Deque: pop()
import java.util.ArrayDeque; import java.util.Deque; public class Main { public static void main(String args[]) { Deque<String> stack = new ArrayDeque<String>(); Deque<String> queue = new ArrayDeque<String>(); stack.push("A"); stack.push("B"); stack.push("C"); stack.push("D"); while (!stack.isEmpty()) System.out.print(stack.pop() + " "); queue.add("A"); queue.add("B"); queue.add("C"); queue.add("D"); while (!queue.isEmpty()) System.out.print(queue.remove() + " "); } }