java - StringBuffer is obsolete? -

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in book "effective java", josh bloch says

stringbuffer largely obsolete , should replaced non-synchronized implementation 'stringbuilder'

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but in experience, i've still seen widespread use of stringbuffer class. why stringbuffer class obsolete , why should stringbuilder preferred on stringbuffer except increased performance due non-synchronization?

it's obsolete in new code on java 1.5 should use stringbuilder - it's very rare need build strings in thread-safe manner, why pay synchronization cost?

i suspect code see using stringbuffer falls buckets of:

  • written before java 1.5
  • written maintain compatibility older jdks
  • written people don't know stringbuilder
  • autogenerated tools don't know stringbuilder

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