Why Does My Java String `replace()` Method Not Seem to Work?
Java String replace Method Failure [Duplicate]
Certain Java implementations have reported the replace() method failing to adequately replace specific strings within a given String. This anomaly occurs due to the immutable nature of String objects.
Analysis of the Problematic Code:
In the provided code snippet:
<br>String delimiter = "<em></em>";<br>String html = "<html><head></head><body><strong>USERNAME</strong> AND <strong>PASSWORD</strong></body></html>";<br>Map<String, String> mp = new HashMap<String, String>();<br>mp.put("USERNAME", "User A");<br>mp.put("PASSWORD", "B");<br>for (Entry<String, String> entry : mp.entrySet()) {<br> html.replace(delimiter entry.getKey() delimiter, entry.getValue());<br>}<br>
Explanation of the Issue:
The replace() method in Java does not mutate the original String object. Instead, it returns a new String with the replacements applied. This is the point of contention: the original html variable continues to hold the original String value.
Resolution:
To rectify this, the code should be modified to explicitly reassign the html variable with the result of the replace() operation:
<br>html = html.replace(delimiter entry.getKey() delimiter, entry.getValue());<br>
Conclusion:
Understanding the immutability of String objects is crucial when utilizing methods like replace(). Assigning the returned String object to the original variable ensures the intended replacements take effect.
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