Java中的 ArrayDeque removeLast() 方法

Java.util.ArrayDeque.removeLast()方法用于移除 Deque 的最后一个元素。

句法：

Array_Deque.removeLast()

参数：该方法不带任何参数。

返回值：该方法返回 Deque 删除后的最后一个元素。

异常：如果双端队列为空，该方法将抛出NoSuchElementException 。

下面的程序说明了Java.util.ArrayDeque.removeLast() 方法：

方案一：

// Java code to illustrate removeLast()
import java.util.*;
  
public class ArrayDequeDemo {
    public static void main(String args[])
    {
        // Creating an empty ArrayDeque
        Deque de_que = new ArrayDeque();
  
        // Use add() method to add elements into the Deque
        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 removeLast() method
        de_que.removeLast();
        de_que.removeLast();
        de_que.removeLast();
  
        // Displaying the ArrayDeque after removal
        System.out.println("ArrayDeque after removing "
                           + "elements: " + de_que);
    }
}

输出：

Initial ArrayDeque: [Welcome, To, Geeks, For, Geeks]
ArrayDeque after removing elements: [Welcome, To]

方案二：

// Java code to illustrate removeLast()
import java.util.*;
  
public class ArrayDequeDemo {
    public static void main(String args[])
    {
        // Creating an empty ArrayDeque
        Deque de_que = new ArrayDeque();
  
        // 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 removeLast() method
        de_que.removeLast();
        de_que.removeLast();
  
        // Displaying the ArrayDeque after removal
        System.out.println("ArrayDeque after removing "
                           + "elements: " + de_que);
    }
}

输出：

Initial ArrayDeque: [10, 15, 30, 20, 5]
ArrayDeque after removing elements: [10, 15, 30]