CODEWITHSUNDEEP
javadictionarycollections
greenTree
greenTree

Reputation: 305

Can I override a Map<Integer, Integer> with Map<String, Integer>?

I have the following class AccountWebappGridRow, which extends AccountGridRow:

public class AccountWebappGridRow<Accounts> extends AccountGridRow implements java.io.Serializable {

AccountGridRow contains has this field:

private Map<Integer, Integer> balances;

With public getters/setters:

public Map<Integer, Integer> getBalances() {
  return balances;
}

public void setBalances(Map<Integer, Integer> balances) {
   this.balances = balances;
}

Is there a way that I can somehow override/replace the inherited 

private Map<Integer, Integer> balances;

in my AccountWebappGridRow...with this instead:

private Map<String, Integer> balances;

Upvotes: 1

Views: 1079

Answers (2)

ΦXocę 웃 Пepe&#250;pa ツ
ΦXocę 웃 Пepe&#250;pa ツ

Reputation: 48258

you can define a method that using stream turn the Map<Integer, Integer> into a Map<String, Integer>

public Map<String, Integer> getBalancesStringString() {
    return balances.entrySet()
            .stream()
            .collect(Collectors.toMap(e -> e.toString(), e -> e.getValue()));
}

Upvotes: 1

GhostCat
GhostCat

Reputation: 140457

Sure. You can do that ... as soon as you can provide a mapping that will allow you to turn an Integer key into a String key.

In other words: your class knows about Integer keys and values. Of course you can now add another map that uses the same values. The only thing required is that you create a meaningful mapping function. Meaningful meaning: a function that fits your requirements. We don't know what content the Map<String, Integer> is supposed to hold; so we can't tell you how to properly map keys here!

The most simple answer could be to use 

String stringKey = someIntegerKey.toString();

resp.

Integer integerKey = Integer.parseString(stringKey);

With those mappings you can now take the internal map and create a "result" map that uses Integers again.

In other words: you can add that new map to your class; or you can completely rework your class and change that balances field to use a different key. All of that is just "work" - and all of that relies on you defining how you get from Integer to String keys; and vice versa.

Upvotes: 3

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