🌟 Java : Convert String Case — Uppercase & Lowercase in Java!
🔤 "Flip Between Upper and Lower Case with Ease!"
🧩 What’s the Purpose of This Program?
This Java program demonstrates how to convert the case of text using built-in String methods:
Converts a given word to uppercase
Converts it to lowercase
Prints the original and converted results
This is useful when performing case-insensitive comparisons, formatting output, or normalizing input from users or files.
🧠 Step-by-Step Breakdown: What’s Happening?
1️⃣ Define the Original String
The program begins with a string "Selenium".
This acts as the input text to convert.
2️⃣ Convert to Uppercase
Uses toUpperCase() to change every character in the string to uppercase.
Result: "SELENIUM".
3️⃣ Convert to Lowercase
Uses toLowerCase() to change all characters to lowercase.
Result: "selenium".
4️⃣ Display All Versions
Prints:
The original string
The uppercase version
The lowercase version
🎓 Top 5 Java String Case Conversion Interview Questions
1. Q: What does toUpperCase() do in Java?
👉 Converts all characters of a string to uppercase using the system’s default locale.
2. Q: What about toLowerCase()?
👉 Converts all characters of a string to lowercase, also using the default locale.
3. Q: How do you handle locale-specific case conversion?
👉 Use toUpperCase(Locale) or toLowerCase(Locale) to convert text based on specific cultural rules (e.g., Turkish i vs. I).
4. Q: Does case conversion modify the original string?
👉 No, because strings in Java are immutable. Each method returns a new string.
5. Q: How do you compare strings while ignoring case?
👉 Use equalsIgnoreCase() or convert both strings to the same case before comparing.
🧾 Conclusion: Case Conversion is a Must-Know String Tool
Knowing how to convert between upper and lower case in Java helps with text normalization, user input validation, and flexible comparisons. It’s a simple but powerful part of Java’s string toolkit!
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