Which of the following are valid declarations 1. void method(int... x){}; 2. void method(int.. x){}; 3. void method(int.. .x){}; 4. void method(int ...x){}; 5. void method(int... x){}; 6. void method(int ... x){}; 7. void method(int x, int... y){}; 8. void method(int... x, int y){}; 9. void method(int... x,int... y){};

Interview Questions and Answers

Q1. Which of the following are valid declarations

1. void method(int... x){};
2. void method(int.. x){};
3. void method(int.. .x){};
4. void method(int ...x){};
5. void method(int... x){};
6. void method(int ... x){};
7. void method(int x, int... y){};
8. void method(int... x, int y){};
9. void method(int... x,int... y){};

Core Java

Ans. 1st is a valid and standard declaration.

2nd results in compilation error as only 2 dots are there.

3rd results in compilation error as three dots are not consecutive and broken.

4 through 6 may not be standard and ideal way of declarations but they are valid and will compile and work fine.

7 is valid declaration.

8 and 9 will result in compilation error as var args can only be provided to last argument.

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Related Questions

What is the difference between these two method declarations ?

private static void method(String[] arg)

and

private static void method(String... arg)

Can we overload method as following ?

void method(int... x){};
void method(int[] x){};

Which of the following is not valid var args declaration ?

Do you prefer using var args ?

Which of the following is false about var args ?

What are var args ?

or

What is the use of var args ?

Why following method declarations are not valid ?

void method(int... x, int y){};
void method(int... x,int... y){};

Which method will get called if we call it as method(1)

void method(int x ){};
void method(int... x){};

Do you see any problem with this code

public class BuggyBread {

   public static void main(String[] args) {
      method("Hello","World");
   }

   private static void method(String... args){
      for(String arg:args){
         System.out.println(arg);
      }
   }
}

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