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Java ConcurrentLinkedDeque add()用法及代码示例


java.util.concurrent.ConcurrentLinkedDeque.add()是Java中的内置函数,它将指定的元素插入双端队列的末尾。

用法:

conn_linked_deque.add(elem)

参数:该方法仅接受要添加到ConcurentLinkedDeque尾部的单个参数elem。


返回值:该函数没有返回值。

异常:当传递给函数的参数为​​null时,该方法将引发NullPointerException。由于其有限的性质,此方法将永远不会引发IllegalStateException或返回false。

以下示例程序旨在说明ConcurrentLinkedDeque.add()方法:

示例1:该程序涉及一个Integer类型的ConcurrentLinkedDeque。

// Java Program Demonstrate add() 
// method of ConcurrentLinkedDeque  
  
import java.util.concurrent.*; 
  
class ConcurrentLinkedDequeDemo { 
    public static void main(String[] args) 
    { 
        ConcurrentLinkedDeque<Integer> cld =  
                     new ConcurrentLinkedDeque<Integer>(); 
  
        cld.add(12); 
        cld.add(110); 
        cld.add(55); 
        cld.add(76); 
  
        // Displaying the existing LinkedDeque 
        System.out.println("Initial Elements in"
                           + "the LinkedDeque: " + cld); 
  
        // Insert a new element in the  LinkedDeque 
        cld.add(21); 
  
        // Displaying the modified LinkedDeque 
        System.out.println("Initial Elements in"
                           + "the LinkedDeque: " + cld); 
    } 
}
输出:
Initial Elements inthe LinkedDeque: [12, 110, 55, 76]
Initial Elements inthe LinkedDeque: [12, 110, 55, 76, 21]

示例2:当将null作为参数传递给函数时,此程序涉及String类型的ConcurrentLinkedDeque和异常处理。

// Java Program Demonstrate add() 
// method of ConcurrentLinkedDeque  
  
import java.util.concurrent.*; 
  
class ConcurrentLinkedDequeDemo { 
    public static void main(String[] args) 
    { 
        ConcurrentLinkedDeque<String> cld =  
                       new ConcurrentLinkedDeque<String>(); 
  
        cld.add("Gfg"); 
        cld.add("GFG"); 
        cld.add("Geeksforgeeks"); 
        cld.add("Contribute"); 
  
        // Displaying the existing LinkedDeque 
        System.out.println("Initial Elements in"
                           + "the LinkedDeque: " + cld); 
  
        /* Exception thrown when null  
             is passed as parameter*/
        try { 
            cld.add(null); 
        } 
        catch (NullPointerException e) { 
            System.out.println("NullPointerException"
                               + "thrown"); 
        } 
  
        // Insert a new element in the  LinkedDeque 
        cld.add("Geek Classes"); 
        // Displaying the modified LinkedDeque 
        System.out.println("Initial Elements in"
                           + "the LinkedDeque: " + cld); 
    } 
}
输出:
Initial Elements inthe LinkedDeque: [Gfg, GFG, Geeksforgeeks, Contribute]
NullPointerExceptionthrown
Initial Elements inthe LinkedDeque: [Gfg, GFG, Geeksforgeeks, Contribute, Geek Classes]

参考: https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/ConcurrentLinkedDeque.html#add()



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注:本文由纯净天空筛选整理自RICHIK BHATTACHARJEE大神的英文原创作品 ConcurrentLinkedDeque add() method in Java。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。