How to use HashMAps in Java ?

Question

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lakshmi priyaaka · Answer

HashMap can be used to store key-value pairs. But sometimes you may want to store multiple values for the same key. For example: For Key A you want to store - Apple Aeroplane For Key B you want to store - Bat Banana For Key C you want to store – Cat Car package com.skilledmonster.examples.util.map; 02. 03. import java.util.ArrayList; 04. import java.util.HashMap; 05. import java.util.List; 06. import java.util.Map; 07. 08. /** 09. * HashMap - Single Key and Multiple Values using List 10. * 11. * @author Jagadeesh Motamarri 12. * @version 1.0 13. */ 14. public class SingleKeyMultipleValueUsingList { 15. 16. public static void main(String[] args) { 17. 18. // create map to store 19. Map > map = new HashMap >(); 20. 21. // create list one and store values 22. List valSetOne = new ArrayList (); 23. valSetOne.add( Apple ); 24. valSetOne.add( Aeroplane ); 25. 26. // create list two and store values 27. List valSetTwo = new ArrayList (); 28. valSetTwo.add( Bat ); 29. valSetTwo.add( Banana ); 30. 31. // create list three and store values 32. List valSetThree = new ArrayList (); 33. valSetThree.add( Cat ); 34. valSetThree.add( Car ); 35. 36. // put values into map 37. map.put( A  valSetOne); 38. map.put( B  valSetTwo); 39. map.put( C  valSetThree); 40. 41. // iterate and display values 42. System.out.println( Fetching Keys and corresponding [Multiple] Values n ); 43. for (Map.Entry > entry : map.entrySet()) { 44. String key = entry.getKey(); 45. List values = entry.getValue(); 46. System.out.println( Key =  + key); 47. System.out.println( Values =  + values + n ); 48. } 49. } 50. }