Question

Possible Duplicate:
Enum values().length vs private field

I want to know how which of these ways to find the size of the enum is better.

This way:

public enum Company {

    AUDI(4), BMW(5), CADILLAC(11), FORD(44), JAGUAR(45);

    private final int id;
    public final int length = Company.values().length;

    private Company(int id) {
        this.id = id;
    }
}

Or this way:

public enum Company {

    AUDI(4), BMW(5), CADILLAC(11), FORD(44), JAGUAR(45);

    private final int id;
    public final int length = 5;

    private Company(int id) {
        this.id = id;
    }
}

Answer 1

The first one, but make it static so you don’t make multiple copies of the array.

public final static int length = Company.values().length;