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

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

  rehash()方法在java.util包中可用。

• rehash() method is used to extend the capacity and it is invoked implicitly if the number of keys limit exceeds hashtable capacity.

  rehash()方法用于擴(kuò)展容量，如果鍵數(shù)限制超過(guò)哈希表容量，則會(huì)隱式調(diào)用該方法。

• rehash() 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.

  rehash()方法是一種非靜態(tài)方法，只能通過(guò)類對(duì)象訪問(wèn)，如果嘗試使用類名稱訪問(wèn)該方法，則會(huì)收到錯(cuò)誤消息。

• rehash() method does not throw an exception at the time of extending capacity.

  rehash()方法在擴(kuò)展容量時(shí)不會(huì)引發(fā)異常。

Syntax:

句法：

public void rehash();

Parameter(s):

參數(shù)：

• It does not accept any parameter.

  它不接受任何參數(shù)。

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(nèi)容。

Example:

例：

// Java program to demonstrate the example // of void rehash() method of Hashtable import java.util.*;public class RehashOfHashtable extends Hashtable {public static void main(String[] args) {//Instantiate a hashtable object RehashOfHashtable ht = new RehashOfHashtable();// 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 rehash() method is to increase// the capacity and re-organizes internally// this Hashtableht.rehash();System.out.println("ht.size(): " + ht.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-rehash-method-with-example.aspx

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