core-scala: initial commit
This commit is contained in:
parent
e35e84291e
commit
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apply plugin: 'scala'
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repositories {
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mavenCentral()
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}
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dependencies {
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compile 'org.scala-lang:scala-library:2.12.6'
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testCompile 'org.scalatest:scalatest_2.12:3.0.5'
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testCompile 'junit:junit:4.12'
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}
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import Dependencies._
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lazy val root = (project in file(".")).
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settings(
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inThisBuild(List(
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organization := "com.example",
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scalaVersion := "2.12.6",
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version := "0.1.0-SNAPSHOT"
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)),
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name := "core-scala",
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libraryDependencies += scalaTest % Test
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)
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<artifactId>core-scala</artifactId>
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<version>1.0-SNAPSHOT</version>
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<packaging>jar</packaging>
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<parent>
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<groupId>com.baeldung</groupId>
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<artifactId>parent-modules</artifactId>
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<version>1.0.0-SNAPSHOT</version>
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</parent>
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<properties>
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<maven.compiler.source>1.8</maven.compiler.source>
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<maven.compiler.target>1.8</maven.compiler.target>
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<encoding>UTF-8</encoding>
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<scala.version>2.12.6</scala.version>
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<scala.compat.version>2.12</scala.compat.version>
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<spec2.version>4.2.0</spec2.version>
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</properties>
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<dependencies>
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<dependency>
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<groupId>org.scala-lang</groupId>
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<artifactId>scala-library</artifactId>
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<version>${scala.version}</version>
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</dependency>
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<!-- Test -->
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<version>4.12</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.scalatest</groupId>
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<artifactId>scalatest_${scala.compat.version}</artifactId>
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<version>3.0.5</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.specs2</groupId>
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<artifactId>specs2-core_${scala.compat.version}</artifactId>
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<version>${spec2.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.specs2</groupId>
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<artifactId>specs2-junit_${scala.compat.version}</artifactId>
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<version>${spec2.version}</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<sourceDirectory>src/main/scala</sourceDirectory>
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<testSourceDirectory>src/test/scala</testSourceDirectory>
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<plugins>
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<plugin>
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<!-- see http://davidb.github.com/scala-maven-plugin -->
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<groupId>net.alchim31.maven</groupId>
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<artifactId>scala-maven-plugin</artifactId>
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<version>3.3.2</version>
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<executions>
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<execution>
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<goals>
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<goal>compile</goal>
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<goal>testCompile</goal>
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</goals>
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<configuration>
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<args>
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<arg>-dependencyfile</arg>
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<arg>${project.build.directory}/.scala_dependencies</arg>
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</args>
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</configuration>
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</execution>
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</executions>
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</plugin>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-surefire-plugin</artifactId>
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<version>2.21.0</version>
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<configuration>
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<!-- Tests will be run with scalatest-maven-plugin instead -->
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<skipTests>true</skipTests>
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</configuration>
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</plugin>
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<plugin>
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<groupId>org.scalatest</groupId>
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<artifactId>scalatest-maven-plugin</artifactId>
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<version>2.0.0</version>
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<configuration>
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<reportsDirectory>${project.build.directory}/surefire-reports</reportsDirectory>
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<junitxml>.</junitxml>
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<filereports>TestSuiteReport.txt</filereports>
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<!-- Comma separated list of JUnit test class names to execute -->
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<jUnitClasses>samples.AppTest</jUnitClasses>
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</configuration>
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<executions>
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<execution>
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<id>test</id>
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<goals>
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<goal>test</goal>
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</goals>
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</execution>
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</executions>
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</plugin>
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</plugins>
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</build>
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</project>
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import sbt._
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object Dependencies {
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lazy val scalaTest = "org.scalatest" %% "scalatest" % "3.0.5"
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}
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sbt.version=1.1.6
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package com.baeldung.examples
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object ClassExamples extends App {
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import java.time._
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class Customer(val id:Int, val name:String, dob:LocalDate) {
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private var _age = calculateAge(dob)
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def age = _age // getter
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def age_= (age:Int) = _age = age //setter
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private def calculateAge(dob:LocalDate) = Period
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.between(dob, LocalDate.now)
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.getYears
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//override def toString: String = s"(id:${id}, name:${name}, age:${age})"
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}
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val c = new Customer(1, "Varun Sharma", LocalDate.parse("1980-02-27"))
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println(c)
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case class Address(addressLn1:String, area:String, city:String, zip:String)
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val address=Address("102, Raycon Lotus Apartment", "AECS Layout", "Bangalore", "560037")
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val anotherAddress = address.copy(addressLn1="41/2, ITPL Road")
