public class mysetcollectorimplements collector,set>
@override
public biconsumer, t> accumulator
() @override
public binaryoperator> combiner
() ;
}@override
public function, set> finisher
() @override
public setcharacteristics
() public static void main(string args)
}複製**
public class mysetcollector2implements collector,map>
@override
public biconsumer, t> accumulator
() @override
public binaryoperator> combiner
() ;
}@override
public function,map> finisher
() ;
}@override
public setcharacteristics
() public static void main(string args)
}複製**
listlist = arrays.aslist("hello","world","welcome","hello","a","b","c","d","e","f","g")
setset = new hashset<>();
set.addall(list);
system.out.println("set:"+set);
mapmap = set.stream().collect(new mysetcollector2<>());
system.out.println(map);
複製**
concurent:多個執行緒同時操作乙個結果容器，不需要使用combiner 如果不加這個屬性，parallelstream可以多個執行緒操作多個中間容器 最終由combiner函式合併多個中間容器
java8求質數的收集器
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