Java中的ArrayDeque contains（）方法-yiteyi-C++库

爪哇。util。ArrayDeque。Java中的contains（）方法用于检查或验证Deque中是否存在特定元素。

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语法：

Array_Deque.contains(Object element)

参数： 参数要素属于ArrayDeque类型。这是需要测试的元素，如果它是否存在于deque中。

返回值： 如果deque中存在元素，则该方法返回True，否则返回False。

下面的程序演示了Java。util。ArrayDeque。contains（）方法： 项目1：

                     // Java code to illustrate contains()                   
                     import                               java.util.*;                   
                             
                     public                               class                               ArrayDequeDemo {                   
                                         public                               static                               void                               main(String args[])                   
                                         {                   
                                         // Creating an empty ArrayDeque                   
                                         Deque<String> de_que =                               new                               ArrayDeque<String>();                   
                             
                                         // Use add() method to add elements into the Queue                   
                                         de_que.add(                               "Welcome"                               );                   
                                         de_que.add(                               "To"                               );                   
                                         de_que.add(                               "Geeks"                               );                   
                                         de_que.add(                               "4"                               );                   
                                         de_que.add(                               "Geeks"                               );                   
                             
                                         // Displaying the ArrayDeque                   
                                         System.out.println(                               "ArrayDeque: "                               + de_que);                   
                             
                                         // Check for "Geeks" in the deque                   
                                         System.out.println(                               "Does the deque contains 'Geeks'? "                   
                                         + de_que.contains(                               "Geeks"                               ));                   
                             
                                         // Check for "4" in the deque                   
                                         System.out.println(                               "Does the deque contains '4'? "                   
                                         + de_que.contains(                               "4"                               ));                   
                             
                                         // Check if the deque contains "No"                   
                                         System.out.println(                               "Does the deque contains 'No'? "                   
                                         + de_que.contains(                               "No"                               ));                   
                                         }                   
                     }                   

输出：

ArrayDeque: [Welcome, To, Geeks, 4, Geeks]
Does the deque contains 'Geeks'? true
Does the deque contains '4'? true
Does the deque contains 'No'? false

项目2：

                     // Java code to illustrate contains()                   
                     import                               java.util.*;                   
                             
                     public                               class                               ArrayDequeDemo {                   
                                         public                               static                               void                               main(String args[])                   
                                         {                   
                                         // Creating an empty ArrayDeque                   
                                         Deque<Integer> de_que =                               new                               ArrayDeque<Integer>();                   
                             
                                         // Use add() method to add elements into the Queue                   
                                         de_que.add(                               10                               );                   
                                         de_que.add(                               15                               );                   
                                         de_que.add(                               30                               );                   
                                         de_que.add(                               20                               );                   
                                         de_que.add(                               5                               );                   
                             
                                         // Displaying the ArrayDeque                   
                                         System.out.println(                               "ArrayDeque: "                               + de_que);                   
                             
                                         // Check for '15' in the Deque                   
                                         System.out.println(                               "Does the Deque contains '15'? "                   
                                         + de_que.contains(                               15                               ));                   
                             
                                         // Check for '2' in the Deque                   
                                         System.out.println(                               "Does the Deque contains '2'? "                   
                                         + de_que.contains(                               2                               ));                   
                             
                                         // Check if the Deque contains '10'                   
                                         System.out.println(                               "Does the Deque contains '10'? "                   
                                         + de_que.contains(                               10                               ));                   
                                         }                   
                     }                   

输出：

ArrayDeque: [10, 15, 30, 20, 5]
Does the Deque contains '15'? true
Does the Deque contains '2'? false
Does the Deque contains '10'? true

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