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package chap03;

class Id {

private static int counter = 0;

private int id;

public Id() {id == ++counter; }

public int getId() {return id; }

public static int getCounter() { return counter; }

}

public class IdTester {

public static void main(String[] args) {

Id a = new Id();

Id b = new Id();

System.out.println("a의 아이디 : " + a.getId());

System.out.println("b의 아이디 : " + b.getId());

System.out.println("부여한 아이디의 개수 : " + Id.getCounter());

}

}