weakhashmap

WeakHashMap類的get()方法 (WeakHashMap 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 to which the given key element (key_ele) associated in this map otherwise it returns null.

  get()方法用于獲取與此映射中關聯的給定鍵元素(key_ele)關聯的值，否則返回null。

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

  返回給定鍵元素(key_ele)的值時， get()方法不會引發異常。

Syntax:

句法：

public Object get(Object key_ele);

Parameter(s):

參數：

• Object key_ele – represents the key element (key_ele) whose mapping is to be retrieved.

  對象key_ele –表示要檢索其映射的鍵元素(key_ele)。

Return value:

返回值：

The return type of the method is Object, it returns key element (key_ele) value when it exists otherwise it returns null.

該方法的返回類型為Object ，如果存在則返回鍵元素(key_ele)的值，否則返回null。

Example:

例：

// Java program to demonstrate the example // of Object get(Object key_ele) method of WeakHashMap import java.util.*;public class GetOfWeakHashMap {public static void main(String[] args) {// Instantiates a WeakHashMap objectMap < Integer, String > map = new WeakHashMap < Integer, String > ();// By using put() method is to add// key-value pairs in a WeakHashMapmap.put(10, "C");map.put(20, "C++");map.put(50, "JAVA");map.put(40, "PHP");map.put(30, "SFDC");// Display WeakHashMapSystem.out.println("WeakHashMap: " + map);// By using get() method is to return// the value associated for the given// key element exists in this WeakHashMapObject val_ele = map.get(50);// Display val_eleSystem.out.print("map.get(50): ");System.out.println(val_ele);} }

Output

輸出量

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

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

weakhashmap

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