lambda - Java8 how to use stream map with multiple fields -

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i have pojo looks this:

public class record {     private string description;     private int score;     private int multiple;     // more data members     // usual getters , setters }  public class mykey {     private string description;     private int score;     // usual getters , setters }    record [] records= {     new record (1/*score*/, "jack"),     new record (2, "smith"),     new record (12, "jill") }; list<record > list = arrays.aslist(records); // trying create map based on  // part dont know how // how create map of key  // description , score , make map map<key, list<record>> map =     list.stream()     .map(/*how write lambda or function here*/)     .foreach(get());

how create map mykey key , record being data portion of map?

you use collect groupingby-collector:

record [] records= {     new record (1/*score*/, "jack"),     new record (2, "smith"),     new record (12, "jill") };  map<key, list<record>> map = arrays.stream(records)     .collect(collectors.groupingby(         record -> new key(record.getscore(), record.getdescription())     ));

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