哈希表類size()方法 (Hashtable Class size() method)

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

  size()方法在java.util包中可用。

• size() method is used to return the number of key-value pairs that exist in this Hashtable.

  size()方法用于返回此哈希表中存在的鍵值對的數量。

• size() 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.

  size()方法是一種非靜態方法，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。

• size() method does not throw an exception at the time of returning size.

  返回size時， size()方法不會引發異常。

Syntax:

句法：

public int size();

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 int, it returns the number of key-value pairs exists in this Hashtable.

方法的返回類型為int ，它返回此哈希表中存在的鍵值對的數量。

Example:

例：

// Java program to demonstrate the example // of int size() method of Hashtable import java.util.*;public class SizeOfHashtable {public static void main(String[] args) {// Instantiate a hashtable object Hashtable ht = new Hashtable();// By using put() method is to// add the linked values in an// Hashtable htht.put(10, "C");ht.put(20, "C++");ht.put(30, "JAVA");ht.put(40, "PHP");ht.put(50, "SFDC");// Display HashtableSystem.out.println("Hashtable: " + ht);// By using size() method is to// return the size of this Hashtableint size = ht.size();System.out.println("ht.size(): " + size);} }

Output

輸出量

Hashtable: {10=C, 20=C++, 30=JAVA, 40=PHP, 50=SFDC} ht.size(): 5

翻譯自: https://www.includehelp.com/java/hashtable-size-method-with-example.aspx

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