when to use enum in java code example

Example 1: enum java

private enum VarState {
	INIT, 
	TRUE, 
  	FALSE,
	UNSATISFIABLE 
}

Example 2: enum with methods in java example

public enum Level {
    HIGH{
        @Override
        public String asLowerCase() {
            return HIGH.toString().toLowerCase();
        }
    },
    MEDIUM{
        @Override
        public String asLowerCase() {
            return MEDIUM.toString().toLowerCase();
        }
    },
    LOW{
        @Override
        public String asLowerCase() {
            return LOW.toString().toLowerCase();
        }
    };

    public abstract String asLowerCase();
}