how to map the state as a key and cities as a list from the given .txt file using collection Map<String,List<String>> in java?

See more:

Java

collections

In given project cityStateLocator you will find a StateCity.txt file write a code to maintain the state and city data
from file. there are multiple occurences of the same state. for example

Maharashtra-Mumbai
Maharashtra-Nagpur
Goa-panji
Karnatka-banglore

in such scenario threre should be single occurence of state as a key and multiple cities should be stored in
the list as values

import java.io.*;
import java.util.*;

import com.exception.CityNotFoundException;
import com.exception.InvalidStateException;


 
public class DataManagerImpl implements DataManager {

    public Map<string,>> populateCityDataMap(String fileName)
    throws FileNotFoundException {
        Map<string,>> mlist=new HashMap<string,>>();
        List<string> list=new ArrayList<string>();
        BufferedReader in=new BufferedReader(new FileReader(fileName));
        String str,str2;
        try {
            while((str=in.readLine())!=null){
                String[] dataArray=str.split("-");
                String masterState="";
                masterState=dataArray[0];
                //System.out.println(masterState);
                int i=0;
                if((str2=in.readLine())!=null){
                    String[] dataArray2=str2.split("-");
                    String city=dataArray2[1];
                    if(masterState.equals(dataArray2[0])){
                    	list.add(city);
                    }
                }
                i++;
                mlist.put(masterState, list);
                //list.clear();
                
            }
                
        }
        catch (IOException e) {		
            e.printStackTrace();
        }
        return mlist;
    }
        
    public List<string> getCities(Map<string,>> stateCityMap,
    String state) throws InvalidStateException {
    
        return null;
    }