Java Basic Online Test – 3

1. If we try to add Enum constants to a TreeSet, what sorting order will it use?

2. Which class does all the Enums extend?

3. What will be the output of the following Java code snippet?

enum Enums
{
    A, B, C;
     
    private Enums()
    {
        System.out.println(10);
    }
}
 
public class MainClass
{
    public static void main(String[] args)
    {
        Enum en = Enums.B;
    }
}

4. What is the order of variables in Enum?

5. What will be the output of the following Java code snippet?

 enum Levels 
{
    private TOP,
     
    public MEDIUM,
     
    protected BOTTOM;
}

6. Can we create an instance of Enum outside of Enum itself?

7. What will be the output of the following Java code snippet?

class A
{
     
}
 
enum Enums extends A
{
    ABC, BCD, CDE, DEF;
}

8. Are enums are type-safe?

9. What will be the output of the following Java code?

 
    enum Season 
    {
        WINTER, SPRING, SUMMER, FALL
    };
    System.out.println(Season.WINTER.ordinal());

10. Which method returns the elements of Enum class?