public interface ReturnValues
{
  public int EXIT_SUCCESS  =  0;
  public int EXIT_FAILURE  =  1;
}

public enum ReturnValue {
    SUCCESS(0),
    FAILURE(-1);

    private int returnCode;

    private ReturnValue(int returnCode) {
        this.returnCode = returnCode;
    }

    public int getReturnCode() {
        return returnCode;
    }
}

System.exit(ReturnCode.FAILURE.getReturnCode());