字典類的get()方法 (Dictionary 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 get the value on the specified key element (key_ele) in this dictionary.

  get()方法用于獲取此字典中指定鍵元素(key_ele)的值。

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

  get()方法是一種非靜態(tài)方法，可通過類對象訪問，如果嘗試使用類名稱訪問該方法，則會收到錯誤消息。

• get() method does not throw an exception at the time of returning the value of the given key.

  返回給定鍵的值時， get()方法不會引發(fā)異常。

Syntax:

句法：

public abstract Value get(Object key_ele);

Parameter(s):

參數(shù)：

• Object key_ele – represents key element (key_ele) and sets null when key element does not have value.

  對象key_ele –表示關(guān)鍵元素(key_ele)，當(dāng)關(guān)鍵元素沒有值時將其設(shè)置為null。

Return value:

返回值：

The return type of this method is Value, it gets value on the given key element (key_ele) in this dictionary.

此方法的返回類型為Value ，它獲取此字典中給定鍵元素(key_ele)的值。

Example:

例：

// Java program is to demonstrate the example // of get() method of Dictionaryimport java.util.*;public class GetOfDictionary {public static void main(String[] args) {// Instantiate a Hashtable objectDictionary dictionary = new Hashtable();// By using put() method is to// add an elements in Hashtable dictionary.put(1, "C");dictionary.put(2, "C++");dictionary.put(3, "JAVA");dictionary.put(4, "PHP");dictionary.put(5, "SFDC");// Display Hashtable elementsSystem.out.println("dictionary: " + dictionary);// By using get() method is to return// the value associated for the given// key element (key_ele) if existsObject val_ele = dictionary.get(3);// Display val_eleSystem.out.println("dictionary.get(3): " + val_ele);} }

Output

輸出量

dictionary: {5=SFDC, 4=PHP, 3=JAVA, 2=C++, 1=C} dictionary.get(3): JAVA

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

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