[Solved] Which of the following correctly defines a default constructor in Java? — Ans: public class Sample { Sample() { } } | Java

Java - Constructors

Which of the following correctly defines a default constructor in Java?

Apublic class Sample { Sample(int x) { } }

Bpublic class Sample { void Sample() { } }

Cpublic class Sample { public void Sample() { } }

Dpublic class Sample { Sample() { } }

Step-by-Step Solution

Solution:

Step 1: Identify constructor syntax
A constructor has no return type and its name matches the class name.
Step 2: Check each option
public class Sample { Sample() { } } defines a constructor with no parameters and no return type, which is a default constructor.
public class Sample { void Sample() { } } and C have return types (void), so they are methods, not constructors.
public class Sample { Sample(int x) { } } is a parameterized constructor, not default.
Final Answer:
public class Sample { Sample() { } } correctly defines a default constructor.
Quick Check:
Constructor name = class name, no return type [OK]

Quick Trick: Constructor has no return type and matches class name [OK]

Common Mistakes:

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Which of the following correctly defines a default constructor in Java?