3 pages from the guide: the cover, the contents (100 questions in 9 sections) and one complete question with its answer, code and interview tips.
Strings look simple until the interviewer asks what new String("a") == "a" prints, or why your code breaks on emoji. This guide covers everything about Java strings that comes up in interviews: the string pool and interning, immutability and memory, every important method, StringBuilder and concatenation, Unicode and charsets, regular expressions, and 31 string coding problems with solutions.
100 questions in 9 sections, 99 code examples and 15 diagrams in a 107-page PDF (2026 edition).
100 Java Collections Framework interview questions with detailed answers, code examples and performance tips.
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Predict the output of every snippet before reading the answer. Then solve the 31 coding problems on your own, and use the best-practices section as a checklist for code reviews.
== compares references. Literals and constant expressions are pooled (so == is true), while new String(...), runtime concatenation and most method results are fresh objects (so == is false) until you intern() them. Operands that are final variables initialised with constants are still constants.
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It covers this topic in depth. It is one topic from the TechTribers Java Interview Series, which has all 23 parts (1,200+ questions) in one bundle.
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A library of 12+ Java e-books covering basics, OOP, DSA, problem solving and interview prep.
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The all-in-one Java bundle: 3000+ interview questions, 50+ e-books, 500+ coding problems, DSA notes and bonus courses.
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