diff --git a/docs/java/basics/classes.md b/docs/java/basics/classes.md
new file mode 100644
index 0000000..16fb492
--- /dev/null
+++ b/docs/java/basics/classes.md
@@ -0,0 +1,9 @@
+# Classes
+
+## Generics
+
+Generics allow you to create a class that can hold many different kinds of data types, and specify an upper bound for what kind of interfaces are allowed to be stored and manipulated.
+
+```java
+
+```
diff --git a/docs/java/basics/interfaces.md b/docs/java/basics/interfaces.md
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+++ b/docs/java/basics/interfaces.md
@@ -0,0 +1,36 @@
+# Interfaces
+
+## Common Interfaces to Implement
+
+### Comparator
+
+Compares two instances of a class.
+
+```java
+class StudentGPAComparator implements Comparator<Student> {
+    @Override
+    public int compare(Student o1, Student o2) {
+        return (o1.gpa + o1.name).compareTo(o2.gpa + o2.name);
+    }
+}
+
+public static void main() {
+    Comparator<Student> gpaSorter = new StudentGPAComparator();
+    Arrays.sort(students, gpaSorter);
+    Arrays.sort(students, gpaSorter.reversed());
+}
+
+```
+
+### Comparable
+
+Similar to Comparator, except this is implemented directly on the classes you are comparing. Without specificing a type, you will receive an `Object` to your `compareTo` function.
+
+```java
+class Student implements Comparable<Student> {
+    @Override
+    public int compareTo(Student o) {
+        return this.name.compareTo(o.name);
+    }
+}
+```
diff --git a/docs/java/basics/types.md b/docs/java/basics/types.md
new file mode 100644
index 0000000..f54cd23
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+++ b/docs/java/basics/types.md
@@ -0,0 +1 @@
+# Types
diff --git a/docs/java/sidebar.json b/docs/java/sidebar.json
index 32bf35d..e5b3e84 100644
--- a/docs/java/sidebar.json
+++ b/docs/java/sidebar.json
@@ -1,9 +1,11 @@
 [
-    {
-      "text": "Basics",
-      "items": [
-        { "text": "Introduction", "link": "/java/" }
-      ]
-    }
-  ]
-  
\ No newline at end of file
+  {
+    "text": "Basics",
+    "items": [
+      { "text": "Introduction", "link": "/java/" },
+      { "text": "Types", "link": "/java/basics/types" },
+      { "text": "Classes", "link": "/java/basics/classes" },
+      { "text": "Interfaces", "link": "/java/basics/interfaces" }
+    ]
+  }
+]