Java Tutorials

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 ?