Java ArrayDeque clone方法

package com.codingdict;

import java.util.ArrayDeque;
import java.util.Deque;

public class ArrayDequeDemo {
   public static void main(String[] args) {

      // create an empty array deque with an initial capacity
      ArrayDeque<Integer> deque1 = new ArrayDeque<Integer>(8);

      // use add() method to add elements in the deque
      deque1.add(15);
      deque1.add(30);
      deque1.add(20);
      deque1.add(18);

      // clone the first deque,
      Deque<Integer> deque2 = deque1.clone();

      // let us print all the elements available in deque2
      // now deque2 should have similar elements to deque1.
      for (Integer number : deque2) {
         System.out.println("Number = " + number);
      }
   }
}