Salesforce and Apex HashMap examples HashMap1 Example Code. Iterate through the HashMap Pair( 2, two ), key = 2, value = two Pair( 4, four ), key = 4, value = four Demonstrate access. HashMap examples; Hashmap Internal Implementation Analysis in Java. What is HashMap; About Me. Get(key) Returns the value to which the specified key is mapped, or null if the map contains no value for this key. GetSObjectType Returns the token of the sObject type that makes up the map values. HashCode Returns the hashcode corresponding to this map.
Get a key from value with an HashMap
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1. | Creating and storing arrays in a map |
2. | Sort based on the values |
3. | Retrieve environment variables (JDK1.5) |
4. | Creating a Type-Specific Map: creates a map whose keys are Integer objects and values are String objects. |
5. | A map declared to hold objects of a type T can also hold objects that extend from T |
6. | A value retrieved from a type-specific collection does not need to be casted |
7. | Map techniques. |
8. | Create an array containing the keys in a map |
9. | Create an array containing the values in a map |
10. | Creating a Hash Table |
11. | Creating a Map That Retains Order-of-Insertion |
12. | Automatically Removing an Unreferenced Element from a Hash Table |
13. | Creating a Type-Specific Map [5.0] |
14. | Use Iterator to loop through the HashMap class |
15. | Create type specific collections |
16. | Convert Properties into Map |
17. | A java.util.Map implementation using reference values |
18. | Utility method that return a String representation of a map. The elements will be represented as 'key = value' |
19. | Utility method that return a String representation of a map. The elements will be represented as 'key = value' (tab) |
20. | This program demonstrates the use of a map with key type String and value type Employee |
21. | Format a Map |
22. | A Map implementation that dumps its content when memory runs low. |
23. | A Map that stores the values in files within a directory. |
24. | Map List |
25. | Multi Value Map Array List |
26. | Multi Value Map Linked HashSet |
27. | An object that maps keys to values, and values back to keys. |
28. | LRU Map |
29. | A map acts like array. |
30. | Order Retaining Map |
31. | BinaryMap class implements a map from objects to integer objects where the only value is the integer with value 1. |
32. | A space-optimized map for associating char keys with values. |
33. | A Map implementation that grows to a fixed size and then retains only a fixed number of the highest (largest) keys. |
34. | Class which creates mapping between keys and a list of values. |
35. | A map of values by class. |
36. | History Map |
37. | Sorts map by values in ascending order. |
38. | Map from a given key to a list of values |
39. | Map from a given key to a set of values |
40. | Class which keeps a set of values and assigns each value a unique positive index. |
41. | Array Map |
42. | Array map |
43. | An ArrayMap is a very inefficient map type that is more robust in dealing with changes to its keys than other maps. |
44. | This Map stores it's keys as strings in upper case, null and duplicate keys are not allowed |
45. | Map to string |
46. | A simple class that stores key Strings as char[]'s in a hash table. |
Program to get value from HashMap when the key is provided.
Output:
Note: In the above program the key 5 is not mapped to any value so the get() method returned null, However you must not use this method for checking existence of a Key in HashMap because a return value of null does not necessarily indicate that the map contains no mapping for the key; it’s also possible that the map explicitly maps the key to null. You must use the containsKey() method for checking the existence of a Key in HashMap.
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