What is the output for the below code?

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Jatin Dubey • 3.72K Points
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Q. What is the output for the below code?

Code:

public class Test{
      int _$;
      int $7;
      int do;

      public static void main(String argv[]){
            Test test = new Test();
            test.$7=7;
            test.do=9;
            System.out.println(test.$7);
            System.out.println(test.do);
            System.out.println(test._$);
      }
}

(A) 7 9 0

(B) 7 0 0

(D) Compile error - do is not valid identifier.

Correct answer: Option(D)

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Explanation by: Jatin Dubey

$7 is valid identifier. Identifiers must start with a letter, a currency character ($), or underscore ( _ ). Identifiers cannot start with a number. You can't use a Java keyword as an identifier. do is a Java keyword.

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