enum ordinal

枚举类ordinal()方法 (Enum Class ordinal() method)

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

  ordinal()方法在java.lang包中可用。

• ordinal() method is used to return the position of this enum constants is whatever defined in its enum declaration and the position of starting element of enum constant starts from 0.

  ordinal()方法用于返回此枚举常量的位置，无论其枚举声明中定义了什么，并且枚举常量的起始元素的位置均从0开始。

• ordinal() 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.

  ordinal()方法是一种非静态方法，只能通过类对象进行访问，如果尝试使用类名称访问该方法，则会收到错误消息。

• ordinal() method is a final method, it does not override in child class.

  ordinal()方法是最终方法，它不会在子类中重写。

• This method does not throw an exception at the time of returning the position of the enum constants.

  返回枚举常量的位置时，此方法不会引发异常。

Syntax:

句法：

    public final int ordinal();

Parameter(s):

参数：

• It does not accept any parameter.

  它不接受任何参数。

Return value:

返回值：

The return type of this method is int, it returns the position of this enum constant.

该方法的返回类型为int ，它返回该枚举常量的位置。

Example:

例：

// Java program to demonstrate the example
// of int ordinal() of Enum class
enum Month {JAN,
FEB,
MAR,
APR,
MAY;
}
public class Ordinal {public static void main(String args[]) {Month m1 = Month.JAN;
Month m2 = Month.FEB;
Month m3 = Month.MAR;
Month m4 = Month.APR;
Month m5 = Month.MAY;
System.out.println("Display Ordinal: ");
// By using ordinal() method is to return the position of
//enum constant in its enum definition
System.out.println("m1.ordinal() " + " " + m1.ordinal());
System.out.println("m2.ordinal()" + " " + m2.ordinal());
System.out.println("m3.ordinal()" + " " + m3.ordinal());
System.out.println("m4.ordinal()" + " " + m4.ordinal());
System.out.println("m5.ordinal()" + " " + m5.ordinal());
}
}

Output

输出量

Display Ordinal:
m1.ordinal()  0
m2.ordinal() 1
m3.ordinal() 2
m4.ordinal() 3
m5.ordinal() 4

翻译自: https://www.includehelp.com/java/enum-ordinal-method-with-example.aspx

enum ordinal