Java LinkedTransferQueue removeAll()方法及示例

java.util.concurrent.LinkedTransferQueue的 removeAll() 方法是Java的一个内置函数，用于从这个队列中删除所有包含在指定集合中的元素。

语法

public boolean removeAll(Collection c)

参数： 该方法接受集合c作为参数，其中包含要从这个列表中删除的元素。

返回： 如果这个列表因调用而改变，该方法返回 true。

异常： 如果这个列表包含一个空的元素，则 出现NULL指针异常 。

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

程序1 :

// 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<String> LTQ
            = new LinkedTransferQueue<String>();
  
        // 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<String> arraylist
            = new ArrayList<String>();
        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:

链接传输队列 : [GeeksforGeeks, Geeks, Computer Science, Portal, Gfg]
要删除的ArrayList : [GeeksforGeeks, Gfg, hack]
删除ArrayList后的链接传输队列 : [Geeks, Computer Science, Portal]

程序2 :

// 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<Integer> LTQ
            = new LinkedTransferQueue<Integer>();
  
        // 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<Integer> arraylist
            = new ArrayList<Integer>();
        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]

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