element 項目 示例
ArrayDeque類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()方法用于檢索雙端隊列的第一個元素,但不從此雙端隊列中刪除該元素。
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()方法是一個非靜態方法,只能通過類對象訪問,如果嘗試使用類名稱訪問該方法,則會收到錯誤消息。
element() Method may throw an exception at the time of retrieving element.
element()方法在檢索element時可能會引發異常。
NoSuchElementException: This exception may throw when the deque is “blank” (i.e. Deque contains no elements). NoSuchElementException :當雙端隊列為“空白”時(即雙端隊列不包含任何元素),可能會引發此異常。
Syntax:
句法:
public T element();
Parameter(s):
參數:
It does not accept any parameter.
它不接受任何參數。
Return value:
返回值:
The return type of the method is T, it returns first element of this deque.
方法的返回類型為T ,它返回此雙端隊列的第一個元素。
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
輸出量
d_queue :
ArrayDeque Elements = [C, C++, Java, Php, DotNet]d_queue.element() : C
翻譯自: https://www.includehelp.com/java/arraydeque-element-method-with-example.aspx
element 項目 示例