Given the code fragment: // line n1 switch (var) { case "1": System.out.println ("one"); break; } Which code fragment, when inserted at line n1, enables the code to print one?

Question

Options

• Achar var = '1';
• BString var = "1";
• Cint var = 1;
• DString var = 1;

• A
  9% (5)
• B
  86% (48)
• C
  4% (2)
• D
  2% (1)

Explanation

Option B works because Java's switch statement supports String types (since Java 7), and the case label "1" is a String literal - so declaring String var = "1" produces an exact match, printing one.

Why the distractors fail:

• A (char var = '1'): A char switch requires char case labels like case '1':, not String literals like case "1": - this causes a compile error.
• C (int var = 1): An int switch requires numeric or char case labels; case "1": is a String literal and is incompatible - compile error.
• D (String var = 1): Assigning the integer 1 directly to a String variable is a type mismatch - Java won't implicitly convert an int to a String.

Memory tip: Match the type of the variable to the type of the case labels. The case here uses double quotes ("1"), which is a String literal - so the variable must also be a String. Single quotes = char, no quotes = numeric.

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