Java LinkedBlockingDeque clear()方法

LinkedBlockingDeque 的 clear() 方法会清除所有存在于LinkedBlockingDeque容器中的元素。在该函数被调用后，该容器会变成空的。

语法

public void clear()

参数： 该方法不接受任何参数。

返回： 该方法不返回任何东西。

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

程序1 :

// Java Program Demonstrate clear()
// 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(7855642);
        LBD.add(35658786);
        LBD.add(5278367);
        LBD.add(74381793);
  
        // before using erase() function
        System.out.println("Linked Blocking Deque: " + LBD);
  
        LBD.clear();
        // after using erase() function
        System.out.println("Linked Blocking Deque: " + LBD);
    }
}

输出:

Linked Blocking Deque: [7855642, 35658786, 5278367, 74381793]
Linked Blocking Deque: []

示例2

// Java Program Demonstrate clear()
// method of LinkedBlockingDeque
// when the list contains characters
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("1");
        LBD.add("2");
        LBD.add("3");
        LBD.add("4");
  
        // before using erase() function
        System.out.println("Linked Blocking Deque: " + LBD);
  
        LBD.clear();
        // after using erase() function
        System.out.println("Linked Blocking Deque: " + LBD);
    }
}

输出:

Linked Blocking Deque: [1, 2, 3, 4]
Linked Blocking Deque: []

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