super keyword in Java

The super keyword can be used to invoke an overridden method in the superclass from the overriding method in the subclass

public class SuperClass {
   public void m1() {
      System.out.println("In SuperClass");
   }
}

public class SubClass extends SuperClass {
   public void m1() {
      super.m1();
      System.out.println("In SubClass");
   }
}

It can also be used to invoke a superclass constructor from the subclass constructor.

public class SuperClass {
   public SuperClass() {
      System.out.println("In SuperClass constructor");
   }
}

public class SubClass extends SuperClass {
   public SubClass() {
      super();
      System.out.println("In SubClass Constructor");
   }
}