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println(address)
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println(anotherAddress)
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}
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package com.baeldung.examples
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object CollectionExamples extends App {
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val aList = List(5, 3, 9, 2) // create a list
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val sortedAscList = aList.sorted // sort ascending
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val sortedDescList = aList.sortWith(_ > _) // sort descending
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val evenList = aList.filter(_%2 == 0) // filter on some condition
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val mySet = Set(10, 20, 5) // create a set
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val changedSet = mySet + 50 // add an element
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println(changedSet)
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val changedSet2 = mySet - 20 // remove an element
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println(changedSet2)
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val capitals = Map("Japan" -> "Tokyo",
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"England" -> "London",
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"India" -> "New Delhi") // create a map
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val capitalOfJapan = capitals("Japan") // get from map
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println(capitalOfJapan)
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}
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package com.baeldung.examples
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object ExceptionHandlingExamples extends App {
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import java.io._
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def printLines(filename:String) = {
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var reader:Option[BufferedReader] = None
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try {
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reader = Some(new BufferedReader(new FileReader(new File(filename))))
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reader.get.lines().forEach(println(_))
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} catch {
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case e:FileNotFoundException => println(s"There was no file named ${filename}")
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case e:Throwable => throw new Exception("Some error occurred", e)
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} finally {
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if (reader.isDefined) reader.get.close()
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}
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}
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printLines("test.txt")
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}
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package com.baeldung.examples
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object FirstClassFunctionExamples extends App {
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def sum(x:Double, y:Double, f:Double => Double) = f(x) + f(y)
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println(sum(3, 4, x => x*x)) // returns 25.0
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println(sum(3, 4, x => x*x*x)) // returns 91.0
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println(sum(3, 4, Math.pow(_, 2))) // returns 25.0
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def max(first:Int, second:Int) = if (first > second) first else second
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println(max(10, -2))
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}
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package com.baeldung.examples
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object LoopAndCalculationExamples extends App {
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import CalculationUtils._
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println(sumWithWhile(Array(10, 20, 30)))
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println(sumWithFor(Array(10, 20, 30)))
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println(checkEvenOdd((1 to 10).toArray).toList)
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println(filterEvens((1 to 10).toArray).toList)
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}
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object CalculationUtils {
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def sumWithWhile(values:Array[Int]) = {
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var sum = 0
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var i = 0
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while ( i < values.length) {
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sum += values(i)
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i+=1
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}
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sum
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}
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def sumWithFor(values:Array[Int]) = {
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var sum = 0
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for (i <- values) {
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sum += i
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}
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sum
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}
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def checkEvenOdd(values:Array[Int]) = {
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for (i <- values) yield if (i%2 == 0) "Even" else "Odd"
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}
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def filterEvens(values:Array[Int]) =
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for (i <- values if i%2 == 0)
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yield i
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}
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package com.baeldung.examples
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/**
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* @author ${user.name}
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*/
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object MyApp {
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def foo(x : Array[String]) = x.foldLeft("")((a,b) => a + b)
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def main(args : Array[String]) {
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println( "Hello World!" )
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println("Number of arguments passed:" + args.length)
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}
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}
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package com.baeldung.examples
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object ObjectExamples extends App {
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import java.time._
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class Customer(val id:Int, val name:String, private var _age:Int) {
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def age = this._age
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def age_= (age:Int) = _age = age
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}
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object Customer {
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def apply(id:Int, name:String, age:Int) = new Customer(id, name, age)
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def apply(id:Int, name:String, dob:LocalDate) = {
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val p = Period.between(dob, LocalDate.now)
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new Customer(id, name, p.getYears)
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}
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}
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val c = Customer(1, "Varun Sharma", LocalDate.parse("1980-02-27"))
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c.age = 20
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println(c.age)
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}
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@ -0,0 +1,12 @@
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package com.baeldung.examples
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object OptionExample extends App {
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def minimumEvenNumber(data:Array[Int]) = {
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val evens = data.filter(_%2 == 0)
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if (evens.isEmpty) None else Some(evens.min)
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}
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val minEven = minimumEvenNumber(Array(21, 3, 11, 7)).getOrElse(0)
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println(minEven)
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}
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package com.baeldung.examples
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object PatternMatchingExample extends App {
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abstract class Item
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case class Book(title:String, author:String, price:Double) extends Item
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case class MusicCD(title:String, genre:String, price:Double) extends Item
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def describe(item:Item) = item match {
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case b:Book if b.price > 1000 => println(s"The book ${b.title} is expensive")
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case b:Book => println(s"The book ${b.title} is written by ${b.author}.")
