how to do super in java code example

Example: super keyword in java

// example on super keyword in java
class Manager
{
   int salary = 50000;
}
class Employee extends Manager
{
   int salary = 20000;
   void display(int salary)
   {
      // here refers to the parent class instance variable
      System.out.println(super.salary);
   }
   public static void main(String[] args)
   {
      Employee obj = new Employee();
      obj.display(30000);
   }
}