CODEWITHSUNDEEP
java
Shaun Wild
Shaun Wild

Reputation: 1243

How to use Hashmaps for key bindings?

I am making a basic little game in Java and I want to have it so that I can use Hashmaps for binding keys..

e.g.- it would be like HashMap and then I would do: hashmap.add(Keys.up, VK_UP);

but this is where I get to my problem, How do i access the hashmap and choose which keys are pressed when the KeyListener returns a pressed key?

Sorry if this question seems baffling but I'm really confused too..

Upvotes: 1

Views: 296

Answers (2)

giorashc
giorashc

Reputation: 13713

Since all key types for KeyEvent are of type int use the following hash map :

HashMap<Integer, Boolean> keysState = new HashMap<Integer, Boolean>();

.
.
.

public void keyPressed(KeyEvent e) {
  keysState.put(e.getKeyCode(), true);
}

public void keyReleased(KeyEvent e) {
  keysState.put(e.getKeyCode(), false);
}

and now you can test if a key is pressed by :

if (keysState.get(KeyEvent.VK_UP)) {
   // Up key is pressed so do the desired action
}

Upvotes: 1

amit
amit

Reputation: 178491

You insert key and value to the hashmap using map.put(key,value) and retrieves a value based on a key using map.get(key)

You need to make sure that the class of the keys overrides both hashCode() and equals() [For library classes - it already is]

Upvotes: 1

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