Java Class getEnumConstants()用法及代碼示例

java.lang.Class類的getEnumConstants()方法用於獲取此類的Enum常量。該方法以對象數組的形式返回此類的Enum常量，該對象數組包含由此類表示的enum類。

用法:

public T[] getEnumConstants()

參數：此方法不接受任何參數

返回值：此方法以Enum對象數組的形式返回此類的指定Enum常量。

下麵的程序演示了getEnumConstants()方法。

範例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())); 
    } 
}

輸出：

Class represented by myClass:class A
Enum constants of myClass:[]

範例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); 
        } 
    } 
}

輸出：

Class represented by myClass:class A
Enum constants of myClass:[RED, GREEN, BLUE]

參考： https://docs.oracle.com/javase/9/docs/api/java/lang/Class.html#getEnumConstants-

相關用法

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