1. Case-USAGE and spaces

Every letter has to be UPPERCASE.wrong space and case java
just write:

static final int DAYS_IN_WEEK = 7;

2. length

Write a value-name which shows it’s meaning in as less letters as possible.

long constant name java

just write:

static final int X = 1;

3. never start with a number

never use number begin constant java

just write:

static final int EVENT_ONE = 10;
static final int EVENT_TWO = 20;
static final int EVENT_THREE = 30;