Java中的 LinkedBlockingDeque element() 方法

LinkedBlockingDeque的element()方法返回容器前面的元素。它不会删除容器中的元素。此方法返回此双端队列表示的队列的头部。

句法：

public void element()

参数：此方法不接受任何参数。

返回：此方法返回此双端队列表示的队列的头部。

下面的程序说明了 LinkedBlockingDeque 的 element() 方法：

方案一：

Java

// Java Program Demonstrate element()
// method of LinkedBlockingDeque
 
import java.util.concurrent.LinkedBlockingDeque;
import java.util.*;
 
public class GFG {
    public static void main(String[] args)
        throws IllegalStateException
    {
 
        // create object of LinkedBlockingDeque
        LinkedBlockingDeque LBD
            = new LinkedBlockingDeque();
 
        // Add numbers to end of LinkedBlockingDeque
        LBD.add(10);
        LBD.add(20);
        LBD.add(30);
        LBD.add(40);
 
        // before removing print queue
        System.out.println("Linked Blocking Deque: " + LBD);
 
        System.out.println("Linked Blocking Deque front element: " +
                                                     LBD.element());
    }
}

输出：

Linked Blocking Deque: [10, 20, 30, 40]
Linked Blocking Deque front element: 10

方案二：

Java

// Java Program Demonstrate element()
// method of LinkedBlockingDeque
import java.util.concurrent.LinkedBlockingDeque;
import java.util.*;
 
public class GFG {
    public static void main(String[] args)
        throws IllegalStateException
    {
 
        // create object of LinkedBlockingDeque
        LinkedBlockingDeque LBD
            = new LinkedBlockingDeque();
 
        // Add numbers to end of LinkedBlockingDeque
        LBD.add("ab");
        LBD.add("cd");
        LBD.add("fg");
        LBD.add("xz");
 
        // before removing print queue
        System.out.println("Linked Blocking Deque: " + LBD);
 
        System.out.println("Linked Blocking Deque front element: " +
                                                     LBD.element());
    }
}

输出：

Linked Blocking Deque: [ab, cd, fg, xz]
Linked Blocking Deque front element: ab

参考： https: Java/util/concurrent/LinkedBlockingDeque.html#element()