June 2018 Update

Task/Classes/Processing/classes-1

@@ -0,0 +1,17 @@
+class ProgrammingLanguage
+{
+   // instance variable:
+   private String name;
+   // constructor (let's use it to give the instance variable a value):
+   public ProgrammingLanguage(String name)
+   {
+      this.name = name;
+      // note use of "this" to distinguish the instance variable from the argument
+   }
+   // a method:
+   public void sayHello()
+   {
+      println("Hello from the programming language " + name);
+      // the method has no argument or local variable called "name", so we can omit the "this"
+   }
+}

Task/Classes/Processing/classes-2

@@ -0,0 +1,5 @@
+// instantiate the class:
+ProgrammingLanguage processing = new ProgrammingLanguage("Processing");
+
+// call the method:
+processing.sayHello();