Java Maps How-Tos

The following is a list of tutorials covering how-to topics on Maps category in Java language. Each tutorial covers the answer for the how-to question, and a set of working examples to demonstrate the solution.

1. How to create an Empty Map in Java ?
2. How to create a Map with Initial Key-Value Pairs in Java ?
3. How to Print a Map in Java ?
4. How to Add a Key-Value Pair to a Map in Java ?
5. How to Set a Default Value for a Key in a Map in Java ?
6. How to Update the Value for a Key in a Map in Java ?
7. How to Check if a Map is Empty in Java ?
8. How to Check if a Key Exists in a Map in Java ?
9. How to Check if a Value Exists in a Map in Java ?
10. How to Get the Value Associated with a Key in a Map in Java ?
11. How to Remove a Key-Value Pair from a Map in Java ?
12. How to Remove Key-Value Pairs from a Map Based on Values in Java ?
13. How to Clear All Key-Value Pairs from a Map in Java ?
14. How to Iterate Over Keys in a Map in Java ?
15. How to Iterate Over Values in a Map in Java ?
16. How to Iterate Over Entries (Key-Value Pairs) in a Map in Java ?
17. How to Get the Size (Number of Key-Value Pairs) of a Map in Java ?
18. How to Convert a Map to an Array of Keys in Java ?
19. How to Convert a Map to an Array of Values in Java ?
20. How to Merge Two Maps in Java ?
21. How to Copy a Map in Java ?
22. How to Check if Two Maps are Equal in Java ?
23. How to Sort a Map by Keys in Java ?
24. How to Sort a Map by Values in Java ?
25. How to Filter a Map Based on Keys in Java ?
26. How to Filter a Map Based on Values in Java ?
27. How to Reduce Values in a Map to a Single Value in Java ?
28. How to Convert an Array of Key-Value Pairs to a Map in Java ?
29. How to Convert a Map to a JSON String in Java ?
30. How to Convert a JSON String to a Map in Java ?
31. How to Swap Keys and Values in a Map in Java ?
32. How to Create a Map of Maps in Java ?
33. How to Iterate Over a Map of Maps in Java ?