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Java vs OOP
Yegor Bugayenko

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long video showing
Clojure 8000+ lines Java
class

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Java
books
frameworks
Google
OOP

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if it works,
it’s good if it’s good,
it works

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“Just make $1B with
something instead of
ORM and you will be
right”
— Victor

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enemy #1:
books

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“Objects may contain
data, in the form of
fields, often known as
attributes; and code, in
the form of procedures,
often known as methods”

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“Each object looks quite
a bit like a little
computer — it has a
state, and it has
operations that you can
ask it to perform”
- page 16

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“A class is a collection
of data fields that hold
values and methods that
operate on those values”
- page 98

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“An object is some
memory that holds a
value of some type”
- page 40

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“An object consists of
some private memory and
a set of operations.”
- page 6

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“An object is the
equivalent of the quanta
from which the universe
is constructed”
- page 66

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enemy #2:
languages

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static
public
null
final
return
instanceof
.class
@

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final
- immutability
- setters
- anemic model
- data structures
- procedural thinking

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static
- utility classes
- singletons
- procedural thinking

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instanceof
- reflection API
- no polymorphism
- no encapsulation
- procedural thinking
.class

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@
- split objects apart
- anemic model
- procedural thinking

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enemy #3:
frameworks

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JAX-RS
JPA
Play
Spring
JavaBeans
Apache Commons
Guava
JDK
JAXB

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JAX-RS
@Path(“/”)
public class Index {
@GET
@Produces(“text/plain”)
public String get() {
return “hello, world!”;
}
}

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Apache Commons
text = FileUtils.readFileToSTring(f);
StringUtils.abbreviate(“hello, world!”);
DigestUtils.md5(“some text”);

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JPA
@Entity(table = “book”)
public class Book {
@Id
public int id;
@Column
public String title;
}

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enemy #4:
Google

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Android SDK
android.app.Activity
200+ methods
it’s a shame

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time to change sides!

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$20
for
JavaDay
shop@yegor256.com