How to convert string into map having value as a comma separated list? [on hold]

Question

I have a string in the format - "[21:[1,2,3],22:[1,2,3]]". How am I supposed to convert this into a key-value map having list as a value?

Answer 1

1.Remove the [ and ] at the beginning and end. 21:[1,2,3],22:[1,2,3]

2.Do a string split for ],

3. For each element, String split again for:[.

   First element is your Map key Second element (comma separated) can be converted to list using array conversion

Answer 2

1. Remove square bracket( [ ) removeAll("\\[","")
2. Remove last square bracket( ] ,") together with trailing comma( , ) and replace with full-colon( : ) removeAll("\\[",":")
3. Replace double square brackets at the end of String removeAll("\\]]","")
4. Split the remaining String using split(":")

5. Then loop

   String x = "[21:[1,2,3],22:[1,2,3]]"; final HashMap<String,List<String>> test = new HashMap<>(); final String s = x.replaceAll("\\[", "").replaceAll("\\],", ":"). replaceAll("\\]]", ""); final String[] split = s.split(":"); for(int i =0;i<split.length;i++) test.put(split[i],Arrays.asList(split[++i])); test.forEach((k,v)-> System.out.println(k +" " +v))

Result

Answer 3

Some straight forward groovy:

String s = "[21:[1,2,3],22:[1,2,3],23:[6:[1,2],7:[3,4]]]"
Map res = Eval.me s

assert [1,2,3] == res[22]
assert [3,4] == res[23][7]