java - Create a Map of SortedMap from a Map using lambda expression -


i have map having entries below

[{a.p=aa}, {a.r=aaaa}, {a.q=aaa}, {a.s=aaaaa}, {b.p=bb},   {b.r=bbbb}, {c.r=cccc}, {c.q=ccc}, {d.s=ddddd}, {d.p=ddd}]

i want 'map of sortedmap' below using lambda expression

[{a=[{a.p=aa}, {a.q=aaa}, {a.r=aaaa}, {a.s=aaaaa}]},  {b=[{b.p=bb}, {b.r=bbbb}]},  {c=[{c.q=ccc}, {c.r=cccc}]},  {d=[{d.p=aaaaa}, {d.s=ddddd}]}] 

supplier<sortedmap<string, string>> supplier = new supplier<sortedmap<string, string>>() {          @override         public sortedmap<string, string> get() {             return new treemap<string, string>((a, b) -> a.compareto(b));         }     };      // [{a.p=aa}, {a.r=aaaa}, {a.q=aaa}, {a.s=aaaaa}, {b.p=bb}, {b.r=bbbb}, {c.r=cccc}, {c.q=ccc}, {d.s=ddddd}, {d.p=ddd}]     map<string, string> map = new hashmap<string, string>();     map.put("a.p", "aa");     map.put("a.r", "aaaa");     map.put("a.q", "aaa");     map.put("a.s", "aaaaa");     map.put("b.p", "bb");     map.put("b.r", "bbbb");     map.put("c.r", "cccc");     map.put("c.q", "ccc");     map.put("d.s", "ddddd");     map.put("d.p", "aaaa");      map<string, sortedmap<string, string>> collect = map             .entryset()             .stream()             .collect(                     collectors.groupingby((k -> k.getkey().substring(0, k.getkey().indexof('.'))),                             collectors.tomap(k -> ((entry<string, string>) k).getkey(), k -> ((entry<string, string>) k).getvalue(), (a, b) -> a, supplier)));

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