You want to replace all occurrences of the letter 'a' with 'b' in a string input. Which code correctly does this considering string immutability?

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Java - Strings and String Handling

You want to replace all occurrences of the letter 'a' with 'b' in a string input. Which code correctly does this considering string immutability?

Ainput.replace('a', 'b'); System.out.println(input);

Binput.charAt(0) = 'b'; System.out.println(input);

Cinput.toCharArray()[0] = 'b'; System.out.println(input);

Dinput = input.replace('a', 'b'); System.out.println(input);

Step-by-Step Solution

Solution:

Step 1: Understand replace() returns new string
The replace() method returns a new string with replacements but does not change the original.
Step 2: Assign the new string back to input
To update input, assign the result of replace() back to it before printing.
Final Answer:
input = input.replace('a', 'b'); System.out.println(input); -> Option D
Quick Check:
Assign replace result to variable to update string [OK]

Quick Trick: Assign replace() result to variable to update string [OK]

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