OnJava8-Examples/containersindepth/DequeTest.java

// containersindepth/DequeTest.java
import com.mindviewinc.util.*;

public class DequeTest {
  static void fillTest(Deque<Integer> deque) {
    for(int i = 20; i < 27; i++)
      deque.addFirst(i);
    for(int i = 50; i < 55; i++)
      deque.addLast(i);
  }
  public static void main(String[] args) {
    Deque<Integer> di = new Deque<>();
    fillTest(di);
    System.out.println(di);
    while(di.size() != 0)
      System.out.print(di.removeFirst() + " ");
    System.out.println();
    fillTest(di);
    while(di.size() != 0)
      System.out.print(di.removeLast() + " ");
  }
}
/* Output:
[26, 25, 24, 23, 22, 21, 20, 50, 51, 52, 53, 54]
26 25 24 23 22 21 20 50 51 52 53 54
54 53 52 51 50 20 21 22 23 24 25 26
*/