• For repeated string concatenation, use StringBuilder over the string concatenation opertator + to concatenate n strings of max length k in O(n*k) time as opposed to O(n^2*k) time.
• Sidenote: StringBuilder vs StringBuffer
  • StringBuffer is synchronized whereas StringBuilder is not, which means StringBuilder is faster, but not thread-safe.
  • Use StringBuffer for thread-safety and StringBuilder for performance.

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