Help with things

Hi, i have been starting on coding plugins and i would like to know what HashMap means and what Itnerator(idk if its this) means too

 

A HashMap is a collection of objects (like a List), where each element has a corresponding key to it: for example, if I wanted to store a separate integer score per player, I would use a HashMap. The syntax is <key type, value type>, which in this case will be String (player name) and Integer (for their score) - don't use primitive data types like int/boolean/double, use Integer/Boolean,Double:

Code:

HashMap<String, Integer> scores = new HashMap<String, Integer>();

Add a player and his score:

Code:

scores.put("Chinwe", 0);
scores.put("Pik0", 5);
scores.put("Player", 10);

Get a player's score:

Code:

int chinwesScore = scores.get("Chinwe");

An iterator is used for looping through every key/value in a Map, although you can use an enhanced for loop too:

Code:

// for loop
for (String name : scores.keySet())
{
    // loops through "Chinwe", "Pik0" and "Player"
}
 
for (int score : scores.values())
{
    // loops through 0, 5 and 10
}

Iterators are used like this:

Code:

// make a new iterator, which takes the type of object it will be looping through
// in this case, <String>
Iterator<String> iterator = scores.keySet().iterator();
 
// it will loop as long as there are still keys to loop through
while (iterator.hasNext())
{
    String name = iterator.next(); // gets the next name
    // do your stuff
}

 

Chinwe thanks : )

 

Hah, you're bad at this game, only 0 points? NOOB!

Nawh I kid, but Pik0 set this thread to Solved please.