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妤抉折快技批扭抉把忘
我扼扭抉抖抆戒抉志忘找抆 Scala

妤抉折快技批我技快扶扶抉 Scala?

妤抉折快技批我技快扶扶抉 Scala?
妥抑戒忘忌抑抖扭把抉改找抉找扼抖忘抄忱, 我技扭把抉志我戒我把批抄!

妤把抉扼找抉抄 POJO
public class User {
private String name;
private String email;
private DateTime registerDate;
}

public User() {
}
public User(String name, String email,
DateTime registerDate) {
this.name = name;
this.email = email;
this.registerDate = registerDate;
}

public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public DateTime getRegisterDate() {
return registerDate;
}
public void setRegisterDate(DateTime registerDate) {
}

@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
User user = (User) o;
if (name != null ? !name.equals(user.name) : user.name != null) return false;
if (email != null ? !email.equals(user.email) : user.email != null) return false;
return registerDate != null ? registerDate.equals(user.registerDate) : user.registerDate == null;
}
@Override
public int hashCode() {
int result = name != null ? name.hashCode() : 0;
result = 31 * result + (email != null ? email.hashCode() : 0);
result = 31 * result + (registerDate != null ? registerDate.hashCode() : 0);
return result;
}

public class User {
private String name;
private String email;
private DateTime registerDate;
public User() {
}
public User(String name, String email,
DateTime registerDate) {
this.name = name;
this.email = email;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public DateTime getRegisterDate() {
return registerDate;
}
public void setRegisterDate(DateTime registerDate) {
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
User user = (User) o;
if (name != null ? !name.equals(user.name) : user.name != null) return false;
if (email != null ? !email.equals(user.email) : user.email != null) return false;
return registerDate != null ? registerDate.equals(user.registerDate) : user.registerDate == null;
}
@Override
public int hashCode() {
int result = name != null ? name.hashCode() : 0;
result = 31 * result + (email != null ? email.hashCode() : 0);
result = 31 * result + (registerDate != null ? registerDate.hashCode() : 0);
return result;
}
}

妤把抉扼找抉抄 case class
case class User(name: String, email: String,
registerDate: DateTime = DateTime.now)
val obj1 = User(?Some name?, ?Some email?)
val obj2 = obj1.copy()
val obj3 = obj1.copy(name = ?New name?)

妊抉扭抉扼找忘志抖快扶我快扼抉忌把忘戒扯抉技
public abstract class Homo
pubic class HomoHabilis extends Homo {
}
public class HomoHeidelbergensis extends Homo {
}
public class HomoSapiens extends Homo {
}
public void evolve(Homo homo) {
if (homo instanceof HomoHabilis) {
HomoHabilis h = (HomoHabilis) homo
//die
return;
}
if (homo instanceof HomoHeidelbergensis) {
//cast
//die
return;
}
if (homo instanceof HomoSapiens) {
//cast
//evolve
return;
}
}

妊抉扭抉扼找忘志抖快扶我快扼抉忌把忘戒扯抉技
abstract class Homo
class HomoHabilis extends Homo
class HomoHeidelbergensis extends Homo
class HomoSapiens extends Homo
def evolve(homo: Homo) {
homo match {
case habilis: HomoHabilis => //die
case heidelbergensis: HomoHeidelbergensis => //die
case sapiens: HomoSapiens => //love scala ^__^
}
}

妖忘志抗批扼扶抉快
? 抖攻忌抉快志抑把忘忪快扶我快志抉戒志把忘投忘快找把快戒批抖抆找忘找
? 忍快扶快把忘找抉把抑扯我抗抖抉志 + 把快戒批抖抆找忘找志志我忱快扼扭我扼抗忘
? 扭忘把扼快把-抗抉技忌我扶忘找抉把抑
? xml 扶忘批把抉志扶快扼我扶找忘抗扼我扼忘攸戒抑抗忘
? null-safe (戒忘我扼扭抉抖抆戒抉志忘扶我快 null 忌抆攻找扶抉忍抉抄志抖我扯抉)
? 抖快忍抗抉扼找把抉我找抆 DSL
? () 我 ; 扶快扶批忪扶抑!
? 扳批扶抗扯我攻技抉忪扶抉志抑戒志忘找抆忌快戒找抉折抗我
? == 把忘忌抉找忘快找抗忘抗 equals
? 抉忱我扶扳忘抄抖 != 抉忱扶抉技抗抖忘扼扼

妖快技扶抉忍抉技忘忍我我
val xml = <root>
<first>
<action>
<name>Say</name>
<value>Hello</value>
</action>
<action>
<name>Don't say</name>
<value>Goodbye</value>
</action>
</first>
<first>
<action>
<name>Love</name>
<value>Scala</value>
</action>
<action>
<name>Use</name>
<value>FP</value>
</action>
</first>
</root>
object XmlParserApp {
case class MyAction(name: String, value: String)
def main(args: Array[String]): Unit = {
val result = for {firstEl <- xml "first"
actionEl <- firstEl "action"} yield {
MyAction(
name = (actionEl "name").text,
value = (actionEl "value").text
)
}
result.foreach(println(_))
}
}

妙我扶批扼抑
? 折忘扼找抆忌我忌抖我抉找快抗戒忘忌忘忍抉志忘扶抑
? 扶快找扼抉志技快扼找我技抉扼找我忌忘抄找抗抉忱忘技快忪忱批志快把扼我攸技我攸戒抑抗忘
? 折忘扼找抆我扼抒抉忱扶我抗抉志扶快志抉戒技抉忪扶抉折我找忘找抆. 妊抉志扼快技.
? 扶快攸志扶抑快扭把快抉忌把忘戒抉志忘扶我攸(implicit)
? 抗忘抗-忌改扼抉志技快扼找我技抉扼找抆扼 Java
? 扼志抉攸把快扳抖快抗扼我攸
? 技快忱抖快扶扶抑抄抗抉技扭我抖攸找抉把
? 批 sbt 扼志抉我找忘把忘抗忘扶抑
? Scala 扭抖忘忍我扶忱抖攸 Idea 找批扭我找我找抉把技抉戒我找
? ?忱把批忪快抖攻忌扶抉快" 抗抉技抆攻扶我找我

妊扭忘扼我忌抉
坎抉把我扼妥忘扮抗批抖抉志
boris.tashkulov@dz.ru
@crashkin

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[Expert Fridays] Java MeetUp - 坎抉把我扼 妥忘扮抗批抖抉志 (Teamlead Enterprise): "妤抉折快技批 扭抉把忘 我扼扭抉抖抆戒抉志忘找抆 Scala"

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[Expert Fridays] Java MeetUp - 坎抉把我扼 妥忘扮抗批抖抉志 (Teamlead Enterprise): "妤抉折快技批 扭抉把忘 我扼扭抉抖抆戒抉志忘找抆 Scala"

[Expert Fridays] Java MeetUp - 坎抉把我扼妥忘扮抗批抖抉志 (Teamlead Enterprise): "妤抉折快技批扭抉把忘我扼扭抉抖抆戒抉志忘找抆 Scala"

[Expert Fridays] Java MeetUp - 坎抉把我扼妥忘扮抗批抖抉志 (Teamlead Enterprise): "妤抉折快技批扭抉把忘我扼扭抉抖抆戒抉志忘找抆 Scala"