In Java, constructor of base class with no argument gets automatically called in derived class constructor. For example, output of following program is:
Base Class Constructor Called
Derived Class Constructor Called
But, if we want to call parameterized contructor of base class, then we can call it using super(). The point to note is base class constructor call must be the first line in derived class constructor. For example, in the following program, super(_x) is first line derived class constructor.
x = 10, y = 20
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