Java中的ArrayDeque pop()方法

Java.util中的ArrayDeque.pop()方法用于从双端队列中弹出一个元素。该元素从双端队列的顶部弹出并从队列中移除。

语法:

Array_Deque.pop()

参数: 该方法不接受任何参数。

返回值: 此方法返回Deque前面的元素。

异常: 如果双端队列为空，则抛出NoSuchElementException。

以下程序演示了Java.util.ArrayDeque.pop()方法:

程序1：

// Java code to illustrate pop()
import java.util.*;
  
public class ArrayDequeDemo {
    public static void main(String args[])
    {
        // Creating an empty ArrayDeque
        Deque<String> de_que = new ArrayDeque<String>();
  
        // Use add() method to add elements
        de_que.add("Welcome");
        de_que.add("To");
        de_que.add("Geeks");
        de_que.add("For");
        de_que.add("Geeks");
  
        // Displaying the ArrayDeque
        System.out.println("Initial ArrayDeque: " + de_que);
  
        // Removing elements using pop() method
        System.out.println("Popped element: " + de_que.pop());
        System.out.println("Popped element: " + de_que.pop());
  
        // Displaying the ArrayDeque after pop
        System.out.println("Deque after operation "
                           + de_que);
    }
}

Initial ArrayDeque: [Welcome, To, Geeks, For, Geeks]
Popped element: Welcome
Popped element: To
Deque after operation [Geeks, For, Geeks]

程序2：

// Java code to illustrate pop()
import java.util.*;
  
public class ArrayDequeDemo {
    public static void main(String args[])
    {
        // Creating an empty ArrayDeque
        Deque<Integer> de_que = new ArrayDeque<Integer>();
  
        // Use add() method to add elements into the Deque
        de_que.add(10);
        de_que.add(15);
        de_que.add(30);
        de_que.add(20);
        de_que.add(5);
  
        // Displaying the ArrayDeque
        System.out.println("Initial ArrayDeque: " + de_que);
  
        // Removing elements using pop() method
        System.out.println("Popped element: " + de_que.pop());
        System.out.println("Popped element: " + de_que.pop());
  
        // Displaying the ArrayDeque after pop
        System.out.println("Deque after operation "
                           + de_que);
    }
}

Initial ArrayDeque: [10, 15, 30, 20, 5]
Popped element: 10
Popped element: 15
Deque after operation [30, 20, 5]