Java中的 LinkedTransferQueue removeAll() 方法及示例

Java .util.concurrent.LinkedTransferQueue 的removeAll()方法是Java的一个内置函数，用于从该队列中删除指定集合中包含的所有元素。

句法：

public boolean removeAll(Collection c)

参数：此方法将集合 c 作为参数，其中包含要从此列表中删除的元素。

返回：如果此列表因调用而更改，则此方法返回 true。

异常：如果此列表包含空元素，则空指针异常。

下面的程序说明了 LinkedTransferQueue 类的 removeAll()函数：

方案一：

// Java code to illustrate
// removeAll() method of LinkedTransferQueue
  
import java.util.concurrent.LinkedTransferQueue;
import java.util.*;
  
public class GFG {
    public static void main(String[] args)
        throws InterruptedException
    {
  
        // create object of LinkedTransferQueue
        LinkedTransferQueue LTQ
            = new LinkedTransferQueue();
  
        // Add numbers to end of LinkedTransferQueue
        // using add() method
        LTQ.add("GeeksforGeeks");
        LTQ.add("Geeks");
        LTQ.add("Computer Science");
        LTQ.add("Portal");
        LTQ.add("Gfg");
  
        // Print the Queue
        System.out.println("Linked Transfer Queue : "
                           + LTQ);
  
        // Get the ArrayList to be deleted
        ArrayList arraylist
            = new ArrayList();
        arraylist.add("GeeksforGeeks");
        arraylist.add("Gfg");
        arraylist.add("hack");
  
        // Print ArrayList
        System.out.println("ArrayList to be deleted : "
                           + arraylist);
  
        // Removing elements from the queue
        // which are common to arraylist
        // using removeAll() method.
        LTQ.removeAll(arraylist);
  
        // Prints the Queue
        System.out.println("Linked Transfer Queue "
                           + "after removal of ArrayList : "
                           + LTQ);
    }
}

输出：

Linked Transfer Queue : [GeeksforGeeks, Geeks, Computer Science, Portal, Gfg]
ArrayList to be deleted : [GeeksforGeeks, Gfg, hack]
Linked Transfer Queue after removal of ArrayList : [Geeks, Computer Science, Portal]

方案二：

// Java code to illustrate
// removeAll() method of LinkedTransferQueue
  
import java.util.concurrent.LinkedTransferQueue;
import java.util.*;
  
public class GFG {
    public static void main(String[] args)
        throws InterruptedException
    {
  
        // create object of LinkedTransferQueue
        LinkedTransferQueue LTQ
            = new LinkedTransferQueue();
  
        // Add numbers to end of LinkedTransferQueue
        // using add() method
        LTQ.add(3);
        LTQ.add(6);
        LTQ.add(10);
        LTQ.add(125);
        LTQ.add(205);
  
        // print the Queue
        System.out.println("Linked Transfer Queue : "
                           + LTQ);
  
        // Get the ArrayList to be deleted
        ArrayList arraylist
            = new ArrayList();
        arraylist.add(10);
        arraylist.add(100);
        arraylist.add(125);
  
        // Print ArrayList
        System.out.println("ArrayList to be deleted : "
                           + arraylist);
  
        // Removing elements from the queue
        // which are common to arraylist
        // using removeAll() method.
        LTQ.removeAll(arraylist);
  
        // Prints the Queue
        System.out.println("Linked Transfer Queue "
                           + "after removal of ArrayList : "
                           + LTQ);
    }
}

输出：

Linked Transfer Queue : [3, 6, 10, 125, 205]
ArrayList to be deleted : [10, 100, 125]
Linked Transfer Queue after removal of ArrayList : [3, 6, 205]

参考： https://docs.oracle.com/javase/9/docs/api/ Java/util/concurrent/LinkedTransferQueue.html#removeAll-java.util.Collection-