enum Type {

    TYPE1(1),

    TYPE2(2),
    ...

    private int constant;

    Type(int constant) {
        this.constant = constant;
    }
}

enum SubType {

    SUBTYPE1(1),

    SUBTYPE2(2),

    SUBTYPE3(3),
    ...

    private int constant;

    SubType(int constant) {
        this.constant = constant;
    }
}