What Is an Interface?

Author: TiagoTi

Bicycle/.classpath

@@ -6,13 +6,6 @@
 			<attribute name="maven.pomderived" value="true"/>
 		</attributes>
 	</classpathentry>
-	<classpathentry kind="src" output="target/test-classes" path="src/test/java">
-		<attributes>
-			<attribute name="optional" value="true"/>
-			<attribute name="maven.pomderived" value="true"/>
-			<attribute name="test" value="true"/>
-		</attributes>
-	</classpathentry>
 	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.7">
 		<attributes>
 			<attribute name="maven.pomderived" value="true"/>

Bicycle/.settings/org.eclipse.core.resources.prefs

@@ -1,4 +1,3 @@
 eclipse.preferences.version=1
 encoding//src/main/java=UTF-8
-encoding//src/test/java=UTF-8
 encoding/<project>=UTF-8

Bicycle/src/test/java/br/net/ti2/AppTest.java

@@ -0,0 +1,3 @@
+<factorypath>
+    <factorypathentry kind="VARJAR" id="M2_REPO/org/projectlombok/lombok/1.18.8/lombok-1.18.8.jar" enabled="true" runInBatchMode="false"/>
+</factorypath>

WhatIsAnInterface/.factorypath

@@ -0,0 +1,31 @@
+<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/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <groupId>docs.oracle.com.javase.tutorial.java.concepts.interface_</groupId>
+  <artifactId>WhatIsAnInterface</artifactId>
+  <version>0.0.1</version>
+  <packaging>jar</packaging>
+
+  <name>WhatIsAnInterface</name>
+  <url>http://maven.apache.org</url>
+
+  <properties>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+  </properties>
+
+  <dependencies>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>3.8.1</version>
+      <scope>test</scope>
+    </dependency>
+     <dependency>
+      <groupId>org.projectlombok</groupId>
+      <artifactId>lombok</artifactId>
+      <version>1.18.8</version>
+      <scope>provided</scope>
+    </dependency>
+  </dependencies>
+</project>

WhatIsAnInterface/pom.xml

@@ -0,0 +1,37 @@
+package docs.oracle.com.javase.tutorial.java.concepts.interface_.WhatIsAnInterface;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.Setter;
+import lombok.ToString;
+
+@Setter
+@ToString
+@AllArgsConstructor
+public @Data class ACMEBicycle implements Bicycle {
+
+    int cadence = 0;
+    int speed = 0;
+    int gear = 1;
+
+    public void changeCadence(int newCadence){
+        cadence = newCadence;
+    }
+
+    public void speedUp(int increment) {
+        speed += increment;   
+   }
+
+   public void applyBrakes(int decrement) {
+        speed -= decrement;
+   }
+
+   public void changeGear(int newGear){
+       gear = newGear;
+   }
+
+   public void printStates(){
+       System.out.println(toString());
+   }
+
+}

WhatIsAnInterface/src/main/java/docs/oracle/com/javase/tutorial/java/concepts/interface_/WhatIsAnInterface/ACMEBicycle.java

@@ -0,0 +1,14 @@
+package docs.oracle.com.javase.tutorial.java.concepts.interface_.WhatIsAnInterface;
+
+/**
+ * Hello world!
+ *
+ */
+public class App 
+{
+    public static void main( String[] args )
+    {
+        Bicycle b = new ACMEBicycle(1,2,3);
+        b.printStates();
+    }
+}

WhatIsAnInterface/src/main/java/docs/oracle/com/javase/tutorial/java/concepts/interface_/WhatIsAnInterface/App.java

@@ -0,0 +1,13 @@
+package docs.oracle.com.javase.tutorial.java.concepts.interface_.WhatIsAnInterface;
+
+interface Bicycle {
+    void changeCadence(int newValue);
+
+    void changeGear(int newValue);
+
+    void speedUp(int increment);
+
+    void applyBrakes(int decrement);
+    
+    void printStates();
+}

WhatIsAnInterface/src/main/java/docs/oracle/com/javase/tutorial/java/concepts/interface_/WhatIsAnInterface/Bicycle.java

@@ -0,0 +1,3 @@
+<factorypath>
+    <factorypathentry kind="VARJAR" id="M2_REPO/org/projectlombok/lombok/1.18.8/lombok-1.18.8.jar" enabled="true" runInBatchMode="false"/>
+</factorypath>