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I Found a SECRET HashMap Nobody Talks About

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I Found a SECRET HashMap Nobody Talks About

You put a value in a HashMap. You know it’s there. But when you try to get it back… it’s null. This isn’t a Java bug. It’s an equals() / hashCode() contract violation. In this video, we do a full HashMap autopsy using a simple ProductId key class: We store "Gaming Laptop" under new ProductId("A-100") We ...

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