This article explains Java autoboxing and unboxing, the hidden IntegerCache mechanism, common comparison traps, null‑pointer risks, and performance overhead, providing code examples and interview‑style Q&A to deepen understanding of these language features.
This article explains Java's integer autoboxing cache, why the == operator returns true for Integer objects between -128 and 127, shows the underlying source code, and recommends using equals() for value comparison, with detailed examples and code snippets.
This article explains Java's Integer caching mechanism, why using == on Integer objects can give unexpected results outside the -128 to 127 range, how the Integer.valueOf method and the IntegerCache work, and how to inspect the behavior with javap and JVM options.
This article explains why Java’s Integer.valueOf may produce unexpected true/false results by revealing the compiler’s insertion of valueOf calls, the inner IntegerCache mechanism that caches values from –128 to 127, and how these affect object creation and program output.
