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ౣܽ যڌѱ ਊೡө?
ౣܽ যڌѱ ਊೡө? thdev.tech, 2017 1
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ࣗѐ
— ӂకജ
— RGPKorea ਃӝਃ উ٘۽٘ ѐߊ
— GDG Seoul Organizer
— ਬؘ : ౣܽ दೞӝ
— ࠶۽Ӓ : Է ݆ ѐߊо غ
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ౣܽۆ?
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ౣܽۆ?
— 2011֙ ࣗѐ
— ઇ࠳ۨੋীࢲ ઁ
— 2016֙ 1.0 ߓನ റ 1.1.50 ߡө
ߓನ
— উ٘۽٘ ҕध য(Java/Kotlin)
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ࢿ
— JDK 6/7/8/9 ਗਵ۽ Java৬ ֫ ഐജࢿ
— JDK 6/7ਸ ా೧ Android ҳ ߡਸ ழߡ
— উ٘۽٘ झౚ٣য়ܳ ాೠ ৮߷ೠ ో݂җ ࠽٘ दझమ ઁҕ
— ۽о٘ ਊ оמ
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ࢿמ
— Java৬ ਬࢎೠ ഋక bytecode ҳઑ۽ ੋ೧ ࡅܰѱ জ ز
— extension function/safety null/Lambda
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Learning Curve
— Java ѐߊۄݶ ־ҳա ਊ оמ
— ز ஶߡਸ ాೠ ౣܽ ൨ оמ
— Javaܳ ݽܰݶ ؊ۄب ࢎਊೞӝ औח ঋ
— ҡଳ Best Practices ࠗ
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Kotlin णೞӝ
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ޙࢲܳ ࠄ
— ޙࢲ݅ఀ જ Ѥ হযਃ
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଼ਸ ࠄ
— ޙࢲٜ
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ೠӖ ܐܳ ࠄ
— ߣࢲ, ழפש ଼, ҍ աৢ ౣܽ ࢲٜ
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ਬؘ ъܳ ࠄ
— $15 ಪ : ҍ সؘ(9ਘ ݈ or 10ਘ ୡ )
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kotlin ۽ં दೞӝ
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Try kotlinਵ۽ दೞӝ
— kotlin ࢎীࢲ ઁҕೞח try.kotlinlang.org
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࢜۽ ۽ં৬ ೣԋ द
— AS 3.0ীࢲ kotlin ۽ં۽ दೠ
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Java ۽ં ജೞӝ
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Java ۽ં ജೞӝ
— UIࠗఠ ೡө?
— data classࠗఠ ೡө?
— ࢜۽ ಕܳ ୶оೞݶࢲ ೯ೡө?
— ܻಂష݂ ೞݶࢲ ೡө?
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ח ۧѱ ೮যਃ
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ח ۧѱ ೮যਃ
— ࢠ ۽ં ઁ
— kotlin ҙ۲ ࠶۽Ӓ ࢿ
— ਬؘ ъ ઁ
— ഥࢎীࢲ पઁ ਊ
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ח ۧѱ ೮যਃ - ഥࢎীࢲ ਊೞӝ
— ࢜۽ ਊೞח Activity/Fragment ӝળਵ۽ ਊ
— ੌױ ߄۽ ࢿ೧ਃ
— command + option + shift + k۽ ജ
— ৮߷ ߸ജೞ ঋਵפ ੌࠗ ٘ܳ ࣚࠇפ
— android extensionب ೣԋ ਊפ.(UI ࢎਊ ಞࢿ)
— ޙࢲب ࠁҊ, ࢠب ٜ݅Ҋ
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ח ۧѱ ೮যਃ - ഥࢎীࢲ ਊೞӝ
— ಕয ۽Ӓې߁ਸ ా೧ ਊ೮যਃ
— MVVMਸ ೣԋ ਊ
— ఃࠁ٘ח 2ѐܳ ֬Ҋ
— ীࢲ ੑ٬җ ࢲ۽ ঌ۰ݶࢲ ೯
— ೠ ׳ р ೯
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ਊೞݶࢲ ೡ
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null ܻী ೞࣁਃ
// class name String.kt
fun merge(a: String, b: String) = "$a $b"
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null ܻী ೞࣁਃ - javaীࢲ ࠗܳ ٸ
// class name String.kt
fun merge(a: String, b: String) = "$a $b"
public class Sample {
@Test
public void sample() {
System.out.println("merge " + StringKt.merge("A", "B"));
}
}
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null ܻী ೞࣁਃ - javaীࢲ ࠗܳ ٸ
// class name String.kt
fun merge(a: String, b: String) = "$a $b"
public class Sample {
private String a = "A"; private String b = "B";
@Before
public void setUp() { a = null; }
@Test
public void sample() {
