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Patterns & Effective Java Probes

Singleton variants, builder vs record, strategy with lambdas, visitor vs sealed types and senior interview traps.

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Why this matters

  • Interviewers use patterns to probe design judgement, not to hear Gang of Four names.
  • Modern Java answers should mention records, sealed types, and lambdas where they replace ceremony.

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Test yourself

Answer these before moving on — recall is what makes it stick.