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Kotlin Nested and Inner Classes Code SampleCode 

Issue: BAEL-1759
This commit is contained in:
Juan Moreno 2018-08-13 20:33:36 -03:00 committed by Josh Cummings
parent 5eea4fc6a6
commit 74e3e7ff95
3 changed files with 127 additions and 24 deletions
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48
core-kotlin/pom.xml
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@ -106,22 +106,22 @@
<artifactId>klaxon</artifactId>
<version>${klaxon.version}</version>
</dependency>
<dependency>
<groupId>io.ktor</groupId>
<artifactId>ktor-server-netty</artifactId>
<version>${ktor.io.version}</version>
</dependency>
<dependency>
<groupId>io.ktor</groupId>
<artifactId>ktor-gson</artifactId>
<version>${ktor.io.version}</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>1.2.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>io.ktor</groupId>
<artifactId>ktor-server-netty</artifactId>
<version>${ktor.io.version}</version>
</dependency>
<dependency>
<groupId>io.ktor</groupId>
<artifactId>ktor-gson</artifactId>
<version>${ktor.io.version}</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>1.2.1</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
@ -166,13 +166,13 @@
<target>${java.version}</target>
</configuration>
<executions>
<!-- Replacing default-compile as it is treated specially
<!-- Replacing default-compile as it is treated specially
by maven -->
<execution>
<id>default-compile</id>
<phase>none</phase>
</execution>
<!-- Replacing default-testCompile as it is treated specially
<!-- Replacing default-testCompile as it is treated specially
by maven -->
<execution>
<id>default-testCompile</id>
@ -224,10 +224,10 @@
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<kotlin-maven-plugin.version>1.2.51</kotlin-maven-plugin.version>
<kotlin-test-junit.version>1.2.51</kotlin-test-junit.version>
<kotlin-stdlib.version>1.2.51</kotlin-stdlib.version>
<kotlin-reflect.version>1.2.51</kotlin-reflect.version>
<kotlin-maven-plugin.version>1.2.60</kotlin-maven-plugin.version>
<kotlin-test-junit.version>1.2.60</kotlin-test-junit.version>
<kotlin-stdlib.version>1.2.60</kotlin-stdlib.version>
<kotlin-reflect.version>1.2.60</kotlin-reflect.version>
<kotlinx.version>0.22.5</kotlinx.version>
<ktor.io.version>0.9.2</ktor.io.version>
<mockito-kotlin.version>1.5.0</mockito-kotlin.version>
@ -235,9 +235,9 @@
<klaxon.version>3.0.4</klaxon.version>
<khttp.version>0.1.0</khttp.version>
<commons-math3.version>3.6.1</commons-math3.version>
<junit.platform.version>1.0.0</junit.platform.version>
<junit.platform.version>1.1.1</junit.platform.version>
<junit.vintage.version>5.2.0</junit.vintage.version>
<assertj.version>3.10.0</assertj.version>
</properties>
</project>
</project>

75
core-kotlin/src/main/kotlin/com/baeldung/nested/Computer.kt Normal file
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@ -0,0 +1,75 @@
package com.baeldung.nested
import org.slf4j.Logger
import org.slf4j.LoggerFactory
class Computer(val model: String) {
companion object {
const val originCountry = "China"
fun getBuiltDate(): String {
return "2018-05-23"
}
val log: Logger = LoggerFactory.getLogger(Computer::class.java)
}
//Nested class
class MotherBoard(val manufacturer: String) {
fun getInfo() = "Made by $manufacturer installed in $originCountry - ${getBuiltDate()}"
}
//Inner class
inner class HardDisk(val sizeInGb: Int) {
fun getInfo() = "Installed on ${this@Computer} with $sizeInGb GB"
}
interface Switcher {
fun on(): String
}
interface Protector {
fun smart()
}
fun powerOn(): String {
//Local class
var defaultColor = "Blue"
class Led(val color: String) {
fun blink(): String {
return "blinking $color"
}
fun changeDefaultPowerOnColor() {
defaultColor = "Violet"
}
}
val powerLed = Led("Green")
log.debug("defaultColor is $defaultColor")
powerLed.changeDefaultPowerOnColor()
log.debug("defaultColor changed inside Led class to $defaultColor")
//Anonymous object
val powerSwitch = object : Switcher, Protector {
override fun on(): String {
return powerLed.blink()
}
override fun smart() {
log.debug("Smart protection is implemented")
}
fun changeDefaultPowerOnColor() {
defaultColor = "Yellow"
}
}
powerSwitch.changeDefaultPowerOnColor()
log.debug("defaultColor changed inside powerSwitch anonymous object to $defaultColor")
return powerSwitch.on()
}
override fun toString(): String {
return "Computer(model=$model)"
}
}

28
core-kotlin/src/test/kotlin/com/baeldung/nested/ComputerUnitTest.kt Normal file
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@ -0,0 +1,28 @@
package com.baeldung.nested
import org.assertj.core.api.Assertions.assertThat
import org.junit.jupiter.api.Test
class ComputerUnitTest {
@Test
fun givenComputer_whenPowerOn_thenBlink() {
val computer = Computer("Desktop")
assertThat(computer.powerOn()).isEqualTo("blinking Green")
}
@Test
fun givenMotherboard_whenGetInfo_thenGetInstalledAndBuiltDetails() {
val motherBoard = Computer.MotherBoard("MotherBoard Inc.")
assertThat(motherBoard.getInfo()).isEqualTo("Made by MotherBoard Inc. installed in China - 2018-05-23")
}
@Test
fun givenHardDisk_whenGetInfo_thenGetComputerModelAndDiskSizeInGb() {
val hardDisk = Computer("Desktop").HardDisk(1000)
assertThat(hardDisk.getInfo()).isEqualTo("Installed on Computer(model=Desktop) with 1000 GB")
}
}