LinkedHashMap類的clear()方法 (LinkedHashMap Class clear() method)

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

  clear()方法在java.util包中可用。

• clear() method is used to remove all the existing elements from this LinkedHashMap.

  clear()方法用于從此LinkedHashMap中刪除所有現有元素。

• clear() 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.

  clear()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。

• clear() method does not throw an exception at the time of clearing this LinkedHashMap.

  在清除此LinkedHashMap時， clear()方法不會引發異常。

Syntax:

句法：

public void clear();

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 void, it returns nothing.

該方法的返回類型為void ，不返回任何內容。

Example:

例：

// Java program to demonstrate the example // of void clear() method of LinkedHashMap import java.util.*;public class ClearOfLinkedHashMap {public static void main(String[] args) {// Instantiates a LinkedHashMap objectMap < Integer, String > map = new LinkedHashMap < Integer, String > ();// By using put() method is to add// key-value pairs in a LinkedHashMapmap.put(10, "C");map.put(20, "C++");map.put(50, "JAVA");map.put(40, "PHP");map.put(30, "SFDC");// Display LinkedHashMapSystem.out.println("LinkedHashMap: " + map);// By using clear() method is// to remove the mappings exists// in this LinkedHashMapmap.clear();System.out.print("map.clear(): ");System.out.println(map);} }

Output

輸出量

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

翻譯自: https://www.includehelp.com/java/linkedhashmap-clear-method-with-example.aspx

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