element 项目 示例

ArrayDeque类element()方法 (ArrayDeque Class element() method)

• element() Method is available in java.lang package.

  element()方法在java.lang包中可用。

• element() Method is used to retrieve the first element of the deque but without removing the element from this deque.

  element()方法用于检索双端队列的第一个元素，但不从此双端队列中删除该元素。

• element() Method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  element()方法是一个非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。

• element() Method may throw an exception at the time of retrieving element.

  element()方法在检索element时可能会引发异常。

• NoSuchElementException: This exception may throw when the deque is “blank” (i.e. Deque contains no elements). NoSuchElementException ：当双端队列为“空白”时(即双端队列不包含任何元素)，可能会引发此异常。

Syntax:

句法：

    public T element();

Parameter(s):

参数：

• It does not accept any parameter.

  它不接受任何参数。

Return value:

返回值：

The return type of the method is T, it returns first element of this deque.

方法的返回类型为T ，它返回此双端队列的第一个元素。

Example:

例：

// Java program to demonstrate the example
// of T element() method of ArrayDeque
import java.util.*;
public class ElementOfArrayDeque {public static void main(String[] args) {// Creating an ArrayDeque with initial capacity of
// storing elements
ArrayDeque < String > d_queue = new ArrayDeque < String > (10);
// By using add() method to add elements
// in ArrayDeque
d_queue.add("C");
d_queue.add("C++");
d_queue.add("Java");
d_queue.add("Php");
d_queue.add("DotNet");
// Display Deque Elements
System.out.println("d_queue : ");
System.out.println("ArrayDeque Elements = " + d_queue);
System.out.println();
// By using element() method is to return the
// first element of ArrayDeque
String ele = d_queue.element();
System.out.println("d_queue.element() : " + ele);
}
}

Output

输出量

d_queue :
ArrayDeque Elements = [C, C++, Java, Php, DotNet]d_queue.element() : C

翻译自: https://www.includehelp.com/java/arraydeque-element-method-with-example.aspx

element 项目 示例