✏️ Explanatory Question

[String and Arrays]

Question:

Find the output of the following snippet: 

void check1()
{
    String x[] = {"Kolkata","Chennai","Delhi"};
    String y[] = {"Kolkata","Chennai","Delhi"};

    System.out.println(x.equals(y));
}

Answer:

false

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📘 Detailed Answer
🟢 Easy
← Previous [Computational Complexity and Big-O Notation] Question: Finding the greatest common divisor (GCD) of two positive integers results in the time complexity of O(log N), where N is the larger number of two inputs. Justify the statement.
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Answer with Explanation

Explanation:

In Java, arrays are objects.

The method: 

x.equals(y)

does NOT compare the contents of the arrays. Instead, it compares the references (memory addresses) of the arrays.

Here:

  • x and y are two different array objects
  • Both arrays contain same elements
  • But they are stored in different memory locations

Therefore: 

x.equals(y)

returns: 

false

Important Concept:

  • For arrays, equals() checks reference equality
  • To compare array contents, use: 
Arrays.equals(x, y)

Conclusion:

  • x and y have same contents ✅
  • x and y are different objects ✅
  • Hence output = false
← Previous [Computational Complexity and Big-O Notation] Question: Finding the greatest common divisor (GCD) of two positive integers results in the time complexity of O(log N), where N is the larger number of two inputs. Justify the statement.