This guide explains the fundamental distinction between Java's == operator and the equals() method, covering primitive vs. reference comparisons, default implementations, common pitfalls like string interning and Integer caching, and the essential contract with hashCode for reliable object equality.
The article explains why comparing two Integer objects with `==` returns true for values within -128 to 127 but false for larger numbers, detailing Java’s integer cache, reference vs. value equality, and the correct use of `.equals()` to avoid subtle bugs.
This article explains why using the == operator on two Java Integer objects can yield true for values between -128 and 127 but false for larger numbers, detailing the Integer cache mechanism, reference vs value comparison, and the proper use of equals for value equality.
This article explains why Java’s Integer autoboxing caches values between -128 and 127, causing the == operator to report true for those numbers, and shows how to avoid the pitfall by using equals() instead.