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case MusicCD(title, "Jazz", _) => println(s"This is a CD of Jazz music.")
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case _ => println("Unknown Item")
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}
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describe(Book("Half Girlfriend", "Chetan Bhagat", 100))
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}
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package com.baeldung.examples
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import java.io._
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object TraitExample extends App {
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trait Loggable {
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val logger:PrintStream
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def getPrefix():String
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def log(message:String) = logger.println(s"[${getPrefix()}]:${message}")
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}
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object CustomerService extends Loggable {
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override val logger = System.out
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override def getPrefix(): String = "CustomerService"
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def retrieve(id:String) = {
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log(s"Retrieve with id ${id} called")
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// Code to retrieve Customer from DB
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}
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}
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CustomerService.retrieve("C100")
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}
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package com.baeldung.examples
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object TupleExamples extends App {
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val empSal:(String, Int) = ("David", 10000)
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def getMaxMinSalary(empSal:Array[(String, Int)]) = {
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val minEmpSal = empSal.minBy(empSal => empSal._2)
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val maxEmpSal = empSal.maxBy(empSal => empSal._2)
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(maxEmpSal._2, minEmpSal._2)
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}
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val empSalArr = Array(("David", 12000), ("Maria", 15000),
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("Elisa", 11000), ("Adam", 8000))
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val (maxSalary, minSalary) = getMaxMinSalary(empSalArr)
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println("Max Salary: " + maxSalary + " and Min Salary: " + minSalary)
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}
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@ -0,0 +1,24 @@
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package com.baeldung.examples
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|
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object VariableDeclaration extends App {
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val x:Int = 0
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var friend:String = "David"
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lazy val greet = "Hello" + friend
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val data = Array(2, 4, 5)
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|
|
||||||
|
printHelloWorld()
|
||||||
|
println(sum(10, 20))
|
||||||
|
|
||||||
|
def printHelloWorld():Unit = {
|
||||||
|
println("Hello World")
|
||||||
|
}
|
||||||
|
|
||||||
|
def sum(x:Int, y:Int) = x + y
|
||||||
|
|
||||||
|
def sayGreeting(to:String, greet:String="Hi", message:String = "How are you?") = println(greet + " " + to + ", " + message)
|
||||||
|
|
||||||
|
sayGreeting(to="David", message="How are you doing?")
|
||||||
|
sayGreeting(greet="Hello", to="Maria")
|
||||||
|
|
||||||
|
}
|
|
@ -0,0 +1,17 @@
|
||||||
|
package samples
|
||||||
|
|
||||||
|
import org.junit._
|
||||||
|
import Assert._
|
||||||
|
|
||||||
|
@Test
|
||||||
|
class AppTest {
|
||||||
|
|
||||||
|
@Test
|
||||||
|
def testOK() = assertTrue(true)
|
||||||
|
|
||||||
|
// @Test
|
||||||
|
// def testKO() = assertTrue(false)
|
||||||
|
|
||||||
|
}
|
||||||
|
|
||||||
|
|
|
@ -0,0 +1,108 @@
|
||||||
|
/*
|
||||||
|
* Copyright 2001-2009 Artima, Inc.
|
||||||
|
*
|
||||||
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
||||||
|
* you may not use this file except in compliance with the License.
|
||||||
|
* You may obtain a copy of the License at
|
||||||
|
*
|
||||||
|
* http://www.apache.org/licenses/LICENSE-2.0
|
||||||
|
*
|
||||||
|
* Unless required by applicable law or agreed to in writing, software
|
||||||
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
||||||
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||||
|
* See the License for the specific language governing permissions and
|
||||||
|
* limitations under the License.
