colobot-data/help/cbot/E/private.txt

\b;Instruction \c;private\n; (for specialists)
This is an access modifier for \l;class\u cbot\class; members. Private members are not accessible outside of the class definition.

\t;Example
\c;
\s;public class MyClass
\s;{
\s;	int    b;                // public by default
\s;	public int a;            // also public 
\s;	private point position;  // private
\s;}
\s;void Test()
\s;{
\s;	MyClass item;
\s;	item.a = item.b = 12;      // ok
\s;	message( item.position );  // this is an error
\s;}
\n;
\t;See also
\c;\l;class\u cbot\class;\n;, \c;\l;public\u cbot\public;\n;, \c;\l;protected\u cbot\protected;\n;
\l;Programming\u cbot;, \l;types\u cbot\type; and \l;categories\u cbot\category;.