Java library size

Question

If I have been given two Java libraries in Jar format, I do not have bells and whistles, while others have many of them that will mostly not be used ... my question is:

How does a large, mostly unused library affect application performance? Is the JVM a lazy class loading, does a large class library need more memory?

Answer 1

The short answer is that classes are loaded whenever they are needed first. Note that "required" also means "refers to any other class that is loading."

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Answer 2

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