Java Class getEnumConstants()用法及代码示例

java.lang.Class类的getEnumConstants()方法用于获取此类的Enum常量。该方法以对象数组的形式返回此类的Enum常量，该对象数组包含由此类表示的enum类。

用法:

public T[] getEnumConstants()

参数：此方法不接受任何参数

返回值：此方法以Enum对象数组的形式返回此类的指定Enum常量。

下面的程序演示了getEnumConstants()方法。

范例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:[]

范例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#getEnumConstants-

相关用法

注：本文由纯净天空筛选整理自srinam大神的英文原创作品 Class getEnumConstants() method in Java with Examples。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。