ArrayList類contains()方法 (ArrayList Class contains() method)

• contains() method is available in java.util package.

  contains()方法在java.util包中可用。

• contains() method is used to check whether this Arraylist contains the given object or not.

  contains()方法用于檢查此Arraylist是否包含給定的對象。

• contains() method is a non-static method so it is accessible with the class object and if we try to access the method with the class name then we will get an error.

  contains()方法是一種非靜態(tài)方法，因此可以通過類對象進行訪問，如果嘗試使用類名稱訪問該方法，則會收到錯誤消息。

• contains() method does not throw an exception at the time of checking the given object in this Arraylist.

  在檢查此Arraylist中的給定對象時， contains()方法不會引發(fā)異常。

Syntax:

句法：

public boolean contains(Object obj);

Parameter(s):

參數(shù)：

• Object obj – represents the object to be checked whether exists or not exists in this Arraylist.

  Object obj –表示要檢查的對象是否存在于此Arraylist中。

Return value:

返回值：

The return type of this method is boolean, it returns true if the given object exists in this Arraylist otherwise, it returns false when the given object does not exist in this Arraylist.

此方法的返回類型是布爾值 ，如果在此ArrayList中存在的給定對象，否則返回true，當給定的對象并不在此ArrayList存在返回false。

Example:

例：

// Java program to demonstrate the example // of boolean contains() method of ArrayListimport java.util.*;public class ContainsOfArrayList {public static void main(String[] args) {// Create an ArrayList with initial // capacity of storing elementsArrayList arr_l = new ArrayList(10);// By using add() method is to add // elements in this ArrayListarr_l.add("C");arr_l.add("C++");arr_l.add("JAVA");arr_l.add("DOTNET");arr_l.add("PHP");// Display ArrayListSystem.out.println("ArrayList Elements: " + arr_l);// By using contains(Object) method is to check// the existence of the given objectboolean status = arr_l.contains("C++");// Display status of the given objectSystem.out.println("arr_l.contains(C++): " + status);} }

Output

輸出量

ArrayList Elements: [C, C++, JAVA, DOTNET, PHP] arr_l.contains(C++): true

翻譯自: https://www.includehelp.com/java/arraylist-contains-method-with-example.aspx

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