java 8 - Collect a List from another List in Java8 using streams -


i have list of objects. want move through list , collect few objects need , create list of objects. how can achieve in java8.

i start transactions.gettransactions() returns arraylist. now, want create list of transactions using t.getid(), t.getname(), t.getdate(). how can make null checks objects t.getotheraccount().getholder().getcountrerpartyname() efficiently..

    transrolist.addall(trans.stream().filter(t -> t.getdetails().gettransactiontype() != null)             .filter(t -> t.getdetails().gettransactiontype().equals(type))             .map(t -> {         transactionsro ro = new transactionsro();         ro.setid(t.getid());         ro.setaccountid(t.getthisaccount().getaccountid());         ro.setcounterpartyaccount(t.getotheraccount().getcounterpartyaccount());         ro.setcounterpartylogopath(t.getmetadata() != null ? t.getmetadata().getcounterpartylogopath() : null);         ro.setcounterpartyname(t.getotheraccount().getholder().getcounterpartyname());         ro.setdescription(t.getdetails().getdescription());         ro.setinstructedamount(t.getdetails().getvalue().gettransactionamount());         ro.setinstructedcurrency(t.getdetails().getvalue().gettransactioncurrency());         ro.settransactionamount(t.getdetails().getnewbalance() !=null ? t.getdetails().getvalue().gettransactionamount() : null);         ro.settransactioncurrency(t.getdetails().getnewbalance() !=null ? t.getdetails().getvalue().gettransactioncurrency() : null);         ro.settransactiontype(t.getdetails().gettransactiontype());         return ro;     }).collect(collectors.tolist()));


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