Split String In JAVA by specific words

Question

String S= \"multiply 3 add add 3 3 1\"

I want to get two string arrays The one is {\"multiply\", \"add\", \"add\"} Another out is {\"3\",\"3\",\"3\",1}

How can I

Answer 1

You can use java 8 groupingBy.

Map> map = Arrays
    .stream(s.split(" "))
    .collect(Collectors.groupingBy(e -> e.matches("\\d+")));

System.out.println(map);

The result is:

{false=[multiply, add, add], true=[3, 3, 3, 1]}

You can get operators and operands by:

List operators = map.get(false);
List operands = map.get(true);