Java中的 LinkedBlockingDeque clear() 方法

LinkedBlockingDeque的clear()方法会擦除 LinkedBlockingDeque 容器中存在的所有元素。调用函数后容器变为空。

句法：

public void clear()

参数：此方法不接受任何参数

返回：此方法不返回任何内容。

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

方案一：

// 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 LBD
            = new LinkedBlockingDeque();
  
        // 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: []

方案二：

// 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 LBD
            = new LinkedBlockingDeque();
  
        // 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： https: Java/util/concurrent/LinkedBlockingDeque.html#clear()