In Pictures: 15 things we hate about Java

Slow startup times, null pointers, security flaws -- Java's ongoing success leaves plenty to complain about

Primitive wrappers to use data structures The Java Collections classes and other data structures are nice, but they require you to wrap your basic values in objects to use them. That means a four-byte int turns into a big fat object with all the weight and creation time of an object. Some programmers have written their own data structures with basic primitives to avoid this issue, but it's probably too late for mainstream Java. We're stuck with making the distinction between a four-byte int and an Integer object.

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