Java中的 LinkedBlockingDeque removeAll() 方法及示例

LinkedBlockingDeque 的removeAll()方法是Java的一个内置函数，用于从该双端队列中删除指定集合中包含的所有元素。这意味着，这两个集合的所有公共元素都从这个双端队列中删除。
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。
返回值：如果此双端队列因调用而更改，则此方法返回 true。
异常：如果指定的集合为 Null，此方法将引发NULL 指针异常。
下面的程序说明了 LinkedBlockingDeque 类的 removeAll()函数：
示例 1：

Java

// Java Program Demonstrate removeAll()
// 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(11);
        LBD.add(22);
        LBD.add(33);
        LBD.add(44);
 
        // print deque
        System.out.println("Linked Blocking Deque: "
                           + LBD);
 
        // create object of ArrayList collection
        ArrayList ArrLis
            = new ArrayList();
 
        // Add number to ArrayList
        ArrLis.add(55);
        ArrLis.add(11);
        ArrLis.add(23);
        ArrLis.add(22);
 
        // print ArrayList
        System.out.println("ArrayList to be removed: "
                           + ArrLis);
 
        // function removeAll() removes all
        // the common elements from deque
        LBD.removeAll(ArrLis);
 
        // print deque
        System.out.println("Current Linked Blocking Deque: "
                           + LBD);
    }
}

输出

Linked Blocking Deque: [11, 22, 33, 44]
ArrayList to be removed: [55, 11, 23, 22]
Current Linked Blocking Deque: [33, 44]

示例 2：

Java

// Java Program Demonstrate removeAll()
// 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("geeks");
        LBD.add("Geeks");
        LBD.add("gfg");
        LBD.add("Gfg");
 
        // print deque
        System.out.println("Linked Blocking Deque: "
                           + LBD);
 
        // create object of ArrayList collection
        ArrayList ArrLis
            = new ArrayList();
 
        // Add number to ArrayList
        ArrLis.add("GeeksforGeeks");
        ArrLis.add("Geeks");
        ArrLis.add("gfg");
        ArrLis.add("Gfg");
 
        // print ArrayList
        System.out.println("ArrayList: "
                           + ArrLis);
 
        // function removeAll() removes all
        // the common elements from deque
        LBD.removeAll(ArrLis);
 
        // print deque
        System.out.println("Linked Blocking Deque: "
                           + LBD);
    }
}

输出

Linked Blocking Deque: [geeks, Geeks, gfg, Gfg]
ArrayList: [GeeksforGeeks, Geeks, gfg, Gfg]
Linked Blocking Deque: [geeks]

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