Building Strings in Java: String vs StringBuffer Performance Comparison (With Real Benchmark)
In this detailed Java tutorial, we compare String vs StringBuffer when building sentences dynamically.
Many developers still use the + operator inside loops — but did you know it can cause serious performance issues?
In this video, we:
✔ Build a sentence dynamically using normal String
✔ Build the same sentence using StringBuffer.append()
✔ Measure execution time using System.nanoTime()
✔ Analyze time complexity (O(n²) vs O(n))
✔ Explain internal memory behavior
✔ Understand why StringBuffer is more efficient
Key Concepts Covered:
• String immutability
• Object creation overhead
• append() time complexity
• Internal char[] resizing
• Amortized O(1) explanation
• Garbage collection impact
Interview Insight:
Using String in loops leads to O(n²) complexity,
while StringBuffer operates in O(n) overall time.
#Java #String #StringBuffer #JavaPerformance #JavaInterviewQuestions #MutableVsImmutable #CodingTips #JavaTutorial #BigO #AnalystAdda
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