Explicit call to super class constructor in java

Normally, you don't explicitly write the constructor for your parent class, but there are two cases where this is necessary:

 

Passing parameters

You want to call a parent constructor which has parameters (the default construct has no parameters). For example, if you are defining a subclass of JFrame you might do the following.

class Chairman extends Employee {
    . . .
    //======== constructor
    public Chairman(String name_,String designation_) {
        super(name_);

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No parameterless constructor in parent

There is no parent constructor with no parameters. Sometimes is doesn't make sense to create an object without supplying parameters.