|
||||||
|
*/
|
||||||
|
package samples
|
||||||
|
|
||||||
|
/*
|
||||||
|
ScalaTest facilitates different styles of testing by providing traits you can mix
|
||||||
|
together to get the behavior and syntax you prefer. A few examples are
|
||||||
|
included here. For more information, visit:
|
||||||
|
|
||||||
|
http://www.scalatest.org/
|
||||||
|
|
||||||
|
One way to use ScalaTest is to help make JUnit or TestNG tests more
|
||||||
|
clear and concise. Here's an example:
|
||||||
|
*/
|
||||||
|
import scala.collection._
|
||||||
|
import org.scalatest.Assertions
|
||||||
|
import org.junit.Test
|
||||||
|
|
||||||
|
class StackSuite extends Assertions {
|
||||||
|
|
||||||
|
@Test def stackShouldPopValuesIinLastInFirstOutOrder() {
|
||||||
|
val stack = new mutable.ArrayStack[Int]
|
||||||
|
stack.push(1)
|
||||||
|
stack.push(2)
|
||||||
|
assert(stack.pop() === 2)
|
||||||
|
assert(stack.pop() === 1)
|
||||||
|
}
|
||||||
|
|
||||||
|
@Test def stackShouldThrowRuntimeExceptionIfAnEmptyArrayStackIsPopped() {
|
||||||
|
val emptyStack = new mutable.ArrayStack[String]
|
||||||
|
intercept[RuntimeException] {
|
||||||
|
emptyStack.pop()
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
Here's an example of a FunSuite with Matchers mixed in:
|
||||||
|
*/
|
||||||
|
import org.scalatest.FunSuite
|
||||||
|
import org.scalatest.Matchers
|
||||||
|
|
||||||
|
import org.junit.runner.RunWith
|
||||||
|
import org.scalatest.junit.JUnitRunner
|
||||||
|
@RunWith(classOf[JUnitRunner])
|
||||||
|
class ListSuite extends FunSuite with Matchers {
|
||||||
|
|
||||||
|
test("An empty list should be empty") {
|
||||||
|
List() should be ('empty)
|
||||||
|
Nil should be ('empty)
|
||||||
|
}
|
||||||
|
|
||||||
|
test("A non-empty list should not be empty") {
|
||||||
|
List(1, 2, 3) should not be ('empty)
|
||||||
|
List("fee", "fie", "foe", "fum") should not be ('empty)
|
||||||
|
}
|
||||||
|
|
||||||
|
test("A list's length should equal the number of elements it contains") {
|
||||||
|
List() should have length (0)
|
||||||
|
List(1, 2) should have length (2)
|
||||||
|
List("fee", "fie", "foe", "fum") should have length (4)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
ScalaTest also supports the behavior-driven development style, in which you
|
||||||
|
combine tests with text that specifies the behavior being tested. Here's
|
||||||
|
an example whose text output when run looks like:
|
||||||
|
|
||||||
|
A Map
|
||||||
|
- should only contain keys and values that were added to it
|
||||||
|
- should report its size as the number of key/value pairs it contains
|
||||||
|
*/
|
||||||
|
import org.scalatest.FunSpec
|
||||||
|
|
||||||
|
class ExampleSpec extends FunSpec {
|
||||||
|
|
||||||
|
describe("An ArrayStack") {
|
||||||
|
|
||||||
|
it("should pop values in last-in-first-out order") {
|
||||||
|
val stack = new mutable.ArrayStack[Int]
|
||||||
|
stack.push(1)
|
||||||
|
stack.push(2)
|
||||||
|
assert(stack.pop() === 2)
|
||||||
|
assert(stack.pop() === 1)
|
||||||
|
}
|
||||||
|
|
||||||
|
it("should throw RuntimeException if an empty array stack is popped") {
|
||||||
|
val emptyStack = new mutable.ArrayStack[Int]
|
||||||
|
intercept[RuntimeException] {
|
||||||
|
emptyStack.pop()
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
|
@ -0,0 +1,31 @@
|
||||||
|
package samples
|
||||||
|
|
||||||
|
import org.junit.runner.RunWith
|
||||||
|
import org.specs2.mutable._
|
||||||
|
import org.specs2.runner._
|
||||||
|
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Sample specification.
|
||||||
|
*
|
||||||
|
* This specification can be executed with: scala -cp <your classpath=""> ${package}.SpecsTest
|
||||||
|
* Or using maven: mvn test
|
||||||
|
*
|
||||||
|
* For more information on how to write or run specifications, please visit:
|
||||||
|
* http://etorreborre.github.com/specs2/guide/org.specs2.guide.Runners.html
|
||||||
|
*
|
||||||
|
*/
|
||||||
|
@RunWith(classOf[JUnitRunner])
|
||||||
|
class MySpecTest extends Specification {
|
||||||
|
"The 'Hello world' string" should {
|
||||||
|
"contain 11 characters" in {
|
||||||
|
"Hello world" must have size(11)
|
||||||
|
}
|
||||||
|
"start with 'Hello'" in {
|
||||||
|
"Hello world" must startWith("Hello")
|
||||||
|
}
|
||||||
|
"end with 'world'" in {
|
||||||
|
"Hello world" must endWith("world")
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
|
@ -0,0 +1,4 @@
|
||||||
|
Hi,
|
||||||
|
This is the lines
|
||||||
|
from the test file.
|
||||||
|
Thanks.
|
Loading…
Reference in New Issue