java enummap_Java EnumMap size()方法与示例
java enummap
EnumMap類的size()方法 (EnumMap Class size() method)
size() method is available in java.util package.
size()方法在java.util包中可用。
size() method is used to return the size of this enum map (i.e. it returns the number of key-value pairs exists in this enum map).
size()方法用于返回此枚舉映射的大小(即,它返回此枚舉映射中存在的鍵值對的數量)。
size() 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.
size()方法是一種非靜態方法,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。
size() method does not throw an exception at the time of returning the size of this map.
返回此地圖的大小時, size()方法不會引發異常。
Syntax:
句法:
public int size();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 this method is int, it returns the number of key-value mappings exists in this enum map.
此方法的返回類型為int ,它返回此枚舉映射中存在的鍵值映射數。
Example:
例:
// Java program to demonstrate the example // of int size() method of EnumMapimport java.util.*;public class SizeOfEnumMap {public enum Colors {RED,BLUE,PINK,YELLOW};public static void main(String[] args) {// We are creating EnumMap objectEnumMap < Colors, String > em =new EnumMap < Colors, String > (Colors.class);// By using put() method is to// add the linked values in an// EnumMap (em)em.put(Colors.RED, "1");em.put(Colors.BLUE, "2");em.put(Colors.PINK, "3");em.put(Colors.YELLOW, "4");// Display EnumMapSystem.out.println("EnumMap (em) :" + em);// By using size() method isto// return the number of key-value// pairs exists in an EnumMapint size = em.size();// Display Size Of An EnumMapSystem.out.println("em.size(): " + size);} }Output
輸出量
EnumMap (em) :{RED=1, BLUE=2, PINK=3, YELLOW=4} em.size(): 4翻譯自: https://www.includehelp.com/java/enummap-size-method-with-example.aspx
java enummap
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