Java中的Vector contains（）方法-yiteyi-C++库

这个 JAVAutil。矢量。包含（） 方法用于检查向量中是否存在特定元素。所以基本上它是用来检查向量是否包含任何特定的元素。

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语法：

Vector.contains(Object element)

参数： 此方法采用强制参数要素这是一种向量。这是需要测试的元素，如果它是否存在于向量中。

返回值： 此方法返回 符合事实的 如果元素存在于向量中，则返回 错误的 .

下面的程序演示了Java。util。矢量。contains（）方法：

项目1：

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

输出：

Vector: [Welcome, To, Geeks, 4, Geeks]
Does the vector contains 'Geeks'? true
Does the Vector contains '4'? true
Does the Queue contains 'No'? false

项目2：

                     // Java code to illustrate contains()                   
                     import                               java.util.*;                   
                             
                     public                               class                               VectorDemo {                   
                                         public                               static                               void                               main(String args[])                   
                                         {                   
                                         // Creating an empty Vector                   
                                         Vector<Integer> vec_tor =                               new                               Vector<Integer>();                   
                             
                                         // Use add() method to add elements into the Vector                   
                                         vec_tor.add(                               10                               );                   
                                         vec_tor.add(                               15                               );                   
                                         vec_tor.add(                               30                               );                   
                                         vec_tor.add(                               20                               );                   
                                         vec_tor.add(                               5                               );                   
                             
                                         // Displaying the Vector                   
                                         System.out.println(                               "Vector: "                               + vec_tor);                   
                             
                                         // Check for "Geeks" in the Vector                   
                                         System.out.println(                               "Does the vector contains 'Geeks'? "                   
                                         + vec_tor.contains(                               "Geeks"                               ));                   
                             
                                         // Check for "4" in the Vector                   
                                         System.out.println(                               "Does the Vector contains '4'? "                   
                                         + vec_tor.contains(                               "4"                               ));                   
                             
                                         // Check if the vector contains "No"                   
                                         System.out.println(                               "Does the Vector contains 'No'? "                   
                                         + vec_tor.contains(                               "No"                               ));                   
                                         }                   
                     }                   

输出：

Vector: [10, 15, 30, 20, 5]
Does the vector contains 'Geeks'? false
Does the Vector contains '4'? false
Does the Vector contains 'No'? false

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