Using super keyword refers to the constructor from superclass : super « Modifiers « SCJP

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2. Modifiers
3. super

public class MainClass {
  public static void main(String[] argv) {
    new MySubclass();
  }
}

class MyClass {
  public MyClass() {
  }

}

class MySubclass extends MyClass {
  public MySubclass() {
    super();
  }

}