/******************************************************************************
Online Java Compiler.
Code, Compile, Run and Debug java program online.
Write your code in this editor and press "Run" button to execute it.
*******************************************************************************/
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Main
{
public static void main(String[] args) {
String str = "{0=>[name:'data1',phone:'123',shipping:'location1'], \n" +
"1=>[name:'data1',phone:'456',shipping:'location2'], \n" +
"2=>[name:'data1',phone:'678',shipping:'location3'], \n" +
"3=>[name:'data2',phone:'222',shipping:'location4'], \n" +
"4=>[name:'data2',phone:'111',shipping:'location5'], \n" +
"5=>[name:'data3',phone:'555',shipping:'location6']}";
HashMap<String,List<String>> result = new HashMap<String,List<String>>();
for (String string : str.split("=>")) {
String s = string;
Pattern p = Pattern.compile("\\[.*?\\]");
Matcher m = p.matcher(s);
if(m.find()) {
String element = (String) m.group().subSequence(1, m.group().length()-1);
String key = element.split(":")[1].split(",")[0].replaceAll("'", "");// I am assuming you are not using any serialization API
if(result.get(key) == null) {
List<String> val=new ArrayList<String>();
val.add(element);
result.put(key, val);
}else {
List<String> values= result.get(key);
values.add(element);
}
}
}
result.forEach((k,v)->{
System.out.println(k+" => "+v );
});
}
}
