问题
I've been looking over the internet but I cant seem to find this answer. I have a hashmap:
public Map<String, Integer> killstreaks = new HashMap<String, Integer>();
Now I want to call the second value, the integer. SO by using the string as a reference, I know I can do this:
killstreaks.get(//idk)
I just need to get my head around on how to get the second value so I can use it to use a formula to work out a value to reward the player.
How it works is that the player kills someone and I store it in this, the player name and the streak they are on, as they kill I add 1 to the streak. When they kill someone I want to give them money according to their streak so I want to use the integer compared to the name, so if I provide the name, it gives the corresponding int, how do I get that? Thanks!
回答1:
This is how you can iterate over your Map:
for (Map.Entry<String, Integer> entry : killstreaks.entrySet()) {
String key = entry.getKey();
Integer value = entry.getValue();
// continue here
}
To get a specific value (Integer) from your Map use:
killstreak.get("yourKey");
Seeing from your comment that you want to increment entries by 1, you can use:
killstreaks.put(key, killstreaks.get(key) + 1);
And as I see you are using Java 8 you can even use the nicer getOrDefault:
killstreaks.put(key, killstreaks.getOrDefault(key, 0) + 1);
来源：https://stackoverflow.com/questions/35405106/java-get-hashmap-value