Given the string input = "apple,banana,orange", which code snippet correctly replaces all commas with semicolons and converts the result to uppercase?

hard📝 Application Q15 of 15

Java - Strings and String Handling

Given the string input = "apple,banana,orange", which code snippet correctly replaces all commas with semicolons and converts the result to uppercase?

Ainput.replaceFirst(",", ";").toUpperCase();

Binput.toUpperCase().replaceFirst(",", ";");

Cinput.replace(",", ";").toUpper();

Dinput.replaceAll(",", ";").toUpperCase();

Step-by-Step Solution

Solution:

Step 1: Understand replace() vs replaceAll()
Both replace() and replaceAll() can replace characters, but replaceAll() uses regex and is safer for multiple replacements.
Step 2: Check method chaining and correctness
A and B use replaceFirst() which only replaces the first comma. C uses invalid toUpper().
Step 3: Choose best practice
Using replaceAll() with chaining to toUpperCase() is correct and clear.
Final Answer:
input.replaceAll(",", ";").toUpperCase(); -> Option D
Quick Check:
Replace commas then uppercase = replaceAll + toUpperCase() [OK]

Quick Trick: Chain replaceAll() then toUpperCase() for clean transformation [OK]

Common Mistakes:

Using toUpper() instead of toUpperCase()
Using replaceFirst() which only replaces the first occurrence
Confusing replace() and replaceAll() usage

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More Java Quizzes

Given the string input = "apple,banana,orange", which code snippet correctly replaces all commas with semicolons and converts the result to uppercase?

Step 1: Understand replace() vs replaceAll()

Step 2: Check method chaining and correctness

Step 3: Choose best practice

Final Answer:

Quick Check:

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