import java.util.*;
 
class TestClass {
	int number = 0;
 
	public TestClass(int number) {
		this.number = number;
	}
	public TestClass() {
	}
}
 
public class Main {
	public static void main(String[] args) {
		TestClass tc0 = new TestClass();
		TestClass tc1 = new TestClass(1);
		TestClass tc2 = new TestClass(2);
 
		ArrayList<TestClass> al = new ArrayList<>();
		al.add(tc0);
		al.add(tc1);
		al.add(tc2);
		for(int i = 0; i < al.size(); i++) {
			System.out.println(al.get(i).number);
		}
	}
}

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