How to call multiple API in same time (asynchronous ) and collect data in one object in java

How to call multiple API in same time (asynchronous ) and collect data in one object in java

 have requirement to build one API which will call 6 API asynchronous and collect all data into one object.

 have requirement to build one API which will call 6 API asynchronous and collect all data into one object.

After collecting all data it will call other api for persist the data in database.

Please let me know which framework will be most suitable for this requirement.

Most prefer we want this in java.

Thanks In Advance.

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