System.out.println("merge " + StringKt.merge(a, b));
}
}
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null ܻী ೞࣁਃ - javaীࢲ ࠗܳ ٸ
// class name String.kt
fun merge(a: String, b: String) = "$a $b"
public class Sample {
private String a = "A"; private String b = "B";
@Before
public void setUp() { a = null; }
@Test
public void sample() {
System.out.println("merge " + StringKt.merge(a, b));
// java.lang.IllegalArgumentException:
// Parameter specified as non-null is null:
// method tech.thdev.myapplication.StringKt.merge
}
}
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উೞѱ ܻೞӝ ਤ೧ࢲ
— nullable ܻ
— ? ೞաݶ ܻ оמ
// class name String.kt
fun merge(a: String?, b: String?) = "$a $b"
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elvis operator
String merge(String a, String b) {
return (a != null ? a : "a") + " " + (b != null ? b : "b");
}
a != null ? a : "a"
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elvis operator
-> java
String merge(String a, String b) {
return (a != null ? a : "a") + " " + (b != null ? b : "b");
}
a != null ? a : "a"
-> kotlin
fun merge(a: String?, b: String?)
= "${a ?: "a"} ${b ?: "b"}"
a ?: "a"
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ਬਊೠ ޙߨٜ
— let : null ী ۽ ࢎਊೞחؘ value(data)ীࢲ݅ ೞח ѱ જ
ইਃ
— apply : ࢤࢿҗ زदী ਊೡ ٸ ਬਊ೧ਃ
— run : ࢤࢿೠ View ژח ёী Ӕೡ ٸ ਬਊ೧ਃ
— with() : Viewী ࢎਊೡ ٸ?
— also : ё copy
— takeIf : if ݶ return or null
— takeUnless : ifо ইפݶ return or null
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ೣࣻ ഛ
fun View.onBindView() {
tv_title.text = "TITLE"
// ...
}
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Higher-Order Functions
class Sample {
fun test() {
higherOrder {
(a, b) -> a + b
}
}
fun higherOrder(sum: (Int, Int) -> Int) = sum(10, 20)
}
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data class
public final class UserInfo {
private String name;
private int age;
public UserInfo(String name, int age) {
this.name = name;
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String toString() {
return "UserInfo(name=" + this.name + ", age=" + this.age + ")";
}
public int hashCode() {
return (this.name != null?this.name.hashCode():0) * 31 + this.age;
}
public boolean equals(Object var1) {
if (obj == this) return true;
if (!(obj instanceof UserInfo)) {
return false;
}
UserInfo userInfo = (UserInfo) obj;
return userInfo.name.equals(name) &&
userInfo.age == age;
}
}
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data class
— ցޖ ӡয
— ࠁউਸ ਤೠ hashCode, equalsח যঠ ೣ
— get/setب ਃೣ
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data class
— ցޖ ӡয
— ࠁউਸ ਤೠ hashCode, equalsח যঠ ೣ
— get/setب ਃೣ
-> kotlin data class ਊਵ۽ ೠߑী ೧Ѿ
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data class
data class UserInfo(var name: String?, var age: Int?)
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Ӓېࢲ?
— ౣܽ જইਃ.
— ח ب۽ ࢎਊ೮যਃ
wakatime
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Ӓېࢲ?
— ഥࢎীࢲ ਊೞݶࢲ ҕࠗೞח ѱ о જҊ
— kotlin ਊ റ javaо ҾӘೞݶ ٣ஹੌ ೞӝ
— ੌױ javaۢ ࢿೞݶࢲ ҕࠗೞࣁਃ.
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