循环语法
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153
pom.xml
153
pom.xml
@@ -1,73 +1,88 @@
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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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<groupId>top.fjy8018</groupId>
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<artifactId>helloscala</artifactId>
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<version>1.0-SNAPSHOT</version>
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<name>${project.artifactId}</name>
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<description>My wonderfull scala app</description>
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<inceptionYear>2010</inceptionYear>
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<licenses>
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<license>
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<name>My License</name>
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<url>http://....</url>
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<distribution>repo</distribution>
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</license>
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</licenses>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>top.fjy8018</groupId>
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<artifactId>helloscala</artifactId>
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<version>1.0-SNAPSHOT</version>
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<name>${project.artifactId}</name>
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<description>My wonderfull scala app</description>
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<inceptionYear>2010</inceptionYear>
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<licenses>
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<license>
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<name>My License</name>
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<url>http://....</url>
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<distribution>repo</distribution>
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</license>
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</licenses>
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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>2.11.8</scala.version>
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</properties>
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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>2.11.8</scala.version>
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<spark.version>2.3.1</spark.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>${scala.version}</version>
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</dependency>
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</dependencies>
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<dependencies>
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<dependency>
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<groupId>org.scala-lang</groupId>
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<artifactId>scala-library</artifactId>
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<version>${scala.version}</version>
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</dependency>
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<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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<groupId>org.scala-tools</groupId>
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<artifactId>maven-scala-plugin</artifactId>
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<version>2.15.0</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>-make:transitive</arg>
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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>2.6</version>
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<configuration>
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<useFile>false</useFile>
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<disableXmlReport>true</disableXmlReport>
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<!-- If you have classpath issue like NoDefClassError,... -->
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<!-- useManifestOnlyJar>false</useManifestOnlyJar -->
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<includes>
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<include>**/*Test.*</include>
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<include>**/*Suite.*</include>
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</includes>
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</configuration>
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</plugin>
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</plugins>
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</build>
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<dependency>
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<groupId>org.apache.spark</groupId>
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<artifactId>spark-core_2.11</artifactId>
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<version>${spark.version}</version>
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</dependency>
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<!-- https://mvnrepository.com/artifact/org.apache.spark/spark-sql -->
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<dependency>
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<groupId>org.apache.spark</groupId>
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<artifactId>spark-sql_2.11</artifactId>
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<version>2.3.1</version>
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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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<groupId>org.scala-tools</groupId>
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<artifactId>maven-scala-plugin</artifactId>
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<version>2.15.0</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>2.6</version>
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<configuration>
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<useFile>false</useFile>
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<disableXmlReport>true</disableXmlReport>
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<!-- If you have classpath issue like NoDefClassError,... -->
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<!-- useManifestOnlyJar>false</useManifestOnlyJar -->
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<includes>
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<include>**/*Test.*</include>
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<include>**/*Suite.*</include>
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</includes>
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</configuration>
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</plugin>
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</plugins>
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</build>
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</project>
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@@ -12,6 +12,17 @@ object FunctionApp {
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// 调用无参方法可以不加括号
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printHello
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printHello("scala")
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// 调用带默认值的方法不可以不加括号
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defaultParam()
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defaultParam("new value")
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// 支持自定义参数顺序
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println(sum(y = 2,x = 1))
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printAllInt(1,2,3,4,5,6)
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}
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def add(x:Int,y:Int):Int={
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@@ -29,4 +40,27 @@ object FunctionApp {
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def printHello()= println("Hello world!")
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/**
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* 支持函数重载
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* @param n
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*/
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def printHello(n:String)=println("Hello world " + n)
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/**
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* 支持参数默认值
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* @param n
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*/
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def defaultParam(n:String="defaultValue")=println("value:" + n)
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/**
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* 可变参数
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* @see org.apache.spark.sql.Dataset#select(org.apache.spark.sql.TypedColumn, org.apache.spark.sql.TypedColumn, org.apache.spark.sql.TypedColumn, org.apache.spark.sql.TypedColumn, org.apache.spark.sql.TypedColumn)
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* @param numbers
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*/
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def printAllInt(numbers:Int*): Unit ={
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for (number <- numbers){
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print(number +",")
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}
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}
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}
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70
src/main/scala/top/fjy8018/scala/Loop.scala
Normal file
70
src/main/scala/top/fjy8018/scala/Loop.scala
Normal file
@@ -0,0 +1,70 @@
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package top.fjy8018.scala
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/**
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* F嘉阳
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* 2018-11-26 17:03
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*/
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object Loop {
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val list = Array("a","b","c","d")
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def main(args: Array[String]): Unit = {
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printTest
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println()
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loop1
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println()
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loop2()
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println()
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loop3
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println()
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rangeTest1
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rangeTest2
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sumTest
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}
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def printTest()=print(1 to 10)
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def loop1(): Unit ={
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for (l <- list){
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print(l)
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}
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}
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/**
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* 类似java lambda函数表达式
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*/
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def loop2(): Unit ={
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list.foreach(l => print(l))
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}
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/**
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* 带条件循环表达式
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*/
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def loop3(): Unit ={
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for (i<- 1 to 10 if i%2==0){
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print(i+" ")
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}
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}
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def rangeTest1(): Unit ={
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// 指定步长，Range为to函数的底层实现
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print(Range(1,10,2))
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println()
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println(Range(10,1,-3))
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}
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/**
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* until 左闭右开，to左闭右闭
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*/
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def rangeTest2(): Unit ={
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println(1 until 10)
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}
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def sumTest(): Unit ={
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var (num,sum) = (100,0)
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while (num>0){
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sum += num
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num -= 1
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}
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println(sum)
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}
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}
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