Java LinkedBlockingDeque retainAll()用法及代码示例

LinkedBlockingDeque的retainAll()方法是Java的内置函数，用于从此双端队列中删除指定集合中包含的所有元素。这意味着，从此双端队列删除了这两个集合的所有公共元素。

用法:

public boolean retainAll(Collection c)

参数：此方法将集合c作为包含要从此列表中删除的元素的参数。

返回值：如果此双端队列由于调用而改变，则此方法返回true。

异常：如果指定的集合为Null，则此方法将引发NULL指针异常。

以下示例程序旨在说明LinkedBlockingDeque类的retainAll()函数：

示例1:

// Java Program Demonstrate retainAll() 
// 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(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<Integer> ArrLis 
            = new ArrayList<Integer>(); 
  
        // Add number to ArrayList 
        ArrLis.add(55); 
        ArrLis.add(11); 
        ArrLis.add(23); 
        ArrLis.add(22); 
  
        // Print ArrayList 
        System.out.println("ArrayList to be retained: "
                           + ArrLis); 
  
        // Function retainAll() retains 
        // all the common elements from deque 
        LBD.retainAll(ArrLis); 
  
        // Print deque 
        System.out.println("Retained Linked Blocking Deque: "
                           + LBD); 
    } 
}

输出：

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

示例2:

// Java Program Demonstrate retainAll() 
// 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<String> LBD 
            = new LinkedBlockingDeque<String>(); 
  
        // 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<String> ArrLis 
            = new ArrayList<String>(); 
  
        // Add elements to ArrayList 
        ArrLis.add("GeeksforGeeks"); 
        ArrLis.add("Geeks"); 
        ArrLis.add("gfg"); 
        ArrLis.add("Gfg"); 
  
        // Print ArrayList 
        System.out.println("ArrayList to be retained: "
                           + ArrLis); 
  
        // Function retainAll() retains 
        // all the common elements from deque 
        LBD.retainAll(ArrLis); 
  
        // Print deque 
        System.out.println("Retained Linked Blocking Deque: "
                           + LBD); 
    } 
}

输出：

Linked Blocking Deque: [geeks, Geeks, gfg, Gfg]
ArrayList to be retained: [GeeksforGeeks, Geeks, gfg, Gfg]
Retained Linked Blocking Deque: [Geeks, gfg, Gfg]

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

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注：本文由纯净天空筛选整理自ProgrammerAnvesh大神的英文原创作品 LinkedBlockingDeque retainAll() method in Java with Examples。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。