Collections

Java HashMap Tutorial with Examples: put, get, Iterate, Count, and Sort by Value

Submitted by jaypabs on

Almost every real program needs to look something up quickly: a student's grade by ID number, a product's price by its code, or how many times a word appears in a text. In Java, the go-to tool for this job is the HashMap. It stores data as key-value pairs and can find a value by its key almost instantly, no matter how many entries it holds.

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