Primeira aula - Hello World!

.gitignore

+# Created by https://www.toptal.com/developers/gitignore/api/java,intellij,maven
+# Edit at https://www.toptal.com/developers/gitignore?templates=java,intellij,maven
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+# End of https://www.toptal.com/developers/gitignore/api/java,intellij,maven
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.idea/.gitignore

+# Default ignored files
+/shelf/
+/workspace.xml

.idea/misc.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>
\ No newline at end of file

.idea/modules.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/HelloWorld.iml" filepath="$PROJECT_DIR$/HelloWorld.iml" />
+    </modules>
+  </component>
+</project>
\ No newline at end of file

HelloWorld.iml

+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/test" isTestSource="true" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="module-library" scope="TEST">
+      <library name="JUnit4">
+        <CLASSES>
+          <root url="jar://$MAVEN_REPOSITORY$/junit/junit/4.12/junit-4.12.jar!/" />
+          <root url="jar://$MAVEN_REPOSITORY$/org/hamcrest/hamcrest-core/1.3/hamcrest-core-1.3.jar!/" />
+        </CLASSES>
+        <JAVADOC />
+        <SOURCES />
+      </library>
+    </orderEntry>
+  </component>
+</module>
\ No newline at end of file

src/HelloWorld.java

+public class HelloWorld {
+
+    public static void main(String[] args) {
+        System.out.println("Hello, world!");
+    }
+}

test/HelloWorldTest.java

+import org.junit.Test;
+
+public class HelloWorldTest {
+
+    @Test
+    public void helloWorld() {
+        System.out.println("Hello, eCrescer!");
+        System.out.println("Meu primeiro teste unitário");
+    }
+}