title: What does super() mean in a constructor?
body: <p>What does the code</p>
  
  <pre><code>super();
  </code></pre>
  
  <p>do inside of a constructor? </p>
  
  <p>For example, here is a constructor for my class</p>
  
  <pre><code>public abstract class Rectangle extends AbstractShape
  {
  
  private double height, width;
  
  // Constructors...  
  public Rectangle()
  {
      super(); //this is how i inherit that point!
      height = -1;
      width = -1;
  }
  </code></pre>
  
  <p>Does it have something to do with super-classes?</p>