New Java interop snippet with both Java and Scala.

Author: sjrd

_includes/bullet-java-interop.html

@@ -1,14 +1,56 @@
-<figure class="code">
-  <figcaption>Java interoperability</figcaption>
-  <pre><code>import java.io.{PrintStream,FileOutputStream}
+<div class="java-interop-wrapper" style="width: 500px">
+<figure class="code java-interop1" style="margin-top: 20px;">
+  <figcaption>Author.scala</figcaption>
+  <pre><code>class Author(val firstName: String,
+    val lastName: String) extends Comparable[Author] {
 
-val people: Array[Person]
+  override def compareTo(that: Author) = {
+    val lastNameComp = this.lastName compareTo that.lastName
+    if (lastNameComp != 0) lastNameComp
+    else this.firstName compareTo that.firstName
+  }
+}
 
-// Create Java output streams for writing to `log.txt`.
-val ps = new PrintStream(new FileOutputStream("log.txt"))
+object Author {
+  def loadAuthorsFromFile(file: java.io.File): List[Author] = ???
+}</code></pre>
+</figure>
+<figure class="code java-interop2" style="margin-top: 10px;">
+  <figcaption>App.java</figcaption>
+  <pre><code>import static scala.collection.JavaConversions.asJavaCollection;
+
+public class App {
+    public List&lt;Author&gt; loadAuthorsFromFile(File file) {
+        return new ArrayList&lt;Author&gt;(asJavaCollection(
+            Author.loadAuthorsFromFile(file)));
+    }
 
-// Print contents of `people` to `log.txt`.
-people foreach { p =>
-  ps.println(s"${p.name} is ${p.age} years old")  // uses string interpolation
+    public void sortAuthors(List&lt;Author&gt; authors) {
+        Collections.sort(authors);
+    }
+
+    public void displaySortedAuthors(File file) {
+        List&lt;Author&gt; authors = loadAuthorsFromFile(file);
+        sortAuthors(authors);
+        for (Author author : authors) {
+            System.out.println(
+                author.lastName() + ", " + author.firstName());
+        }
+    }
 }</code></pre>
 </figure>
+</div>
+
+<div class="snippet-explanation" style="width: 370px;">
+<h3>Combine Scala and Java seamlessly</h3>
+<p>Scala classes are ultimately JVM classes. You can create Java objects, call
+their methods and inherit from Java classes transparently from Scala.
+Similarly, Java code can reference Scala classes and objects.</p>
+<p>
+In this example, the scala class <code>Author</code> implements the Java
+interface <code>Comparable&lt;T&gt;</code> and work with Java
+<code>File</code>s. The Java code uses a method from the companion object
+<code>Author</code>, and accesses fields of the <code>Author</code> class.
+It also uses <code>JavaConversions</code> to convert between Scala collections
+and Java collections.
+</p></div>

resources/css/main.css

@@ -233,15 +233,15 @@ a.brand {
   height: inherit;
   vertical-align: 6px;
   text-align: left;
-  -webkit-transition: all 300ms cubic-bezier(.6, 0, .6, 1); 
-     -moz-transition: all 300ms cubic-bezier(.6, 0, .6, 1); 
-      -ms-transition: all 300ms cubic-bezier(.6, 0, .6, 1); 
-       -o-transition: all 300ms cubic-bezier(.6, 0, .6, 1); 
+  -webkit-transition: all 300ms cubic-bezier(.6, 0, .6, 1);
+     -moz-transition: all 300ms cubic-bezier(.6, 0, .6, 1);
+      -ms-transition: all 300ms cubic-bezier(.6, 0, .6, 1);
+       -o-transition: all 300ms cubic-bezier(.6, 0, .6, 1);
           transition: all 300ms cubic-bezier(.6, 0, .6, 1);
-  -webkit-transform: translateX(-115px); 
-     -moz-transform: translateX(-115px); 
-      -ms-transform: translateX(-115px); 
-       -o-transform: translateX(-115px); 
+  -webkit-transform: translateX(-115px);
+     -moz-transform: translateX(-115px);
+      -ms-transform: translateX(-115px);
+       -o-transform: translateX(-115px);
           transform: translateX(-115px);
 }
 #download-button:hover .slider {
@@ -258,10 +258,10 @@ a.brand {
   vertical-align: -7px;
 }
 #download-button:hover span {
-  -webkit-transform: translateX(0); 
-     -moz-transform: translateX(0); 
-      -ms-transform: translateX(0); 
-       -o-transform: translateX(0); 
+  -webkit-transform: translateX(0);
+     -moz-transform: translateX(0);
+      -ms-transform: translateX(0);
+       -o-transform: translateX(0);
           transform: translateX(0);
 }
 #download-button:hover .icon {
@@ -2403,7 +2403,7 @@ div#toc ul > li + ul > li { margin-top: 12px; }
   margin-bottom: 10px;
 }
 
-.traits, .concurrency {
+.traits, .concurrency, .java-interop-wrapper {
   float: left;
 }