Java LinkedBlockingDeque element()方法

LinkedBlockingDeque 的 element() 方法返回容器中最前面的元素。它不会删除容器中的元素。这个方法返回这个deque所代表的队列的头部。

语法

public void element()

参数： 该方法不接受任何参数。

返回： 该方法返回该deque所代表的队列的头部。

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

程序1 :

// 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<Integer> LBD
            = new LinkedBlockingDeque<Integer>();
 
        // 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

示例2

// 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<String> LBD
            = new LinkedBlockingDeque<String>();
 
        // 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

参考资料: https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/LinkedBlockingDeque.html#element()