Java - Inheritance
In Java, how do you correctly invoke another constructor of the same class from within a constructor?
In Java, how do you correctly invoke another constructor of the same class from within a constructor?
easy📝 Syntax Q3 of 15
Step-by-Step Solution
Solution:
Step 1: Understand constructor chaining
Constructor chaining means calling one constructor from another within the same class.Step 2: Syntax for chaining
In Java, this is done usingthis()and it must be the first statement in the constructor.Step 3: Analyze options
By usingthis()as the first statement inside the constructor correctly states the use ofthis()as the first statement. By calling the constructor name directly inside the constructor body is invalid syntax. By usingsuper()inside the constructor calls the superclass constructor, not the same class constructor. By creating a new object of the class inside the constructor creates a new object, not chaining constructors.Final Answer:
By usingthis()as the first statement inside the constructor -> Option BQuick Check:
Constructor chaining requiresthis()first [OK]
Quick Trick: Use this() as first statement to chain constructors [OK]
Common Mistakes:
- Calling another constructor by name directly
- Using super() instead of this() for same class chaining
- Placing this() call after other statements
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