哈希表類的get()方法 (Hashtable Class get() method)

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

  get()方法在java.util包中可用。

• get() method is used to return the value associated with the given key element (key_ele) in this Hashtable.

  get()方法用于返回與此哈希表中給定鍵元素(key_ele)關聯的值。

• get() 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.

  get()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。

• get() method may throw an exception at the time of returning value associated with the given key element (key_ele).

  在返回與給定鍵元素(key_ele)相關的值時， get()方法可能會引發異常。

  NullPointerException This exception may throw when the given key element if null exists.

  NullPointerException如果給定key元素(如果存在null)，則可能引發此異常。

Syntax:

句法：

public Value get(Object key_ele);

Parameter(s):

參數：

• Object key_ele – represents the key element (key_ele) in this Hashtable.

  對象key_ele –表示此哈希表中的鍵元素(key_ele)。

Return value:

返回值：

The return type of the method is Value, it gets value associated with the given key element (key_ele).

該方法的返回類型為Value ，它獲取與給定鍵元素(key_ele)關聯的值。

Example:

例：

// Java program to demonstrate the example // of Value get(Object key_ele) method of Hashtable import java.util.*;public class GetOfHashtable {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 get() method is to return// the value element of the given key// element if exists else it returns nullObject val_ele = ht.get(30);// Display val_eleSystem.out.println("ht.get(30): " + val_ele);} }

Output

輸出量

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

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

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