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"
   }
}