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  1. //package org.JavaIncloud.java;
  2.  
  3. import java.util.HashMap;
  4. import java.util.Map;
  5. import java.util.Map.Entry;
  6.  
  7. public class CommonOpetationWithMap 
  8. {
  9. 	public static void main(String...JavaInCloud)
  10. 	{
  11. 		/*create an HashMap(a class implements Map) and assign to a Map as we can not create object for Map interface*/
  12. 		Map<Integer, String> dataBases	=	new HashMap<Integer, String>();
  13.  
  14. 		//Store some dataBases name to the collection of dataBases object
  15. 		dataBases.put(100, "Oracle"); dataBases.put(101, "MySQL");   dataBases.put(102, "Teradata");	  
  16. 		dataBases.put(103, "Sybase"); dataBases.put(104, "MongoDB"); dataBases.put(105, "DB2");
  17. 		dataBases.put(106, "SQLite"); dataBases.put(107, "Derby");   dataBases.put(108, "SQL-Server");
  18. 		//Duplicate key(108) is not allowing simply it'll ignore and over write by Openbase. 
  19. 		dataBases.put(108, "Openbase"); 
  20. 		//You can duplicate the value(here Derby) for HashMap
  21. 		dataBases.put(109,"Derby");   
  22.  
  23. 		System.out.println(dataBases);
  24. 		//{102=Teradata,103=Sybase,100=Oracle,101=MySQL,108=Openbase,109=Derby,106=SQLite,107=Derby,104=MongoDB,105=DB2}
  25.  
  26. 		//Print the key for value Derby if and only if map is not empty and it contain value Derby otherwise don't go inside
  27. 		if(!dataBases.isEmpty() && dataBases.containsValue("Derby"))
  28. 		{
  29. 			System.out.println("Size of dataBases>>"+dataBases.size());//10
  30. 			for (Entry<Integer, String> dataBase : dataBases.entrySet()) 
  31. 			{
  32. 		        if ("Derby".equals(dataBase.getValue())) 
  33. 		        {
  34. 		        	int key	=	dataBase.getKey(); //auto unboxing from Integer to int
  35. 		            System.out.print(key+" ");
  36. 		        }
  37. 		        //109 107  
  38. 		        //N.B: As with value "Derby" two key is associated hence it is printing 109 and 107
  39. 		    }
  40. 		}
  41. 	}
  42. }
  43.  
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
Main.java:7: error: class CommonOpetationWithMap is public, should be declared in a file named CommonOpetationWithMap.java
public class CommonOpetationWithMap 
       ^
1 error
stdout
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Standard output is empty
https://ideone.com/m3DxnZ
language:
Java (HotSpot 12)
created:
10 years ago
visibility:
public

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