClasses(String classNames) 
{
    // Note the incredibly lame interface.  Always fail.
    return false;
}

Compile the classes whose name matches classNames.

 public static  void disable() 
{

}

Calling Compiler.disable() will cause the compiler to be suspended; provided that a compiler even exists.

 public static  void enable() 
{

}

Calling Compiler.enable() will cause the compiler to resume operation if it was previously disabled; provided that a compiler even exists.