How to seperate a Map of strings to List of Map of Strings according to a key in java?

If I have a map of String of Strings like this ,

{a[0].busId=1,a[0].busdetails=2,a[0].dataId=3,a[1].busId=1,a[2].busdetails=2,a[3].dataId=3}

I want to get a List of Map of Strings like this ,

[{a[0].busId=1,a[0].busdetails=2,a[0].dataId=3},{,a[1].busId=1,a[2].busdetails=2,a[3].dataId=3}]

Please help thanks