CODEWITHSUNDEEP
java
Amar
Amar

Reputation: 971

Search for a specific pattern in a hash map

I have the below snippet.I need to find out if there is any key in the map with pattern searching with discount.Help appreciate.

public class MapStringSearch {

    public static void main(String[] args) {

        Map test = new HashMap();
        test.put("discount.1", 1);
        test.put("discount.2", 2);
        test.put("discount.3", 3);
        test.put("voucher.4", 4);

    }

}

Upvotes: 0

Views: 91

Answers (4)

agad
agad

Reputation: 2189

I would use SortedMap instead of HashMap and check if tailMap("discount").firstKey().stratsWith("discount")

Upvotes: 0

Emanuel
Emanuel

Reputation: 8106

Iterator it = test.entrySet().iterator();
while (it.hasNext()) {
    Map.Entry pairs = (Map.Entry)it.next();
    System.out.println(pairs.getKey().toLowerCase().contains("YourString"))
}

Upvotes: 1

inigoD
inigoD

Reputation: 1741

I tend to do this way:

discount.put("1", 1);
discount.put("2", 2);
discount.put("3", 3);

test.put("discounts", discount);

So to find discounts:

test.get("discounts");

And after of this you can iterate with keyset (or entryset) or find concrete discounts with get...

You can iterate the keyset, sure, but honestly; I would redefine de data scheme of my application in order to not have "something.[0-9]" elements in a hashmap.

Upvotes: 0

Keval Trivedi
Keval Trivedi

Reputation: 1300

One of the way is :

for ( String key : test.keySet() ) {
    if(key.contains("discount"))
      // do something...
    else
      // do something...
}

Upvotes: 1

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