Split string into parts in java to put it in a map

I have been trying to get all the values from a string and put them in a map in the following manner:

So I have a string which is like this:

String cookies = "i=lol;haha=noice;df3=ddtb;"

So far I have been trying this out:

final Map<String, String> map = new HashMap<>();
map.put(cookies.split(";")[0].split("=")[0], cookies.split(";")[0].split("=")[1]);

But this way I can only put one value in and it is quite long and ugly. Is there any was to due this with regex or a loop?

You could use a loop to iterate over the key value pairs and put them into the map:

String[] cookieArr = cookies.split(";");
for(String cookieString : cookieArr){
  String[] pair = cookieString.split("=");
  if(pair.length < 2){
    continue;
  }
  map.put(pair[0], pair[1]);
}

The if is only there to prevent ArrayIndexOutOfBounds expcetions if cookie string is malformed

an alternativ would be using a stream:

Arrays.stream(cookies.split(";")).forEach(cookieStr -> map.put(cookieStr.split("=")[0], cookieStr.split("=")[1]));

As mentioned by @WJS in the comment, you could use map.putIfAbsent(key, vlaue) instead of map.put(key, value) to prevent overriding of values. But in case of cookies it could be a desired behavior to overwrite the old value with the new.

You could do it like this. It presumes your format is consistent.

• first splits each k/v pair on ";"
• the splits on "=" into key and value.
• and adds to map.
• if duplicate keys show up, the first one encountered takes precedence (if you want the latest value for a duplicate key then use (a, b)-> b as the merge lambda.)

String cookies = "i=lol;haha=noice;df3=ddtb";
Map<String, String> map = Arrays.stream(cookies.split(";"))
		.map(str -> str.split("=")).collect(Collectors
				.toMap(a -> a[0], a->a[1], (a, b) -> a));
map.entrySet().forEach(System.out::println);

Prints

df3=ddtb
haha=noice
i=lol


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