stream is not storing value but it convey,it lazy load and iterate all value once
it doesn't modify it's source
*function

allMatch(n->n/3==0)-it will return true if all conditon is true
count()- it return the count
distinct()-it return unqu value from stream
max(Compatetor.compare(Emplyoee:getAge));
limit(5) -makes sure use  Stream.iterate(0, n -> n + 2); Stream.limit(3).collect(Collectors.toList())
sorted()

it have StringJoiner class where u join multiple string using , - and other option also provided
function:-

          add(null(bydefault)
          merge(new StringJoiner(,));-make sure create stringJoiner to store new string joiner
          length();
          setEmptyValue("default value if string is null");

StringJoiner str=new StringJoiner(",","[","]");- here firts one one diveed and second is prefix,3rd one is suffix
str.toString()-to make stringJoiner to string
example [ java8Note/StringJoiner.java ]

Arrays.parallelSort(referance of an arrays,first index,last index)-it will sort based on index Character.isUpperCase(str.charAt(1))-it have character class