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How do I automacially assign a variable in constructor while creating objects
final class Foo {
  private static final AtomicInteger seed = new AtomicInteger();
  private final int id;

  public Foo() {
    this.id = seed.incrementAndGet();
  }
}

public class YourClass {
    private static int generalIdCount = 0;
    private int id;

    public YourClass() {
        this.id = generalIdCount;
        generalIdCount++;
    }
}

class Person {
    private static int nextId = 1;
    private final int id;

    Person() {
        id = nextId++;
    }
}

public class Person {

    // same across all instances of this class
    static int currentCounter = 0;

    // only for this instance
    int personId;

    public Person(){
        personId = currentCounter;
        currentCounter++;
    }
}

public class Person{
    public static int Increment = 1;

    public int ID;
    public Person(){
        this.ID = Increment;
        Increment++;
    }
}