Convert from enum ordinal/constant to enum type

[will zhang]

I want to get enum type based on the code(an int)
Here's what I have using switch:

   
	public enum Type
	{
		AA(1050), BB(1051), CC(1052), DD(1053), EE(1054);
		
		private int code;
		Type(int c) 
		{
			this.code = c;
		}
		
		public int getCode()
		{
			return code;
		}
		
		public static Type getType(int c)
		{
			switch (c) 
			{
		    case 1050: return AA;
		    case 1051: return BB;
		    case 1052: return CC;
		    case 1053: return DD;
		    case 1054: return EE;
			}
			return null;
		}
	}
 

Is there any way I can use instead of switch?

I saw something here: http://stackoverflow.com/questions/609860/convert-from-enum-ordinal-to-enum-type
But I couldn't understand the second method, any hint?

Thanks

[John de Michele]

Will:

You could create a static Map with your codes as keys and your enums as values.

John.

[Rob Spoor]

Or loop over the array returned by values():

public enum Type   
{   
    AA(1050), BB(1051), CC(1052), DD(1053), EE(1054);   

    private int code;   
    Type(int c)    
    {   
        this.code = c;   
    }   
           
    public int getCode()   
    {   
        return code;   
    }   
           
    public static Type getType(int c)   
    {   
        for (Type type: values())
        {
            if (type.code == c)
            {
                return type;
            }
        }
        return null;   
    }   
}  

It's a bit of a choice which one to use, the loop or the Map. The Map is faster (O(1)) but requires extra memory to store it. The loop doesn't need the memory but needs to loop each time (O(n)).