枚舉類getDeclaringClass()方法 (Enum Class getDeclaringClass() method)

• getDeclaringClass() method is available in java.lang package.

  getDeclaringClass()方法在java.lang包中可用。

• getDeclaringClass() method is used to return the Class object denoting the enum type of this enum constants. Two enum constants can be same if and only if the condition: enum1.getDeclaringClass() == enum2.getDeclaringClass().

  getDeclaringClass()方法用于返回表示此枚舉常量的枚舉類型的Class對象。 當且僅當滿足以下條件時，兩個枚舉常量才能相同： enum1.getDeclaringClass()== enum2.getDeclaringClass() 。

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

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

• getDeclaringClass() method does not throw an exception at the time of returning Class object.

  返回Class對象時， getDeclaringClass()方法不會引發異常。

Syntax:

句法：

public final Class getDeclaringClass();

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 Class, it returns an object of "Class" type denoting the enum type of this enum constants.

此方法的返回類型為Class ，它返回一個“ Class”類型的對象，該對象表示此枚舉常量的枚舉類型。

Example:

例：

// Java program to demonstrate the example // of Class getDeclaringClass() //method of Enum enum Month {JAN,FEB,MAR,APR,MAY; }enum Weeks {SUN,MON,TUE,WED,THU; }public class GetDeclaringClass {public static void main(String args[]) {// By using valueOf() method is to get the enum// value of the given enum constantsMonth m1 = Month.valueOf("JAN");Month m2 = Month.valueOf("FEB");Month m3 = Month.valueOf("MAR");Month m4 = Month.valueOf("APR");Month m5 = Month.valueOf("MAY");Weeks w1 = Weeks.valueOf("SUN");Weeks w2 = Weeks.valueOf("MON");Weeks w3 = Weeks.valueOf("TUE");Weeks w4 = Weeks.valueOf("WED");Weeks w5 = Weeks.valueOf("THU");System.out.println("Display Corresponding class:");System.out.println(m1.name() + " " + m1.getDeclaringClass());System.out.println(m2.name() + " " + m2.getDeclaringClass());System.out.println(m2.name() + " " + m3.getDeclaringClass());System.out.println(w1.name() + " " + w1.getDeclaringClass());System.out.println(w3.name() + " " + w3.getDeclaringClass());}}

Output

輸出量

Display Corresponding class: JAN class Month FEB class Month FEB class Month SUN class Weeks TUE class Weeks

翻譯自: https://www.includehelp.com/java/enum-getdeclaringclass-method-with-example.aspx

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