java - Asynchronous classes and its features -

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newbie in programming, trying understand asynchronous classes , benefits. features can included in class supports such operations? example too

the main benefit program multiple things @ same time, instead of waiting 1 thing finish before doing next.

simple example: want show information twitter , facebook. getting information typically takes quite time. instead of waiting twitter , waiting facebook, can query both @ same time , alerted when information available. halves time user has wait.


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