Java BlockingDeque element()用法及代碼示例

BlockingDeque的element()方法返回位於容器前麵的元素。它不會刪除容器中的元素。此方法返回此雙端隊列代表的隊列的頭部。

用法:

public void element()

參數：此方法不接受任何參數。

返回值：此方法返回此雙端隊列代表的隊列的頭部。

注意：BlockingDeque的element()方法已從Java中的LinkedBlockingDeque類繼承。

以下示例程序旨在說明BlockingDeque的element()方法：

示例1:

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

輸出：

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

示例2:

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

輸出：

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

參考： https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/BlockingDeque.html#element()

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