Java Variable Arguments-interview
Q1. What are varargs in Java and why are they used?
Varargs allow a method to accept a variable number of arguments, making code flexible and reducing the need for method overloading.
Q2. Can you give a real-world example where varargs are commonly used?
Yes, in logging frameworks (
log(String... messages)) and utility methods like String.format() or calculating sums and maximums.
Q3. Can we use varargs with other parameters in a method?
Yes, but the varargs parameter must always be the last one in the method.
Q4. What are the advantages and limitations of varargs?
Advantages: reduces method overloading and makes code cleaner.
Limitations: slight performance overhead and reduced clarity if overused.
Q5. Can varargs cause ambiguity in method overloading?
Yes, if not used carefully, varargs can cause ambiguity in overloaded methods because it can match multiple signatures.
Q6. How do you declare a varargs method?
By using ... after the data type in the parameter list.
void display(int... numbers) { }