import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
public class ArrayTest {
	public static void main(String[] args) {
		List<Integer> lstint = new ArrayList<Integer>();
		lstint.add(1);
		lstint.add(2);
                  lstint.add(3);
		// Iterator遍历一
		Iterator<Integer> iterator = lstint.iterator();
		while (iterator.hasNext()) {
			int i = (Integer) iterator.next();
 			System.out.println(i);
		}
		System.out.println();
		// Iterator遍历二
		for (Iterator<Integer> it = lstint.iterator(); it.hasNext();) {
			int i = (Integer) it.next();
			System.out.println(i);
		}
		System.out.println();
		// for循环
		for (int i = 0; i < lstint.size(); i++) {
			System.out.println(lstint.get(i));
		}
		System.out.println();
		// for循环加强版
		for (Integer i : lstint) {
			System.out.println(i);
		}
	}
}