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Java Generating All Key Value Pairs From List
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Mar 20, 2018 Spring Cache is nothing but a store of key-value pairs, where values are the ones returned from @Cacheable methods, whereas, for keys there has to be some strategy to generate them. By default Spring uses a simple key generation based on the following algorithm: If @Cacheable method has no arguments then SimpleKey.EMPTY is used as key. All you have to do is give the position in the array where the item is that you want removed. This removes the 0th element in the array (that means the first element in Java, remember!). If the item was in the middle of the list, the list automatically shortens itself so there is no gap in your data. Pretty neat stuff huh?
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The Map class’s object contains key and value pairs. You can convert it into two list objects one which contains key values and the one which contains map values separately.
I realize that this question may be borderline bannable because it's asking for suggestions on tools, but it will really help newbies. This online tool allowed me to play around with hashes and to really understand them at a deeper level:I can't find a similar tool (that works) for ECDSA cryptography where I can play around with public and private keys, and do digital signatures on messages, and test signature verification.I've found these 2 sites that claim to do this but didn't work for me:.Thoughts?
To convert a map to list −
- Create a Map object.
- Using the put() method insert elements to it as key, value pairs
- Create an ArrayList of integer type to hold the keys of the map. In its constructor call the method keySet() of the Map class.
- Create an ArrayList of String type to hold the values of the map. In its constructor call the method values() of the Map class.
- Print the contents of both lists.
Example
Output
Java Generating All Key Value Pairs From Listing
Java Generating All Key Value Pairs From Listings
9.48.Hashtable Basics | ||||
9.48.1. | Creating Hash Tables | |||
9.48.2. | Adding Key-Value Pairs | |||
9.48.3. | Get all keys and elements from a hash table | |||
9.48.4. | Copying all the key-value pairs from one Hashtable (or any Map) into another Hashtable: the putAll() method | |||
9.48.5. | Displaying Hash Table Contents | |||
9.48.6. | Removing Key-Value Pairs: call the remove() method with the specific key as its argument | |||
9.48.7. | To get rid of all key-value pairs: call the clear() method | |||
9.48.8. | Sizing Hash Tables | |||
9.48.9. | Fetching Keys and Values: the get() method | |||
9.48.10. | To perform some operation on all keys: the keys() or keySet() methods | |||
9.48.11. | Using the elements() or the values() method to get the set of all the values in the hash table | |||
9.48.12. | Getting elements (key-value pairs) from a Hashtable: the entrySet() method | |||
9.48.13. | Finding Elements | |||
9.48.14. | contains() and containsValue(): check to see if a specific value is found within the Hashtable | |||
9.48.15. | Cloning Hash Tables | |||
9.48.16. | Hashtable Immutability: to make the table read-only using Collections.unmodifiableMap(Map map) | |||
9.48.17. | Counting Word Occurrences with a hash table | |||
9.48.18. | uses a generic Hashtable to store the names of bank depositors and their current balances | |||
9.48.19. | Check if a particular key exists in Java Hashtable | |||
9.48.20. | Check if a particular value exists in Java Hashtable | |||
9.48.21. | Iterate through keys of Java Hashtable | |||
9.48.22. | Iterate through values of Java Hashtable | |||
9.48.23. | Remove all values from Java Hashtable | |||
9.48.24. | Remove value from Java Hashtable | |||
9.48.25. | Get Collection of Values from Hashtable | |||
9.48.26. | Get Set view of Keys from Hashtable | |||
9.48.27. | Scan the content of a hashtable | |||
9.48.28. | Sort keys in an Hashtable | |||
9.48.29. | Use iterators with a Hashtable. |