linkedhashset

LinkedHashSet類contains()方法 (LinkedHashSet 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 the given object (ob) exists or not exists in this LinkedHashSet.

  contains()方法用于檢查給定對象(ob)在此LinkedHashSet中是否存在。

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

  contains()方法是一個非靜態方法，只能通過類對象訪問，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 elements.

  contains()方法在檢查元素時不會引發異常。

Syntax:

句法：

public boolean contains(Object ob);

Parameter(s):

參數：

• Object ob – represents the object to be tested for its existence in this LinkedHashSet.

  對象ob –表示要測試的對象在此LinkedHashSet中是否存在。

Return value:

返回值：

The return type of the method is boolean, it returns true when the given object exists otherwise it returns false.

方法的返回類型為boolean ，當給定對象存在時返回true ，否則返回false 。

Example:

例：

// Java program to demonstrate the example // of boolean contains(Object ob) method of // LinkedHashSet import java.util.*;public class ContainsOfLinkedHashSet {public static void main(String[] args) {// Instantiates a LinkedHashSet objectHashSet < String > hs = new LinkedHashSet < String > ();// By using add() method is to add// the given object of this// LinkedHashSet hs.add("C");hs.add("C++");hs.add("JAVA");hs.add("PHP");hs.add("SFDC");// Display LinkedHashSetSystem.out.println("LinkedHashSet: " + hs);// By using contains() method is to // check whether the given object exists// or not exists in this LinkedHashSetboolean status = hs.contains("JAVA");// Display StatusSystem.out.println("hs.contains(JAVA): " + status);} }

Output

輸出量

LinkedHashSet: [C, C++, JAVA, PHP, SFDC] hs.contains(JAVA): true

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

linkedhashset

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