CODEWITHSUNDEEP
javaslick2d
Patrick Reck
Patrick Reck

Reputation: 303

Checking on multiple values in array

I'm currently trying to make a small chatgame in the Slick2d framework. The framework's got a method called

isKeyPressed()

and a whole long list of variables i can use to check. For instance:

input.KEY_A

Currently the only way i can register a letter, is by having a whole list of those checkers:

if (input.isKeyPressed(input.KEY_A)) {
    this.text += "a";
}
if (input.isKeyPressed(input.KEY_B)) {
    this.text += "b";
}
if (input.isKeyPressed(input.KEY_C)) {
    this.text += "c";
}

Is there any smarter way i can do this?

I could imagine i would be able to store the input.KEYS in an array in some way, but i'm not sure if that is a proper way, and even how to implement it.

Upvotes: 1

Views: 105

Answers (2)

assylias
assylias

Reputation: 328598

You could use a HashMap to store the mapping (!) - Assuming the KEY_XX are integers, for example, it could look like this:

private static final Map<Integer, String> mapping = new HashMap<Integer, String> () {{
    put(input.KEY_A, "a");
    put(input.KEY_B, "b");
    //etc
}};


for (Map.Entry<Integer, String> entry : mapping.entrySet()) {
    if (input.isKeyPressed(entry.getKey()) this.text += entry.getValue();
}

The map can be made static if it is always the same so you only need to populate it once.
Note: this could be more efficient if you had an input.getKeyPressed() method or something similar.

Upvotes: 2

Mik378
Mik378

Reputation: 22171

 Map<Integer,Character> keyWithLetterMap = new HashMap<Integer,Character>();
 //populates initially the map, for instance: keyWithLetterMap.put(input.KEY_A, 'a');

 for (Map.Entry<Integer, Character> keyWithLetter : keyWithLetterMap.entrySet()) {
     if(input.isKeyPressed(keyWithLetter.getKey())) 
        this.text += keyWithLetter.getValue();
 }

Otherwise, and even better way, use enum instead of Map ;)

Upvotes: 1

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