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public class Main {
	public static void klasy(Urzadzenie u)
	{
		u.obliczZnizke();
		u.uruchom();
		u.sprzedarz();
	}
 
	public static void main(String[] args)
	{
		Telefon t = new Telefon();
		klasy(t);
 
		Toster t0 = new Toster();
		klasy(t0);
 
		System.out.println();
		System.out.println(t.toString());
		System.out.println(t0.toString());
	}
 
}

Main.java:2: error: cannot find symbol
	public static void klasy(Urzadzenie u)
	                         ^
  symbol:   class Urzadzenie
  location: class Main
Main.java:11: error: cannot find symbol
		Telefon t = new Telefon();
		^
  symbol:   class Telefon
  location: class Main
Main.java:11: error: cannot find symbol
		Telefon t = new Telefon();
		                ^
  symbol:   class Telefon
  location: class Main
Main.java:14: error: cannot find symbol
		Toster t0 = new Toster();
		^
  symbol:   class Toster
  location: class Main
Main.java:14: error: cannot find symbol
		Toster t0 = new Toster();
		                ^
  symbol:   class Toster
  location: class Main
5 errors

Standard output is empty