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Which of the following is a valid type that can be used as a key in a map?
Map keys and values can be of any data type—primitive types, collections, sObjects, user-defined types, and built-in Apex types.
How do I know if a map contains a key apex?
BillingCity);
- containsKey(key) Returns true if the map contains a mapping for the specified key.
- get(key) Returns the value to which the specified key is mapped, or null if the map contains no value for this key.
- isEmpty()
- keySet()
- put(key, value)
- putAll(fromMap)
- remove(key)
- size()
Is Map a collection in Java?
Because a Map is not a true collection, its characteristics and behaviors are different than the other collections like List or Set. A Map cannot contain duplicate keys and each key can map to at most one value.
How to create map [ string code, string ID ] in apex?
If i run following query then i will have to iterate over rateMap map to create Map . Is there any other efficient way to get this kind of result directly using soql OR by doing minimal manipulations in apex code ?
Can a map be keyed from a company name?
The created map always has Id as the key, so you won’t be able to lookup company name in there. If you want a mapped keyed from company name, you’ll need to construct it yourself. Not the answer you’re looking for?
When do you need to use hashCode in apex?
If two objects are equal, based on the equals method, hashCode must return the same value. If two objects are unequal, based on the result of the equals method, it is not required that hashCode return distinct values. The hashCode method in Apex is based on the hashCode method in Java.
How to create a map from a soql query?
The code below would be the simplest way to do it using a for each loop. It will stop you hitting a heap size limit if you are iterating over a lot of records, which you could potentially be doing as there is no where condition on your SOQL.