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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. import java.util.concurrent.atomic.AtomicInteger;
  8.  
  9. abstract class Ticket {
  10.     private static final AtomicInteger ticketCounter = new AtomicInteger();
  11.     private final int ticketId;
  12.  
  13.     public Ticket() {
  14.        this.ticketId = ticketCounter.incrementAndGet();
  15.     }
  16.  
  17.     public int getTicketId() {
  18.         return ticketId;
  19.     }
  20. }
  21.  
  22. class Ticket1 extends Ticket {}
  23. class Ticket2 extends Ticket {}
  24. class Ticket3 extends Ticket {}
  25.  
  26. /* Name of the class has to be "Main" only if the class is public. */
  27. class Ideone
  28. {
  29. 	public static void main (String[] args) throws java.lang.Exception
  30. 	{
  31. 		Ticket1 t1 = new Ticket1();
  32. 		Ticket3 t3 = new Ticket3();
  33. 		Ticket2 t2 = new Ticket2();
  34.         Ticket1 t4 = new Ticket1();
  35.         System.out.println("t1:"+t1.getTicketId());
  36.         System.out.println("t2:"+t2.getTicketId());
  37.         System.out.println("t3:"+t3.getTicketId());
  38.         System.out.println("t4:"+t4.getTicketId());
  39. 	}
  40. }
Success #stdin #stdout 0.07s 380160KB
comments (?)
stdin 
Standard input is empty
stdout 
t1:1
t2:3
t3:2
t4:4
https://ideone.com/Nt8g5k
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
public

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