Java ConcurrentLinkedDeque clear()方法

java.util.concurrent.ConcurrentLinkedDeque .clear()方法 是Java中的一个内置方法，用于删除Deque中的元素。

语法

public void clear()

参数： 该方法不接受任何参数。

返回值： 该函数不返回任何东西

以下程序说明了 ConcurrentLinkedDeque.clear() 方法。

程序1 :

// Java Program to Demonstrate clear()
// method of ConcurrentLinkedDeque
  
import java.util.concurrent.*;
  
class GFG {
    public static void main(String[] args)
    {
  
        // Creating an empty Deque
        ConcurrentLinkedDeque<String> cld
            = new ConcurrentLinkedDeque<String>();
  
        // Add elements into the Deque
        cld.add("Welcome");
        cld.add("To");
        cld.add("Geeks");
        cld.add("4");
        cld.add("Geeks");
  
        // Displaying the Deque
        System.out.println("ConcurrentLinkedDeque: "
                           + cld);
  
        // Remove all elements of the Deque using clear()
        cld.clear();
  
        // Displaying message
        System.out.println("\nConcurrentLinkedDeque cleared\n");
  
        // Displaying the Deque
        System.out.println("ConcurrentLinkedDeque: "
                           + cld);
    }
}

输出。

ConcurrentLinkedDeque: [Welcome, To, Geeks, 4, Geeks]

ConcurrentLinkedDeque cleared

ConcurrentLinkedDeque: []

计划2。

// Java Program to Demonstrate clear()
// method of ConcurrentLinkedDeque
  
import java.util.concurrent.*;
  
class GFG {
    public static void main(String[] args)
    {
  
        // Creating an empty Deque
        ConcurrentLinkedDeque<Integer> cld
            = new ConcurrentLinkedDeque<Integer>();
  
        // Add elements into the Deque
        cld.add(10);
        cld.add(20);
        cld.add(30);
        cld.add(40);
        cld.add(50);
  
        // Displaying the Deque
        System.out.println("ConcurrentLinkedDeque: "
                           + cld);
  
        // Remove all elements of the Deque using clear()
        cld.clear();
  
        // Displaying message
        System.out.println("\nConcurrentLinkedDeque cleared\n");
  
        // Displaying the Deque
        System.out.println("ConcurrentLinkedDeque: "
                           + cld);
    }
}

输出。

ConcurrentLinkedDeque: [10, 20, 30, 40, 50]

ConcurrentLinkedDeque cleared

ConcurrentLinkedDeque: []

参考资料: https://docs.oracle.com/javase/9/docs/api/java/util/concurrent/ConcurrentLinkedDeque.html#clear-