Grokking The Java Developer Interview: More Than 200 Questions To Crack The Java, Spring, SpringBoot & Hibernate Interview

Question 48: What is Constructor Chaining in java?
Answer: when one constructor calls another constructor, it is known
as constructor chaining. This can be done in two ways:
- this() : it is used to call the same class constructor
- super() : it is used to call the parent class
constructor
this() Example:

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C:\Users\jjatin\Desktop\Different Versions\All_Photos\Question
48\this() Example\color1.png

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C:\Users\jjatin\Desktop\Different Versions\All_Photos\Question
48\this() Example\color2.png

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Output:
C:\Users\jjatin\Desktop\Different
Versions\All_Photos\Question 48\this()
Example\output.png

---

super() example:

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C:\Users\jjatin\Desktop\Different Versions\All_Photos\Question
48\super() Example\color1.png

---

C:\Users\jjatin\Desktop\Different Versions\All_Photos\Question
48\super() Example\color2.png

---

Output:
C:\Users\jjat
in\Desktop\Dif
ferent
Versions\All_
Photos\Quest
ion 48\super()
Example\outp
ut.png
Some points to remember:
- this() can call same class constructor only
- super() can call immediate super class constructor only
- this() and super() call must be the first statement,
because of this reason both cannot be used at the same
time
- you must use super() to call the parent class constructor
but if you do not provide a super() call, JVM will put it
automatically