❓ 𝗦𝘁𝗶𝗹𝗹 𝘀𝘁𝗿𝘂𝗴𝗴𝗹𝗶𝗻𝗴 𝘄𝗶𝘁𝗵 𝗝𝗮𝘃𝗮 𝗰𝗼𝗱𝗶𝗻𝗴 𝗿𝗼𝘂𝗻𝗱𝘀?

❓ 𝗦𝘁𝗶𝗹𝗹 𝘀𝘁𝗿𝘂𝗴𝗴𝗹𝗶𝗻𝗴 𝘄𝗶𝘁𝗵 𝗝𝗮𝘃𝗮 𝗰𝗼𝗱𝗶𝗻𝗴 𝗿𝗼𝘂𝗻𝗱𝘀?

The issue isn’t your logic—it’s the lack of pattern recognition. As an SDET, knowing when to apply which pattern is the game-changer.

👉 𝗖𝗼𝗹𝗹𝗲𝗰𝘁𝗶𝗼𝗻𝘀 & 𝗠𝗮𝗽𝘀 – 𝗧𝗵𝗲 𝗖𝗼𝗿𝗲 𝗼𝗳 𝗔𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗼𝗻 𝗗𝗮𝘁𝗮 𝗛𝗮𝗻𝗱𝗹𝗶𝗻𝗴

When to use: Working with test data, mapping request/response pairs, or storing UI elements.

Example:

Map locators = new HashMap<>();

locators.put("loginBtn", "//button[text()='Login']");

Coding Problem Example:

Count frequency of characters or words → Use HashMap.

👉 𝗧𝘄𝗼 𝗣𝗼𝗶𝗻𝘁𝗲𝗿𝘀 – 𝗙𝗼𝗿 𝗦𝘁𝗿𝗶𝗻𝗴𝘀, 𝗔𝗿𝗿𝗮𝘆s

When to use: Useful in validations like palindromes, comparing logs, or merging sorted logs.

Example:

int i = 0, j = arr.length - 1;

while (i < j) {

  if (arr[i] != arr[j]) return false;

  i++; j--;

}

Coding Problem Example:

Is string a palindrome? Find pairs with given sum.

👉 𝗦𝗹𝗶𝗱𝗶𝗻𝗴 𝗪𝗶𝗻𝗱𝗼𝘄 – 𝗙𝗼𝗿 𝗦𝘂𝗯𝘀𝘁𝗿𝗶𝗻𝗴𝘀 𝗮𝗻𝗱 𝗣𝗲𝗿𝗳𝗼𝗿𝗺𝗮𝗻𝗰𝗲 𝗪𝗶𝗻𝗱𝗼𝘄𝘀

When to use: Identify performance drops, memory leaks, or longest continuous pass/fail patterns in logs.

Example:

Find the longest substring with no repeating characters.

👉 𝗦𝘁𝗿𝗶𝗻𝗴 𝗠𝗮𝗻𝗶𝗽𝘂𝗹𝗮𝘁𝗶𝗼𝗻 – 𝗙𝗼𝗿 𝗖𝗹𝗲𝗮𝗻𝘂𝗽𝘀, 𝗣𝗮𝗿𝘀𝗶𝗻𝗴, 𝗮𝗻𝗱 𝗙𝗼𝗿𝗺𝗮𝘁𝘁𝗶𝗻𝗴

When to use:When cleaning API responses, generating dynamic test data, or parsing HTML/XML/text logs.

Example:

String response = "status=200&message=Success";

String[] parts = response.split("&");

for (String part : parts) {

  String[] keyValue = part.split("=");

  System.out.println(keyValue[0] + ": " + keyValue[1]);

}

Coding Problem Example:

Reverse a string, remove duplicates, extract digits from test input, etc.

👉 𝗧𝗿𝘆-𝗖𝗮𝘁𝗰𝗵 – 𝗙𝗼𝗿 𝗦𝗮𝗳𝗲 𝗔𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗼𝗻 𝗖𝗼𝗱𝗲

When to use:Handling exceptions during test execution, parsing, or when dealing with unstable inputs like API responses, browser states, or external systems.

Example:

Handle potential exceptions during array access or parsing

try {

  int result = Integer.parseInt("123a"); // Will throw NumberFormatException

  System.out.println("Parsed number: " + result);

} catch (NumberFormatException e) {

  System.err.println("Invalid number format: " + e.getMessage());

}

👉 𝗥𝗲𝗴𝗲𝘅 & 𝗣𝗮𝘁𝘁𝗲𝗿𝗻 𝗠𝗮𝘁𝗰𝗵𝗶𝗻𝗴 – 𝗙𝗼𝗿 𝗟𝗼𝗴 𝗙𝗶𝗹𝗲 𝗩𝗮𝗹𝗶𝗱𝗮𝘁𝗶𝗼𝗻

Extract timestamps, validate test output format, match dynamic URLs.

Example:

Pattern p = Pattern.compile("Error: (\\d+)");

Matcher m = p.matcher(logLine);

if (m.find()) Sysout("Error Code: " + m.group(1));

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