Java 中的 Class getEnumConstants()方法，带示例
原文:https://www . geesforgeks . org/class-getenumconstats-method-in-Java-with-examples/
java.lang.Class 类 的getenumconstats()方法用于获取该类的枚举常量。方法以对象数组的形式返回此类的枚举常量，这些对象构成了此类表示的枚举类。
语法:
public T[] getEnumConstants()
参数:该方法不接受任何参数
返回值:这个方法以枚举对象数组的形式返回这个类的指定枚举常量。
下面的程序演示了 getEnumConstants()方法。
例 1:
// Java program to demonstrate
// getEnumConstants() method
import java.util.*;
enum A {}
public class Test {
public Object obj;
public static void main(String[] args)
{
// returns the Class object for this class
Class myClass = A.class;
System.out.println("Class represented by myClass: "
+ myClass.toString());
// Get the Enum constants of myClass
// using getEnumConstants() method
System.out.println(
"Enum constants of myClass: "
+ Arrays.toString(
myClass.getEnumConstants()));
}
}
输出:
Class represented by myClass: class A
Enum constants of myClass: []
例 2:
// Java program to demonstrate
// getEnumConstants() method
import java.util.*;
enum A {
RED,
GREEN,
BLUE;
}
class Main {
private Object obj;
public static void main(String[] args)
{
try {
// returns the Class object for this class
Class myClass = A.class;
System.out.println("Class represented by myClass: "
+ myClass.toString());
// Get the Enum constants of myClass
// using getEnumConstants() method
System.out.println(
"Enum constants of myClass: "
+ Arrays.toString(
myClass.getEnumConstants()));
}
catch (Exception e) {
System.out.println(e);
}
}
}
输出:
Class represented by myClass: class A
Enum constants of myClass: [RED, GREEN, BLUE]
参考:https://docs . Oracle . com/javase/9/docs/API/Java/lang/class . html # getenumconstats–
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