Collection classes in java

Collection classes in java

Normally a database is used for the data storage.The content/data is saved/stored in data base. Further more what is the reason using java collection classes saved/stored the data/content.I don't understand, what is the idea using java collection classes in project. Or the data is stored in both database and java collection classes

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Collection classes in java
is the reason using java collection classes saved/stored the data/content.I don't understand, what is the idea using java collection classes in project. Or the data is stored in both database and java collection classes
Collection classes in java
is the reason using java collection classes saved/stored the data/content.I don't understand, what is the idea using java collection classes in project. Or the data is stored in both database and java collection classes
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