Program to form a HashMap out of given String

For example:
Input : name=ashish&age=24&company=kyubatau&city=pune
output : a HashMap containing LHS values as Keys and RHS values as Values

//Program to form a HashMap out of given String 

//O(n)

//Program to form a HashMap out of given String 
//O(n)

import java.util.*;

public class StringMap{
static public void main(String args[]){
System.out.println(new StringMap().getStringMap("name=ashish&age=24&company=kyubatau&city=pune"));
}

public HashMap<String,String> getStringMap(String str){

String flag = "key";
String myKey = "", myVal = "";
HashMap<String,String> pairs = new HashMap<>();


for(int i=0 ;  i<str.length()  ;  i++)
{
String curr = String.valueOf(str.charAt(i));


if(curr.equals("=" ))
{
flag = "value";
continue;
}

if(curr.equals("&"))
{
pairs.put(myKey,myVal);
flag = "key";
myKey = "";
myVal = "";
continue;
}

if(flag.equals("key"))
myKey = myKey + str.charAt(i);
else
if(flag.equals("value"))
myVal = myVal + str.charAt(i);
}

pairs.put(myKey,myVal);

return pairs;
}
}


output:

{city=pune, name=ashish, company=kyubatau, age=24}