hashset java

HashSet類的clear()方法 (HashSet Class clear() method)

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

  clear()方法在java.util包中可用。

• clear() method is used to clear all of the element exists from this HashSet.

  clear()方法用于清除此HashSet中存在的所有元素。

• clear() 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.

  clear()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。

• clear() method does not throw an exception at the time of clearing elements.

  clear()方法在清除元素時不會引發異常。

Syntax:

句法：

public void clear();

Parameter(s):

參數：

• It does not accept any parameter.

  它不接受任何參數。

Return value:

返回值：

The return type of the method is void, it returns nothing.

該方法的返回類型為void ，不返回任何內容。

Example:

例：

// Java program to demonstrate the example // of void clear() method of HashSet import java.util.*;public class ClearOfHashSet {public static void main(String[] args) {// Instantiates a HashSet objectHashSet < String > hs = new HashSet < String > ();// By using add() method is to add// the given object of this HashSet hs.add("C");hs.add("C++");hs.add("JAVA");hs.add("PHP");hs.add("SFDC");// Display HashSetSystem.out.println("HashSet: " + hs);// By using clear() method is to// remove all of the elements exists// in this HashSeths.clear();//Display Modified HashSetSystem.out.println("hs.clear(): " + hs);} }

Output

輸出量

HashSet: [JAVA, C++, C, SFDC, PHP] hs.clear(): []

翻譯自: https://www.includehelp.com/java/hashset-clear-method-with-example.aspx

hashset java

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