java - Merging Arraylist of Objects and removing duplicates based on a field value -

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i looking best solution below requirements.

i have class similar classa below

public class classa {     protected list<classa.plana> plana;      public list<classa.plana> getpriceplan() {         if (plana == null)             plana = new arraylist<classa.plana>();         return this.plana;     }      public static class plana {         protected string code;         protected xmlgregoriancalendar startdate;         protected xmlgregoriancalendar enddate;          // getters , setters above fields     }    }

and have 2 objects (obj1, ojb2) of classa. requirement merge 2 objects , remove duplicates.

example:

classa obj1=[plana =[code=aaa, startdate=2010/12/10, enddate=2011/12/10], plana =[code=bbb, startdate=2010/12/10 enddate=<null>]]   classa obj2=[plana=[code=aaa, startdate=2011/12/10], plana= [code=cc, startdate=2011/12/10 enddate=<null>], plana= [code=bbb, startdate=2010/12/10 enddate=2011/12/10]]

after merging result should like:

classa obj3=[plana[code=aaa, startdate=2011/12/10], plana= [code=cc, startdate=2011/12/10 enddate=<null>],plana= [code=bbb, startdate=2010/12/10 enddate=<null>]}

implement equals , hashcode plana:

public static class plana {      protected string code;     protected xmlgregoriancalendar startdate;     protected xmlgregoriancalendar enddate;      @override     public boolean equals(object obj) {         return obj instanceof plana && obj.hashcode() == hashcode();     }      @override     public int hashcode() {         return arrays.hashcode(new object[] { code, startdate, enddate });     }  }

then use set:

set<classa.plana> merged = new hashset<classa.plana>(); merged.addall(obj1.getpriceplan()); merged.addall(obj2.getpriceplan());

a set automatically removes duplicates.


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