Resolving ClassCastException: Ljava.lang.Object; cannot be cast to Ljava.lang.Integer

Date: 2025-03-14

A ClassCastException in Java occurs when trying to cast an object to a type it's not an instance of, frequently seen as "Ljava.lang.Object cannot be cast to Ljava.lang.Integer". This often happens with non-generic collections or incorrect type assumptions. Solutions include using generics to enforce type safety at compile time, checking the object's type using instanceof before casting, and employing wrapper methods like Integer.valueOf() for safe conversions. Ignoring these precautions leads to runtime errors.

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